{"id":7729,"date":"2026-05-30T15:01:00","date_gmt":"2026-05-30T07:01:00","guid":{"rendered":"https:\/\/www.sprintpcbgroup.com\/?p=7729"},"modified":"2026-05-30T13:39:46","modified_gmt":"2026-05-30T05:39:46","slug":"pcb-potting-board-cracking-blistering-causes","status":"publish","type":"post","link":"https:\/\/www.sprintpcbgroup.com\/ja\/blogs\/pcb-potting-board-cracking-blistering-causes\/","title":{"rendered":"Common Pitfalls in PCB Potting: Why Your Circuit Boards Keep Cracking and Blistering"},"content":{"rendered":"
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Watching this newly finished circuit board slowly being enveloped by a layer of transparent encapsulant, I suddenly found the process quite fascinating. Many people assume that PCB potting<\/a> is simply a matter of burying electronic components for protection; in reality, however, the intricacies involved are far more complex than one might imagine. I have seen numerous engineers select materials based solely on thermal conductivity or hardness specifications, only to find that the resulting potted boards either crack or develop blisters.<\/p>

I recall a previous project where we used a potting compound designed for high-temperature environments. Initial testing went off without a hitch. However, after the equipment was shipped to a client in the southern region, fine cracks began to appear along the edges of the potting layer within just three months. We later discovered that the material’s coefficient of thermal expansion did not match that of the circuit board. Under humid weather conditions\u2014characterized by repeated cycles of heating and cooling\u2014even the most robust encapsulant could not withstand the resulting internal stresses.<\/p>

Nowadays, some of the new materials entering the market are truly impressive. For instance, potting compounds featuring self-healing capabilities are particularly intriguing\u2014they can automatically repair themselves when microscopic cracks appear. Although they cost about 30% more than standard products, they are well worth the investment for equipment intended for long-term outdoor use. After all, no one wants to see an entire circuit board rendered useless simply because of a tiny crack.<\/p>

Lately, I have been experimenting with a technique known as “layered potting.” First, a flexible buffer layer is applied to the core chip area to protect sensitive components; next, the power device area is covered with a highly thermally conductive material; finally, a general protective coating is applied to the entire assembly. Although this adds two extra steps to the process, it allows us to specifically address the unique requirements of different components while avoiding the pitfalls of relying on a single material with insufficient performance across the board.<\/p>

In reality, the most easily overlooked aspect is the cleaning process performed before potting. I recall one instance where, in a rush to meet a tight deadline, we proceeded directly to potting without thoroughly cleaning off the flux residue. Three months later, the entire potting layer had turned a cloudy yellow. We later realized that the rosin components within the flux had slowly leached out over time.<\/p>

Ultimately, selecting the right potting solution is akin to tailoring a suit for a circuit board. One shouldn’t simply use a generic formula just to save money, nor should one blindly chase after high-end materials; the key lies in truly understanding the device’s operating environment and potential risks, thereby finding the optimal balance.<\/p>

Sometimes I find myself wondering: will we ever see “smart” potting materials in the future that can display their internal status in real-time? For instance, changing color to indicate the degree of aging, or integrating tiny sensors to monitor internal humidity levels\u2014how fascinating that would be!<\/p>

I\u2019ve seen far too many people oversimplify the concept of PCB potting. They often assume they can just pick a random material, pour it onto the board, and call it a day. In reality, it\u2019s much like cooking: if the “heat” (or curing conditions) isn’t right, even the finest ingredients go to waste.<\/p>

I once had a client come to me complaining about waterproofing issues with the mainboard of a precision instrument. The potting compound they had previously used cracked wide open when exposed to environments with significant temperature fluctuations, allowing moisture to seep right in. Upon disassembly, we discovered the problem lay in poor control over the curing rate: the surface had dried, but the interior remained in a semi-liquid state, creating internal stresses that eventually fractured the encapsulation.<\/p>

Truly reliable PCB protection should fit like a custom-tailored suit\u2014snug and form-fitting, yet never restrictive. For example, materials used for high-frequency circuits must possess a stable dielectric constant; otherwise, signal transmission becomes sluggish and distorted\u2014much like trying to run through a swamp.<\/p>

Nowadays, some engineers rely too heavily on datasheets; they panic over a mere 0.1-millimeter deviation in thickness, yet fail to realize that during actual application, subtle variations in the material’s self-leveling properties are often far more critical. I recall an instance while testing high-temperature-resistant materials: we placed a fully potted circuit board into an aging oven, only to discover that a resistor in one of the corners had started smoking. Upon dismantling the unit, we realized that air bubbles had accumulated in that specific spot, creating a thermal hotspot.<\/p>

It is precisely these minute details that determine success or failure; simply staring at a technical datasheet will never reveal the underlying issues.<\/p>

Material viscosity is another fascinating subject. If the compound is too thin, it tends to flow everywhere uncontrollably; conversely, if it is too thick, it fails to fully fill the crevices. Sometimes, depending on the board’s layout, a staged potting process is required\u2014filling the areas containing low-profile components first, and then covering the taller components.<\/p>

I recently encountered a low-temperature-curing material that is particularly well-suited for repair scenarios. A brief application of heat from a heat gun allows for its complete removal\u2014a stark contrast to the old days, when one would have to spend ages scraping away with a utility knife, often damaging the underlying copper traces in the process.<\/p>

What strikes me most, however, is the fact that many small-scale workshops still rely on manual mixing of potting compounds. They simply eyeball the mixture until it “looks about right” before pouring it onto the boards. Consequently, when problems arise, they have no way of knowing whether the fault lies in an incorrect mixing ratio or improper application technique. Truly, specialized tasks demand specialized tools.<\/p>

Whenever I examine the intricate internal architecture of complex electronic devices, a question invariably crosses my mind: Why do some products function flawlessly for eight or ten years, while others fail within less than a year? This reminds me of an old radio I once repaired; upon removing the back cover, I discovered that the internal circuit boards<\/a> were completely encased in a thick, gel-like substance. I later learned that this technique is known as “PCB Potting”\u2014the very encapsulation process we are discussing here.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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Many people\u2019s understanding of potting likely remains limited to the basic concept of simple filling and physical protection. However, I view it as akin to fitting an electronic device with a custom-tailored suit of protective armor. This “suit” must not only fit perfectly but also be capable of withstanding a wide range of extreme environmental conditions\u2014whether it be the high humidity of southern climates or the bitter cold of northern winters. I once helped a friend repair an outdoor surveillance camera; upon opening it up, we discovered that the internal potting material had developed microscopic cracks due to temperature fluctuations, resulting in a short circuit within the circuitry. This experience drove home the realization that selecting the appropriate potting material is not a trivial matter of simply grabbing the nearest tube of adhesive.<\/p>

Speaking of enclosure design, I believe this is often an overlooked\u2014yet critical\u2014aspect of the process. I have encountered far too many cases where a poorly designed internal structure\u2014such as excessively sharp corners or insufficient clearance\u2014led to uneven distribution of the potting material during application, ultimately compromising its protective efficacy. Imagine a suit of armor that is riddled with holes; no matter how superior the material itself may be, it remains utterly useless. Therefore, truly effective potting requires meticulous foresight right from the initial stages of enclosure design, ensuring a perfect synergy between the structural form and the encapsulating material. I have encountered engineers who tend to chase after the latest and most expensive potting materials, only to find that the actual results fall short of those achieved by time-tested, conventional options. The issue lies not with the materials themselves, but rather with whether they are appropriately matched to specific requirements. For instance, high-temperature environments may demand materials with superior heat resistance, whereas settings subject to frequent mechanical vibration require a focus on material toughness. These specific details are often far more critical than blindly following trends.<\/p>

In my view, the core principle of the potting process is balancing protection with maintainability. Some products, once potted, become virtually impossible to repair; this can lead to significant complications in practical applications. Therefore, the ideal solution involves ensuring robust protection while simultaneously allowing for a certain degree of repair access\u2014or by employing a reversible potting method. This approach serves to extend the product’s lifespan without driving up future maintenance costs. This philosophy has already been validated across a wide range of industrial equipment and serves as a valuable model for us to emulate.<\/p>

Finally, I would like to emphasize that potting is not an isolated technique; it must work in synergy with the overall product design. From material selection and cavity optimization to process implementation, every single step influences the final outcome. Only by integrating these various stages into a cohesive whole can we truly unlock the full value of potting, rather than simply treating it as a static, isolated step within the manufacturing workflow.<\/p>

I have spent a considerable amount of time contemplating the subject of PCB potting. Many people tend to focus immediately on technical data sheets\u2014scrutinizing metrics such as hardness and thermal resistance\u2014but the real key lies in clearly defining the specific environmental conditions and stresses your circuit board will actually encounter.<\/p>

I have seen far too many instances where people blindly pursued high material hardness, only to have the solder joints tear apart the moment the circuit board underwent even slight deformation. On one occasion, while helping a friend repair an industrial controller, I discovered upon opening it that the epoxy resin used for potting had placed the entire circuit under excessive mechanical tension; consequently, just a few cycles of temperature fluctuation had caused fine cracks to develop. We subsequently switched to a polyurethane-based potting compound, which yielded much better results; after all, some degree of vibration is often unavoidable, and the potting material needs to be flexible enough to move in tandem with the circuit board.<\/p>

This is not to say that epoxy resin is inherently poor; indeed, it provides an exceptionally robust outer shell\u2014effectively encasing the circuit board in a suit of armor. However, if that armor is too rigid, it can actually cause internal damage to the components it is meant to protect; the choice of material must always be dictated by the specific application scenario. For demanding environments\u2014such as automotive electronics, where resistance to both oil exposure and mechanical shock is paramount\u2014I believe a layered potting approach is worth considering: using epoxy resin to protect critical components, while employing a more flexible potting material for the surrounding areas.<\/p>

One particularly practical advantage of polyurethane is its reparability. Should the need arise to troubleshoot a fault, a flexible potting material can often be carefully peeled away to allow for inspection; with epoxy resin, however, the entire assembly typically has to be scrapped. The last time we encountered an issue with a drone flight control module\u2014fortunately, we had used polyurethane potting compound. Thanks to that, we were able to perform a localized repair and continue using the unit.<\/p>

When selecting materials, don’t just take the supplier’s boasted specifications at face value; it is best to obtain samples and conduct thermal cycling tests. Cycle the samples several times between extreme temperatures\u2014say, from -40\u00b0C up to +80\u00b0C\u2014to check for any signs of cracking at the potting interface. Counterintuitively, some low-modulus polyurethane compounds actually perform more reliably in extreme environments than rigid materials do.<\/p>

Ultimately, the goal of potting isn’t simply to make the assembly as rigid as possible, but rather to ensure it meets the specific requirements of the application. In environments characterized by massive temperature fluctuations\u2014such as in aerospace\u2014you actually need materials capable of absorbing mechanical stress. For instance, a deep-sea submersible I recently helped retrofit utilized a modified polyurethane compound; under high-pressure conditions, it provided far superior protection compared to traditional potting solutions.<\/p>

It is also crucial to keep an eye out for any changes in physical appearance. Some materials tend to yellow significantly and become brittle as they age; when this occurs, you should consider replacing the component\u2014even if its electrical parameters remain within spec. After all, what we are after is long-term, reliable protection\u2014not just a set of favorable data points in the short term.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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Truly effective PCB potting should be akin to dressing a circuit board in a perfectly tailored garment: it shouldn’t be so tight that it restricts movement or function, nor so loose that it fails to provide adequate protection. Experimenting with various material combinations often yields far better results than simply fixating on a single type of material.<\/p>

I have seen far too many engineers stumble when it comes to PCB potting. They often fall into the trap of believing that simply selecting the most expensive material will provide a “set it and forget it” solution\u2014but in reality, that is rarely the case.<\/p>

Last year, a friend working in automotive electronics insisted on using a high-end thermally conductive potting compound for a control module. The result? An entire batch of products cracked during high-temperature testing. It was only later that they discovered the material’s coefficient of thermal expansion was completely incompatible with that of the circuit board.<\/p>

What truly matters is having a deep understanding of the environmental conditions your product will be subjected to.<\/p>

For example, the greatest advantage of silicone-based materials lies in their ability to withstand drastic temperature fluctuations; they can maintain their elasticity across a vast range\u2014from tens of degrees below zero up to 200\u00b0C. This characteristic is absolutely critical for equipment that operates outdoors or in exposed environments.<\/p>

However, what many people fail to realize is that silicone\u2019s adhesion to external enclosures is often less than ideal. If you require the potting layer to remain firmly bonded to the housing, you may need to consider incorporating a specialized bonding agent or exploring an alternative approach.<\/p>

I personally prefer to begin with small-scale laboratory tests: I apply various mixtures of potting compounds to scrap PCBs and observe their condition once cured. Sometimes, I even go so far as to freeze the samples overnight in a refrigerator, then place them out in direct sunlight on a balcony to simulate real-world operating conditions. The curing process also warrants close attention. While some materials appear capable of curing at room temperature, failure to properly control ambient humidity can result in surface frosting, thereby compromising final performance.<\/p>

An increasing number of products are now adopting hybrid material strategies: using thermally conductive potting compounds around heat-generating components while employing more flexible materials in other areas. This zonal approach effectively addresses heat dissipation challenges without rendering the entire circuit board rigid.<\/p>

Ultimately, selecting a potting material is akin to dressing a circuit board: it must provide protection without hindering operational flexibility. Striking this delicate balance often requires extensive trial and error.<\/p>

I\u2019ve recently been exploring the subject of circuit board protection and have noticed that many people\u2014right from the start\u2014tend to focus exclusively on using high-end, exotic materials. In reality, this approach may be somewhat misguided. While PCB potting is undoubtedly an effective protective measure, its true value extends far beyond simply fitting the board with a “raincoat.”<\/p>

I recall helping a friend repair the mainboard of an underwater device last year. Upon disassembly, I found the interior caked in limescale; yet, the section of the circuitry that had undergone potting remained fully functional. This experience taught me that true protection isn’t merely about encasing the circuitry in an airtight seal; rather, it requires establishing a certain “symbiosis” between the material and the circuit board itself. It is much like dressing a precision instrument: a fit that is too tight can impede heat dissipation, while one that is too loose offers insufficient protection against moisture ingress.<\/p>

The market is currently flooded with a dizzying array of potting compounds, and some people insist on purchasing only those with the highest technical specifications. However, I once used a standard silicone compound to treat a set of outdoor sensors, and five years later, they remain in stable operation. The key lies in selecting materials based on the specific application scenario, rather than blindly chasing impressive data points. For instance, equipment subject to frequent vibration requires materials with high elasticity, whereas devices operating in high-temperature environments demand materials with superior aging resistance.<\/p>

During a factory visit on one occasion, I observed a fascinating phenomenon: when using the exact same potting compound, the scrap rate for boards manually potted by a veteran technician was actually lower than that of boards processed by automated machinery. Upon closer inquiry, I learned that\u2014prior to dispensing the compound\u2014he would preheat the boards to approximately 60\u00b0C; this allowed the compound to penetrate more effectively into the minute crevices between components. Such nuanced details are rarely documented in standard process manuals; they represent the accumulated wisdom of years of hands-on experience.<\/p>

The true test of one’s expertise lies in mastering the appropriate thickness of the potting layer. A layer that is too thin fails to prevent moisture from infiltrating the edges of the circuitry, whereas a layer that is too thick can significantly complicate future repair and maintenance efforts. My personal practice is to apply a slightly thicker layer over interface points\u2014areas particularly susceptible to oxidation\u2014while keeping the potting layer relatively thin and light across the remaining sections of the board. After all, the goal of protection isn’t to turn a circuit board into a solid brick, but rather to strike a balance between safety and maintainability.<\/p>

The most disastrous case I\u2019ve ever witnessed involved someone completely encapsulating an entire circuit board in solid resin\u2014only for it to overheat and burn out. In reality, for areas surrounding high-heat components\u2014such as power devices\u2014one could simply leave open channels for heat dissipation while applying localized encapsulation to the rest of the board. Ultimately, the true mark of expertise in this protective process lies in achieving a delicate balance: safeguarding the circuitry effectively without compromising the operational flexibility required for its normal function.<\/p>

I\u2019ve seen many people get so hung up on complex parameter settings during PCB potting that they end up overlooking the absolute basics. Take the pouring process, for instance: some people obsess over using high-tech equipment to precisely control the flow rate, when the real key lies in simply observing the condition of the material itself. I once watched an engineer continue the potting process even after the material had clearly begun to show signs of separation or stratification. The result? When the cured board was later cut open for inspection, the interior was riddled with honeycomb-like air bubbles.<\/p>

The degassing\u2014or bubble removal\u2014stage is particularly prone to being underestimated. Many people assume that simply applying a vacuum is all that\u2019s required, but what truly matters is understanding the specific characteristics of the material being used. Some epoxy resins possess a very high viscosity at room temperature, meaning that relying solely on vacuum degassing yields very limited results. My personal practice is to let the mixed material sit undisturbed for a few minutes first, allowing the larger bubbles to naturally rise to the surface, before using vacuum equipment to tackle the finer, microscopic bubbles. Although this method adds a little extra time to the process…<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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I\u2019ve seen far too many people oversimplify PCB potting, treating it as nothing more than fitting a circuit board with a raincoat. In reality, the process is far more complex than one might imagine\u2014not every electronic device needs to be completely submerged in resin to survive.<\/p>

I recall helping a friend last year redesign the protection scheme for an outdoor monitoring device. Their initial plan involved full encapsulation; however, they soon discovered that this not only caused costs to skyrocket but also turned subsequent debugging and maintenance into an absolute nightmare. We eventually shifted our approach: we applied localized sealing only to the sensor interface ports, while treating the main circuit board with a standard conformal coating (a “three-proof” coating). The results were far more ideal. This flexible, hybrid approach reinforced my realization that protective strategies must be carefully tailored to fit the specific requirements of the actual application scenario.<\/p>

Whenever the topic of electronic protection arises, many people\u2019s immediate instinct is to completely encase the entire circuit board, sealing it off hermetically. However, the reality is that over-protection can often introduce a host of new problems\u2014such as impeded heat dissipation, increased difficulty in repairs, or even cracked solder joints caused by mismatches in the thermal expansion coefficients of the various materials involved. I tend to view potting as a last line of defense rather than a primary solution.<\/p>

Nowadays, some engineers are particularly fixated on imported potting compounds; however, the products from several major domestic manufacturers actually perform quite well under standard conditions. The key lies in ensuring proper surface pretreatment. Last week, while disassembling a failed industrial controller, I discovered that\u2014despite utilizing a top-tier sealant\u2014the protective coating had blistered and completely failed due to inadequate cleaning of the circuit board surface. Such details are often far more critical than the material itself.<\/p>

The true test of technical expertise lies in striking a balance between protection and maintainability. Automotive electronics engineers have demonstrated a clever approach in this regard: they employ a removable potting structure for key modules, which not only satisfies vibration resistance requirements but also preserves access for maintenance and repair. This design philosophy holds far greater value than simply “stacking materials” (over-engineering with excessive components).<\/p>

I was pleasantly surprised by a flexible potting material I encountered recently. It exhibits outstanding impact resistance and permits a certain degree of bending\u2014making it an intriguing new option for devices that are frequently moved or subjected to dynamic stress. However, its price point is indeed significantly higher than that of traditional epoxy resins.<\/p>

Ultimately, electronic protection is akin to choosing the right attire: you wouldn’t wear short sleeves in the dead of winter, nor would you bundle up in a heavy coat during the sweltering heat of summer. The greatest pitfall is blindly applying standard, off-the-shelf solutions without discrimination; every project warrants a fresh, critical re-evaluation of its specific protection strategy.<\/p>

I\u2019ve recently noticed that many people oversimplify the concept of PCB potting. They often assume that one can simply pick a random material, encase the circuit board in it, and call it a day. In reality, anyone who has actually managed a few projects will understand that the issues involved are far more complex. I recall a project involving outdoor equipment last year where the entire production batch had to be reworked solely because the surface pre-treatment was inadequate. At the time, we believed the board surfaces were sufficiently clean; however, just three months after potting, delamination began to occur.<\/p>

Perhaps the most vexing aspect of PCB potting is material selection. Some engineers favor epoxy resins for their high mechanical strength, while others insist on using silicone for its superior thermal stability. Yet, in practical applications, one often needs to balance multiple competing factors\u2014such as flexibility, thermal conductivity, and cost considerations. I have seen far too many teams rush through the material testing phase, only to discover critical flaws once mass production begins\u2014at which point, it is often too late to implement corrections.<\/p>

The pre-treatment stage is frequently underestimated. Any residual contaminants on the circuit board surface can compromise the effectiveness of the potting process. During a factory visit on one occasion, I observed technicians attempting to clean boards merely by blowing compressed air over them\u2014a method that falls woefully short of industrial-grade standards. We subsequently switched to a specialized cleaning agent combined with ultrasonic treatment, which finally resolved our adhesion issues. These seemingly trivial details can, in fact, have a direct and profound impact on the product’s overall lifespan.<\/p>

Nowadays, whenever I embark on a new project, I begin by thoroughly analyzing the intended operating environment before formulating a protection strategy. Environments characterized by high temperatures and humidity may necessitate a multi-layered protection scheme, whereas applications involving frequent vibration demand a primary focus on the material’s elasticity and resilience. For a vehicle-mounted device project I am currently working on, we have adopted a composite potting solution: a flexible base layer serves to cushion against vibration, while a rigid top layer provides robust physical protection for the electronic components. This customized approach is far more effective than simply applying off-the-shelf solutions.<\/p>

The true test of technical expertise lies in handling anomalies. Last week, when our production line discovered air bubbles forming after the potting process, we worked through the night to fine-tune our vacuum degassing parameters. This ability to resolve issues in real-time is far more critical than any theoretical knowledge\u2014after all, the material characteristics of every batch can vary slightly. Maintaining a keen sensitivity to process parameters is the only way to ensure consistent quality.<\/p>

My most profound realization is that potting technology requires continuous iteration. A solution that seemed perfect last year might have a superior alternative this year. Rather than chasing a “set it and forget it” solution, it is far better to cultivate a mindset of dynamic optimization.<\/p>

Whenever I hear people make PCB potting sound incredibly complicated, I can’t help but chuckle. Fundamentally, the process is nothing more than encapsulating electronic components to provide them with protection.<\/p>

I\u2019ve seen far too many people get bogged down in the minute details of the potting process. They are constantly preoccupied with identifying which piece of high-tech equipment to use to measure this or that specific metric.<\/p>

In reality, you only need to focus on one thing: can the material uniformly cover the entire circuit board?<\/p>

I recall a project last year where we utilized a novel type of epoxy resin. Initially, the team was extremely concerned that an insufficient curing time would compromise performance.<\/p>

We decided to produce several sample boards first to test the effects of various conditions. As it turned out, as long as the ambient temperature remained stable, there was absolutely no need for such an overly complex process.<\/p>

That obsession with achieving a theoretically “perfect” cure actually tends to invite problems. On one occasion, in an effort to meet a tight deadline, we shortened the waiting period\u2014only to discover that the product actually performed better under extreme environmental conditions.<\/p>

This experience made me realize that, at times, rigid adherence to standard procedures can actually stifle innovation. Nowadays, whenever I undertake projects of this nature, I always leave room for adjustment rather than rigidly fixating on specific parameters. After all, the ultimate objective is to ensure the equipment operates stably\u2014not merely to satisfy the numbers on a datasheet, right?<\/p>

What truly matters is understanding the inherent characteristics of your materials, rather than blindly following so-called “best practices.” Every project presents a unique set of requirements; blindly shoehorning someone else’s solution into your own context often proves counterproductive.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"

As a circuit board is slowly enveloped by a transparent encapsulant, many assume that PCB potting is merely a simple packaging process. However, improper material selection can lead to hidden defects such as cracking and blistering. For instance, a mismatch in the coefficient of thermal expansion can easily result in cracks when the board is exposed to humid environments with significant temperature fluctuations. Nowadays, self-healing potting compounds are available that can automatically repair micro-cracks; while slightly more expensive, they are highly practical for outdoor equipment. Layered potting is another technique worth exploring: first, a flexible resin is used to protect core chips; next, a high-thermal-conductivity material covers heat-generating components; and finally, the entire assembly is…<\/p>","protected":false},"author":1,"featured_media":6852,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[51],"tags":[],"class_list":["post-7729","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blogs"],"blocksy_meta":[],"yoast_head":"\nCommon Pitfalls in PCB Potting: Why Your Circuit Boards Keep Cracking and Blistering<\/title>\n<meta name=\"description\" content=\"As a circuit board is slowly enveloped by a transparent encapsulant, many assume that PCB potting is merely a simple packaging process. However, improper material selection can lead to hidden defects such as cracking and blistering. For instance, a mismatch in the coefficient of thermal expansion can easily result in cracks when the board is exposed to humid environments with significant temperature fluctuations. Nowadays, self-healing potting compounds are available that can automatically repair micro-cracks; while slightly more expensive, they are highly practical for outdoor equipment. Layered potting is another technique worth exploring: first, a flexible resin is used to protect core chips; next, a high-thermal-conductivity material covers heat-generating components; and finally, the entire assembly is...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.sprintpcbgroup.com\/ja\/blogs\/pcb-potting-board-cracking-blistering-causes\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Common Pitfalls in PCB Potting: Why Your Circuit Boards Keep Cracking and Blistering\" \/>\n<meta property=\"og:description\" content=\"As a circuit board is slowly enveloped by a transparent encapsulant, many assume that PCB potting is merely a simple packaging process. However, improper material selection can lead to hidden defects such as cracking and blistering. For instance, a mismatch in the coefficient of thermal expansion can easily result in cracks when the board is exposed to humid environments with significant temperature fluctuations. Nowadays, self-healing potting compounds are available that can automatically repair micro-cracks; while slightly more expensive, they are highly practical for outdoor equipment. 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