💡 In This Article The relationship between 85/85 testing and an epoxy Tg above 85°C Dry Tg vs. Wet Tg and practical considerations for measuring them Moisture saturation and the possibility of irreversible degradation Why moisture reliability must be designed around the entire adhesive system rather than a single property In the previous article, "Why … Continue reading Why Does Epoxy Look Fine When Dry but Fail After Absorbing Moisture? ② — Why Did 85/85 Still Fail Even Though Tg Increased?
Category: Epoxy Troubleshooting
Why Does Epoxy Look Fine When Dry but Fail After Absorbing Moisture? ① — Why 85/85, PCT, and HAST Testing Exist
💡 In This Article Why initially strong adhesion can deteriorate rapidly under high-temperature, high-humidity conditions How moisture penetrates an adhesive layer even when no visible damage is present Why accelerated reliability tests are used, and how 85/85, PCT, and HAST differ The basic concept of acceleration factors and humidity-accelerated lifetime models In the previous article, … Continue reading Why Does Epoxy Look Fine When Dry but Fail After Absorbing Moisture? ① — Why 85/85, PCT, and HAST Testing Exist
Why Does Adhesion Fail Later Even When It Was Good Initially? — How Thermal Shock Causes Adhesive Failure
💡 In This Article Why an epoxy adhesive with excellent initial adhesion can lose adhesion after reliability testing How differences in coefficient of thermal expansion (CTE) affect the adhesive interface How cracks initiate and propagate under repeated thermal shock conditions In the previous article (Does More Toughener Always Mean Better Adhesion?), I covered the optimum … Continue reading Why Does Adhesion Fail Later Even When It Was Good Initially? — How Thermal Shock Causes Adhesive Failure