Soft, flexible epoxies used for crack resistance and low stress


Most epoxies, when cured, create a hard and rigid product prone to cracking and inducing stress on delicate components. While other chemistries such as silicones or polyurethanes can provide softer polymers, they lack the advantages of epoxy systems including water resistance and mechanical strength.

EB-109M-4 was developed by Epoxyset as a softer, more flexible epoxy to give the mechanical strengths of epoxy while inducing lower stress delicate components. EB-109M-4 is part of a series of products by Epoxyset to solve the issue of extremely rigid epoxy systems. This product is used for its electrical isolation properties and its low viscosity allowing for filling small gaps and to backfill empty spaces. EB-109M-4 can even replace standard silicone lens materials in medical imaging systems.

Product Specifications

No.of Components 2
Mix Ratio by Weight 100/28
Mixed Viscosity @RT(cps) 300-600
Pot Life @25°C(100 gram) 1 hr
Recommended Cure 3 hrs @ 65°C
Alternate Cure 24-48 hrs @ 25°C
Color Clear
Specific Gravity 1.16
Hardness(Shore) D-50
Refractive Index 1.54
Lap Shear Strength @25°C(psi) 2200
Tg(°C) 45
CTE(Below Tg)10-6/°C 80
Service Temp.Range -55°C to 90°C
Thermal Conductivity(W/m°K) NA
Volume Resistivity(500 V) >10^14

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