Ec m21 scaled


EPOXICAST™ M21 is a low viscosity, high temperature underfill epoxy encapsulant. Usable as a stand alone underfill or as an encapsulating material in dam-and-fill applications, EC-M21 exhibits high strength, high Tg, and long work life for versatile use. This highly filled epoxy, a low CTE helps keep fragile components from movement during temperature cycling.

Product Specifications

No.of Components 1
Mix Ratio by Weight
Mixed Viscosity @RT(cps) 4,000-6,000
Pot Life @25°C(100 gram) 48 hrs
Recommended Cure 60 min @ 125°C
Alternate Cure 15 min @ 150°C
Color Black
Specific Gravity 1.62
Hardness(Shore) D-90
Refractive Index
Lap Shear Strength @25°C(psi) 1500
Tg(°C) 124
CTE(Below Tg)10-6/°C 37
Service Temp.Range -55°C-220°C
Thermal Conductivity(W/m°K) NA
Volume Resistivity(500 V) 1.0x10^16

Features & Applications:

  • One Component
  • High Tg
  • Fast cure at moderate temperatures
  • Room Temperature Flow Capability
  • Compatible with most Pb-free solders
  • Long Work Life at Room Temperature

Use the form below to request additional information & product data