TM Scotch-Weld Epoxy Potting Compound/Adhesive DP270 Clear and Black Technical Data March 2019 TM TM Product Description 3M Scotch-Weld Epoxy Potting Compound/Adhesive DP270 (or 3M Scotch- Weld Epoxy Potting Compound/Adhesive 270 B/A) is a two-part, low viscosity epoxy resin system designed primarily for potting, sealing, and encapsulation of many electronic components and is available in clear or black. 3M Scotch-Weld epoxy potting compound/adhesive DP270 is noncorrosive to copper and offers good thermal shock resistance and excellent retention of electrical insulation properties under high humidity conditions. 3M Scotch-Weld epoxy potting compound/adhesive DP270 has a work life of approximately 70 minutes, a tack-free time of about 3 hours and is fully cured after 48 hours at 73F (23C). This product produces no exotherm in 5-10 gram masses and a very slight exotherm in larger masses. 3M Scotch-Weld epoxy potting compound/adhesive DP270 is ideal for the potting and encapsulation of many heat sensitive or delicate components such as glass diodes and sensors as well as for transformers, coils, chokes, relays, etc. It is available in the convenient 3M EPX Applicator System for multi-station usage and in bulk containers for larger volume applications. Available in bulk containers as Scotch-Weld epoxy potting compound/adhesive 270 B/A. Features Good Thermal Shock Resistance Excellent Electrical Properties Meets UL 94 HB (File No. E61941) Noncorrosive to Copper Long Worklife Negligible Exotherm Note: The following technical information and data should be considered representative Typical Uncured or typical only and should not be used for specification purposes. Properties Color: Clear or Black Base Resin: Epoxy/amine Mix Ratio: 1:1 by volume (1:0.85 B:A by weight) Net Weight: Base 9.6 - 9.7 Lbs./Gal. Accelerator 8.0 - 8.2 Worklife: 60-70 minutes 23C (73F) Viscosity: Base 7000 - 16,000 cps 23C (73F) Accelerator 6000 - 12,000 cps 3M Scotch-Weld Epoxy Potting Compound/Adhesive DP270 Clear and Black Note: The following technical information and data should be considered representative Typical Cured or typical only and should not be used for specification purposes. Properties Physical: Color Clear or Black Refractive Index 25C (77C) Clear 1.656 Cure Shrinkage .08% Shore D Hardness 83 (ASTM D-2240) Tack-free Time Approx. 3 hrs. 23C (73F) UL Rating 94 HB (File No. E61941) Cure Time 48 hrs. 23C (73F) Thermal: Weight Loss by TGA (in air) 1% 122C (252F) 5% 175C (347F) 10% 210C (410F) Thermal Coefficient of Expansion by TMA -6 Below Tg 80 x 10 units/unit/C 5-30C range (10-86F range) -6 Above Tg 180 x 10 units/unit/C 60-125C range (140-257F) Glass Transition Temperature by DSC Onset 43C (109F) Mid-Point 49C (120F) Thermal Conductivity ( 110F on .250 samples) 2 BTU - ft./ft. - hr. - F .103 3 Cal./sec. - cm - C .426 x 10 Watt/m - C .177 Thermal Shock Resistance Potted Washer Olyphant Test Pass 5 Cycles without cracking 3M Test Method C-3174 +100C (air) to -50C (liquid) Electrical: Dielectric Constant 3.5 1 KHz 23C (73F) (ASTM D-150) Dissipation Factor .018 1 KHz 23C (73F) (ASTM D-150) Dielectric Strength 850 volts/mil (ASTM D-149) 14 Volume Resistivity 4.1 x 10 ohm-cm (ASTM D-257) Insulation Resistance (.8 mm/.8 mm comb pattern on FR-4) 60C/96% R.H./100 volts d.c.) 13 Initial 3 x 10 ohms 11 1000 hrs. 2 x 10 ohms - 2 -