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Potting compounds : 
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Introduction R-381-m potting compounds consist of epoxy resin, hardener and filler etc. R-381-1 cures at 70-110 ° C and R-381-3 cures at room temperature. Their thermal class is F(155 ° C). They have gained UL certification (E229550) and UL insulation system (E242776).
With excellent processing, insulation property, low shrinkage, fire and crack resistance, it is used for encapsulating and potting apparatus coils, such as: small transformer, instrument transformer , ignition coils of autocycle and auto etc.
R-381-m series resins are black or white, or other colors as customer request.
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Technical Date sheet
Property |
R-381-1 |
R-381-2A |
R-381-2B |
R-381-3 |
appearance |
A |
Black |
Black |
Black |
Black |
B |
Brown liquid |
Brown liquid |
Yellow liquid |
Brown liquid |
Fire resistance |
V-0 |
V-1 |
V-1 |
V-0 |
Curing condition |
70 - 80° C, 4 - 6h
Or 100 - 110° C, 2 - 3h |
23 ° C , 12h |
70 - 80° C, 4 - 6h
Or 100 - 110° C, 2 - 3h |
23 ° C , 12h |
Proportion |
100/25 |
100/25 |
100/25 |
100/25 |
| Utility time after mixture |
100° C, 15 - 30 minutes |
23° C, 30 minutes |
100° C,15 - 30 minutes |
23° C, 30 minutes |
Hardness |
75±5 Shore D |
Volume resistivity |
Before immersion in water |
Lager than 1×10 13Ω.m |
After in water |
Lager than 1×10 12 Ω.m |
Dielectric strength |
- |
Lager than 20KV/mm |
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