Merits and demerits of silicone and polyurethane resin for electronic potting

The comparisons of Liquid silicone and Polyurethane resin for electronic potting

2022-02-22

Features and Properties	Silicone rubber	Polyurethane resin
Modification ability	Better modification ability and good electrical insulation ability by adding different additives	Could be modified its own thermal conductivity based on different products potting
Resistance for high and low temp	Excellent resistance for temp, do not crack and stay good elasticity under temp from -60℃~200℃; better for working under harsh environment	Easy crack especially under high and low changing temp; thereof, effect the moisture resistance
Hardness and flexibility	Lower hardness, better flexibility	High hardness, very stiff, less flexibility, therefore, less anti-shock ability
Heat and corrosive substance release	Do not release heat and corrosive substance during curing, more friendly and protective for Electronic Components	Will release more or less heat during curing
UV-proof and anti-aging	Better UV-proof and anti-aging
Adhesive ability	Slightly less than Polyurethane resin under normal condition, but could be largely increased with premier	Better than silicone rubber
Applications	Excellent materials for electronic parts potting, especially for precision components potting and protection	Excellent and economic materials for electronic parts potting