Silicone Firm Gels

01/01/2000

Two primerless encapsulants are designed to bring good adhesion and stress relief to electronic applications along with a fast, room-temperature cure. The 3-4220 Firm Gel is one part blue and one part yellow, which is said to facilitate visual inspection for complete mixing. The formulation cures to a green, translucent elastomer with a hardness of approximately 13 to 15 points (depending on cure conditions) in Shore 00 durometer testing. The 3-4219 Firm Gel is a clear version of the original. It contains no dye or UV indicator and is designed to help prevent RF interference in applications involving wireless communications.

Dow Corning Corp.

Midland, Mich.