Medium-Density Silicone Elastomer
45B is an elastomer-based product developed and marketed by PCI-Promatec. 45B is typically supplied as a two-part set of A and B liquid components. The A liquid is black and the B liquid is buff for easy identification and inspection of complete mixing. Installed by hand or machine, thorough mixing of the components in a 1:1 ratio yields a high dielectric liquid that cures into a firm elastomer at room temperature with no off-gassing or other by-products. Since it is installed as a liquid, a complete fill in and around penetrating elements is ensured. Cured, it exhibits a durable, damage-resistant exterior surface that is easy to decontaminate.

Fire Qualification
Numerous successful full-scale fire tests have been performed at nationally recognized laboratories for various seal configurations including electrical and mechanical elements in large, complex block out openings. Seal designs have been qualified for a three-hour fire resistance at a 6” depth, without permanent damming.

Pressure Testing
Configurations have been qualified for up to 20-psi pressure resistance with zero leakage at a six-inch depth.

Radiation Resistance
45B has undergone substantial radiation exposure levels (1.25 x 108 Rads Gamma) with no significant changes reported to the material’s physical properties, (fracturing or spalling). Base material has undergone exposures as high as 7.13 x 108

Reparability
45B can be selectively removed with relative ease using blunt non-conductive tools and devices. New 45B material can then be applied to become integral with the existing 45B.

Cure Time
The cure time for the 45B can be as little as 10 minutes, or as long as 8 hours. Custom cure times can be requested.

Packaging
45B is supplied in 100 lb. sets consisting of two five-gallon containers, yielding approximately 1.1 cubic foot of cured material.