Flame-retardant platinum-cure RTV-2 potting and encapsulation silicone

General Information

P-378 RTV silicone rubber is a black two-component, addition reaction, platinum-catalyzed system that cures at room temperature. It has a low viscosity, is easy to process and its cure rate can be accelerated with heat. It has excellent electrical and thermal properties and is reversion resistant. In addition, it offers outstanding fire resistant properties.

Typical Properties

Uncatalyzed Compound

Color

Base:Black or off-whiteActivator:Off-white

Viscosity

Base:7,500–8,500cpsActivator:7,500–8,500cps

Mixing Ratio

By weight:50:50By volume:n.a.

Mixed Viscosity

7,500–8,500cps

Working Time

4.0–4.0hours

Cure Time

24hours

Shelf Life

2months

Vulcanized (Cured) Properties

Measured at 7 days, 70°F / 50% relative humidity

Shore A Hardness

One day:637 days:70

±4 durometer

Tear Resistance

30 ± 5ppiASTM D624

Tensile Strength

500 ± 50psiASTM D412

Elongation

150 ± 25%ASTM D412

Service Temperature

-60 to 425°F

Shrinkage

n.a.

Specific Gravity

1.45

Coverage

n.a.

Volume Resistivity (ohms/cm)

1 x 10^15

Dissipation Factor (@ 100 Hz)

0.008

Dielectric Constant (@ 100 Hz)

3.1

Dielectric Strength (volts/mil)

500

Thermal Conductivity (cal/cm2/oC/sec/cm)

7 x 10^-4