High-tear platinum-cure RTV-2 mold making silicone

General Information

P-90 is a high tear strength, platinum-catalyzed, RTV-2 silicone rubber. It is easy to mix and de-air, and will cure with virtually no shrinkage. The speed at which the rubber hardens can be dramatically accelerated with heat or with PT-Accelerator, at room temperature. Addition-cure, two-component silicone rubbers exhibit excellent chemical and heat resistance, but may show inhibition sensitivity. P-90 offers excellent release properties and is extremely useful for those applications where exceptional flexibility and tear resistance are required.

Typical Properties

Uncatalyzed Compound

Color

Base:White or TranslucentActivator:Red or Clear

Viscosity

Base:60,000–80,000cpsActivator:1,500–2,500cps

Mixing Ratio

By weight:100:10By volume:100:11.7

Mixed Viscosity

40,000–55,000cps

Working Time

1.0–2.0hours

Cure Time

16–18hours

Shelf Life

6months

Vulcanized (Cured) Properties

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

Shore A Hardness

One day:327 days:35

±4 durometer

Tear Resistance

125 ± 10ppiASTM D624

Tensile Strength

600 ± 50psiASTM D412

Elongation

415 ± 30%ASTM D412

Service Temperature

-60 to 650°F

Shrinkage

0.00%

Specific Gravity

1.13

Coverage

24.5in³ / lb

Volume Resistivity (ohms/cm)

5 x 10^14

Dissipation Factor (@ 100 HZ)

0.006

Dielectric Constant (@ 100 HZ)

2.8

Dielectric Strength (volts/mil)

580