Firm-durometer platinum-cure RTV-2 silicone for prototyping and foam casting

General Information

P-50 is a two component addition cure silicone rubber mold making material. It has a high durometer, high modulus, superb physical properties, minimal shrinkage and extreme chemical resistance making it an excellent choice for prototyping, casting urethane foam and other plastics. P-50 also serves as an excellent choice for use in trapped rubber molding and pressure intensifier applications when working with composites.

Typical Properties

Uncatalyzed Compound

Color

Base:TanActivator:Green

Viscosity

Base:110,000–130,000cpsActivator:1,000–2,000cps

Mixing Ratio

By weight:100:10By volume:100:13.8

Mixed Viscosity

70,000–90,000cps

Working Time

1.5–2.5hours

Cure Time

16–18hours

Shelf Life

6months

Vulcanized (Cured) Properties

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

Shore A Hardness

One day:527 days:54

±4 durometer

Tear Resistance

70 ± 15ppiASTM D624

Tensile Strength

750 ± 50psiASTM D412

Elongation

200 ± 25%ASTM D412

Service Temperature

-60 to 650°F

Shrinkage

0.00%

Specific Gravity

1.30

Coverage

21.3in³ / lb

Post cure Shore A (±4)

55 after 1 hour at 150°F, 56 after a further hour at 250°F, 57 after a further hour at 300°F

Coeffecient of Thermal Expansion (linear)

2.69 x 10-4m/m-0C