Translucent medium-durometer platinum-cure RTV-2 mold making silicone

General Information

P-125 silicone rubber is a two-component, addition reaction, platinum catalyzed system that cures at room temperature. Unlike most RTV silicone rubber materials, P-125 is translucent to aid in detection of voids and determination of parting lines. P-125 is nearly transparent in thin sections and has excellent tear resistance and other physical properties. There are two activators available: P-125 A for casting clear polyurethanes, filled or pigmented polyurethanes, epoxies and polyester resins; and P-124 A casting anything EXCEPT clear polyurethanes (slight greasiness can be seen with P-124 A).

Typical Properties

Uncatalyzed Compound

Color

Base:ClearActivator:Clear

Viscosity

Base:170,000cpsActivator:n.a.cps

Mixing Ratio

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

Mixed Viscosity

n.a.cps

Working Time

1.0–2.0hours

Cure Time

16–24hours

Shelf Life

n.a.

Vulcanized (Cured) Properties

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

Shore A Hardness

One day:407 days:40

±4 durometer

Tear Resistance

150 ± 25ppiASTM D624

Tensile Strength

850 ± 50psiASTM D412

Elongation

300 ± 50%ASTM D412

Service Temperature

n.a.

Shrinkage

0.00%

Specific Gravity

1.09

Coverage

n.a.

Alternative activator P-124 A

Tear strength 90 ± 15 ppi, tensile strength 600 ± 50 psi, elongation 350 ± 50 %, Shore A 40 ± 3. For casting anything except clear polyurethanes.