Silpak, Inc

Silicone Platinum RTV

Extended Work Time (R-2234 SL)

R-2234 SL A/B Two-Part, Platinum RTV (Addition Cure) silicone rubber designed for mold-making, embedding, electrical applications, and thermal expanding tools with longer working time—2hours. The controlled coefficient of thermal expansion makes R-2234 SL A/B ideal for casting pressure pads and advanced composite tooling rubber.

Physical Properties (TYPICAL VALUES)
Uncured Compound:
Color: Blue
Viscosity: 60,000 cps
Mixing Ratio: A:B 100/10 by Weight
Shelf Life: 6 months

Cured Compounds:
24 HOURS: 77F (25C)
Specific Gravity: 1.08
Durometer: 35 +/-5
Tensile Strength (PSI): 525
Tear Strength (PSI): 90
Elongation %: 440

Pot Life: 2 Hours

Thermal Conductivity BTU‑FT F: 8.0 + 102
Coefficient of Thermal Expansion in/in F: 11.0 x 10-4

Mixing Instructions:
The base and curing agent are mixed just before using. Mix 10 parts base to 1 part curing agent by weight. Automatic mixing equipment or manual mixing may be used to combine base and curing agent. Immediately after mixing, place the material in a vacuum chamber to remove trapped air. As the vacuum is drawn, the material will expand as much as four times its original volume. Remove from vacuum chamber and pour very gently, so as not to put air into the material.

Inhibition:
Certain materials will cause inhibition or neutralizing of the curing agent: sulfur and organo-metallic salt containing compounds found in organic rubbers, Condensation cure RTV, chloride solvents, and amines-epoxy. Inhibition may easily be determined by brushing a small quantity of these materials over a localized area of the part to be reproduced. If the material remains gummy or uncured after the curing time, then the part’s surface is acting as an inhibitor. **See Addition Cure Technical Data Sheet for inhibiting

CURING CHART

The information and data contained herein are based on information we believe reliable. Each user of the material should thoroughly test any application and independently conclude satisfactory performance before commercializing. Suggestions of uses should not be taken as inducements to infringe on any particular patent.