Silicone Platinum RTV
R-2240 Clear (40A Shore)
R-2240 A/B Two-Part, Platinum RTV (Additon Cure) Clear silicone rubber designed for mold making, embedding, and electrical applications and thermal expanding tools. The controlled coefficient of thermal expansion makes R-2240 A/B ideal for casting pressure pads and for use as an advanced composite tooling rubber where RTV clarity assists in mold cut out or as a visual aid for injecting resin.
Physical Properties (TYPICAL VALUES):
Uncured Compound Cured Compound 24 hrs. @ 77F (25C)
Color: Clear Specific Gravity: 1.08
Mix Viscosity @ RT: 40,000 Durometer: 40
Mixing Ratio A/B: 10/1 Tear Strength: 100
Tensile Strength (PSI): 640
Elongation %: 320
Thermal Conductivity BTU-FTF: 1.5-5
Coefficient of Thermal Expansion IN/INF: 8.5 X 10
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 vacuum is drawn, the material will expand as much as four times its original volume. Remove from vacuum chamber.
Inhibition:
Certain materials will cause inhibition or neutralizing of the curing agent: sulfur and organo-metallic salt containing compounds found in organic rubbers, and many 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
|
TEMPERATURE |
POT LIFE |
CURE TIME |
|
100 F |
30 MIN |
2 HOURS |
|
150 F |
10 MIN |
30 MIN |
|
300 F |
---- |
5 MIN |
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.