Silicone Platinum RTV
Clear RTV Systems
These systems are two-part, Platinum RTV (Addition Cure) silicone rubbers that are formulated for clarity while providing excellent physical properties. The controlled coefficient of thermal expansion makes these materials ideal for casting pressure pads and for use as an advanced composite tooling rubber. Use for mold making, embedding, electrical applications, thermal expanding tools, and clear part fabrication.
Inhibition:
Certain materials will cause inhibition or neutralizing of the curing agent: sulfur and organo-metallic salt containing compounds found in organic rubbers, 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 materials.
Physical Properties (TYPICAL VALUES):
| R-2310 | R-2320 LM | R-2230 | R-2240 | |
| Color: | Clear | Clear | Clear | Clear |
| Mixed Viscosity@ R.T.: | 20,000 | 35,000 | 35,000 | 40,000 |
| Specific Gravity: | 1.12 | 1.12 | 1.08 | 1.08 |
| Mix Ratio A/B: | 10/1 | 10/1 | 10/1 | 10/1 |
| Cured Compounds @ 77F (25C) | ||||
| Durometer A Shore: | 15 | 25 | 30 (+/-5) | 40 |
| Tensile Strength (PSI): | 360 | 450 | 750 | 825 |
| Elongation %: | 325 | 310 | 350 | 320 |
| Tear Strength (PSI): | 60 | 80 | 85 | 110 |
| Shelf Life | 6 months | 6 months | 6 months | 6 months |
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 materials will expand as much as four times it’s original volume. Remove from vacuum chamber and pour very gently, so as not to incorporate air back into the material.
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.