| Silicones - Addition Cure
RTVS 25
RTV SILICONE SEALANT POTTING COMPOUND
DESCRIPTION
RTVS 25 is a reversion resistant, low cost RTV Silicone sealing/potting compound designed for use in high voltage power supplies and assemblies. RTVS 25 is an equal weight or volume ratio mix.
| PROPERTIES UNCURED: |
| |
PART A |
PART B |
|
| Color, visual |
White |
Neutral |
|
| Viscosity, cps |
10,500 |
6,500 |
ASTM D 1084 |
| Specific Gravity |
1.50 |
1.50 |
|
| Mix Ratio, (by weight or volume) |
1:1 |
|
| Mixed Viscosity, cps |
7,500 |
ASTM D 1084 |
| Pot Life @25°C., hours |
1 - 1.5 |
|
| Shelf Life @25°C., months |
6 - 12 |
|
| PROPERTIES-CURED: |
| PHYSICAL |
| Hardness, Durometer, Shore A |
48 |
ASTM D 2240 |
| Tensile Strength, psi |
750 |
ASTM D 412 |
| Tensile Elongation, % |
175 |
ASTM D 412 |
| Tear Strength, Die B lb/in |
20 |
ASTM D 624 |
| Flammability, UL 94V-0 |
Passes |
|
| Short Term Exposure, °C |
250 |
|
| Coefficient of Thermal Expansion, °C |
25.0 x 10-5 |
|
| Thermal Conductivity, BTU-ft/(ft2)(hr)(°F) |
0.21 |
|
| Thermal Conductivity, BTU-in/(ft2)(hr)(°F) |
2.52 |
|
| Useful Temperature Range, °C. |
-55 to 204 |
|
| ELECTRICAL |
| Dielectric Strength, volts/mil |
525 |
ASTM D 149 |
| Dielectric Constant, 1 KHz |
3.5 |
ASTM D 150 |
| Dissipation Factor, 1 KHz |
0.004 |
ASTM D 150 |
| Volume Resistivity, ohm-cm |
1.0 x 1015 |
ASTM D 257 |
MIXING INSTRUCTIONS:
1. Pre-mix both RTVS 25 Part A and Part B prior to use to insure consistency.
2. Measure out equal amounts of Part A and Part B.
3. Mix thoroughly, scraping both the sides and bottom of the container.
4. Evacuate mixture at 29 in. Hg. for 3-5 minutes to insure a void-free casting.
5. Pour into mold or cavity.
CURE SCHEDULES:
Overnight at room temperature or 4 hours at 60°C or 1 hour at 95°C or 15-30 minutes at 120°C.
NOTE: When using a mass over 2 lbs., cure at the lower temperatures to reduce the amount of thermal expansion. For best results, allow a large cast to gel at temperatures below 30°C, then post-cure at 65°C until cured.
SPECIAL NOTES:
Certain materials may inhibit the cure of RTVS 25 when placed in contact with the mixed, uncured rubber. Materials such as amines and amine cured epoxies, sulfur containing materials and condensation (tin cured) silicones, are some which may cause inhibition. Even surfaces which have been in contact with such materials may cause it. If in doubt, a patch test should be done.
IMPORTANT:
The following supersedes any provision in your company's forms, letters and papers. AMERICAN SAFETY TECHNOLOGIES, INC. makes NO WARRANTY, WHETHER EXPRESSED OR IMPLIED, INCLUDING WARRANTIES of MERCHANTABILITY OR of FITNESS FOR A PARTICULAR PURPOSE FOR THIS PRODUCT. No statements or recommendations contained in the product literature are to be construed as inducements to infringe any relevant patent, now or thereafter in existence. UNDER NO CIRCUMSTANCES SHALL AMERICAN SAFETY TECHNOLOGIES, INC. BE LIABLE FOR INCIDENTAL, CONSEQUENTIAL OR OTHER DAMAGES FROM ALLEGED NEGLIGENCE, BREACH of WARRANTY, STRICT LIABILITY OR ANY OTHER THEORY, ARISING OUT of THE USE OR HANDLING of THIS PRODUCT. The sole liability of AMERICAN SAFETY TECHNOLOGIES, INC. for any claims arising out of the manufacture, use or sale of its products shall be to refund the buyer's purchase price, provided such products have been demonstrated in AMERICAN SAFETY TECHNOLOGIES, INC. sole opinion, to justify such refund.
HEALTH CAUTION:
RTV silicone rubber base compounds and the curing agents for addition cure products are non-hazardous and practically non-toxic. Curing agents for condensation cure products contain tin soaps which can irritate eyes and skin of some individuals. Avoid contact with skin; if contact occurs, wash affected areas at once with soap and water. Avoid contact with eyes. In case of contact with eyes, flush with water for 15 minutes; call a physician.
PLEASE REFER TO MATERIAL SAFETY DATA SHEET FOR FURTHER FIRST AID INFORMATION.
FOR CHEMICAL EMERGENCY
CALL CHEMTREC (DAY OR NIGHT) 800 424-9300.
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