Overview
The C-SIL 285 is an RTV silicone rubber, supplied in pourable liquid kit form, which will cure into an elastomeric solid with excellent physical, thermal and electrical properties. C-SIL 285 is useful for making tough, flexible molds, as a caulking and sealing compound, and for encapsulating electrical parts. C-SIL 285-LS is a special grade for applications requiring minimal shrinkage during cure.
C-SIL 285 will cure and bond to itself, but will release fairly easily from most smooth, non-porous surfaces. To improve release, a silicone grease such as Dow Corning “Compound 7” may be applied. The use of this or similar release agents is also recommended when casting epoxies or similar thermosetting resins in C-SIL molds.
INSTRUCTIONS FOR USE
- Mix Part A thoroughly, and measure out the amount of material required.
- For every 100 grams of Part A, add 2.5 to 3.2 grams of Part B. Note: 40 drops from a typical medicine dropper = one gram. Pot life is about one-half hour at room temp.
- Mix materials thoroughly. De-gassing under vacuum is recommended. Pour material into mold or cavity.
- The material will solidify overnight at room temperature, but maximum properties will not be achieved until several days later. Cure may be accelerated by heating to 150°F for four hours.
C-SIL materials are non-toxic and safe, provided care is taken to protect eyes and avoid excessive skin contact and breathing of vapors. Consult the Materials Safety Data Sheet for details.
TYPICAL PROPERTIES | ||
C-SIL 285 | C-SIL 285 LS | |
Color | White | White |
Viscosity @ 25°C | 38,000 cps | 44,000 cps |
Shelf Life | 12 months | 12 months |
Durometer Shore A | 55 | 60 |
Shrinkage | 1.70 | 1.90 |
Dielectric Strength | 700 v/mil | 700 v/mil |
Dielectric Constant | 4.0 | 4.0 |
Dissipation Factor | 0.02 | 0.02 |
Thermal Conductivity | 0.012 cal/(sec-cm-°K) | 0.012 cal/sec-cm-°K) |
Max. Use Temperature | 400°F | 400°F |