Product Description
SMOOTH-SIL 960
Smooth-Sil 960 addition-cure silicones cure at room temperature. Smooth-Sil products are highly versatile and suitable for making molds of all sizes, large or small. These silicones offer excellent chemical, wear, and heat resistance. Materials such as plasters, concrete, wax, low-melting-point metal alloys, or resins (urethane, epoxy, or polyester) can be cast in these silicone rubbers without a release agent. Using a release agent can extend the life of the silicone mold.
Smooth-Sil™ silicones are commonly used for rapid prototyping, wax casting (foundries and candle makers), architectural restoration, and concrete casting. The silicone can also be used for pad printing, a method to transfer images onto hard surfaces.
Smooth-Sil™ 960 is also suitable for food-safe applications.
Features
- Room-temperature cure
- High tear strength
- High heat resistance
- Low shrinkage
- No release agent required
- Food-safe (FDA)
Applications
- Food-safe mold making
- Prototyping
- Mold production
- Wax and plaster casting
- Compatible with most casting resins (urethane, polyester, epoxy)
- Pad printing
Hardness (Shore A) | 60 |
Mixing Ratio (by weight) | 100A : 10B |
Pot Life | 45 min |
Curing Time | 16 h |
Heat resistance (min) | -54 °C |
Heat resistance (max) | 232 °C |
Shrinkage | <0.0254 mm/mm
|
Viscosity (cp) | 30 000 |
Tear strength (N/mm) | 19,3 |
Tensile strength (N/mm²) | 4,48 |
Elongation (%) | 270 |
Color | Green |
Usage Instructions
Mix both components thoroughly, as they may separate during storage. Measure A and B by weight or volume in a 1:1 ratio and mix for at least 3 minutes, scraping container sides and bottom to ensure even curing.
Remove air bubbles by vacuum degassing (pump ≥1 bar). Allow silicone to expand and collapse fully before pouring into the mold.
Pour silicone slowly from the lowest point, filling gradually to avoid bubbles.
Cure at room temperature (23 °C) for at least 6 hours. Avoid curing below 18 °C. Cure time can be shortened with mild heat (e.g., 60 °C oven).
Inhibition: Certain materials (latex, tin-cure silicones, sulfur-rich clays, some woods, new polyester casts, epoxy, and urethane products) may inhibit platinum silicone curing. Test compatibility if unsure. Coating the model with clear acrylic can prevent inhibition.
Safety
Use in well-ventilated areas. Wear safety glasses, long sleeves, and vinyl gloves (latex gloves may inhibit curing). Store and use at room temperature (~23 °C). Higher temperatures shorten working and curing times. Use promptly; product has limited shelf life.