Smooth-On - Silicone Mold Making Rubber
Silicone Mold Making Rubber
Reproduce intricate sculptures with beginner-friendly silicone rubber
Smooth-On formulated these silicone rubbers specifically for artists learning mold making. Equal parts by volume means you can measure with cups rather than hunting for a scale, while 4,250 cps viscosity flows into undercuts and surface details without needing vacuum equipment to pull out air bubbles. Room temperature curing eliminates heat chambers or special conditions, just mix, pour, and wait.
Choose your timeline based on your project. OOMOO 30 gives you thirty minutes to work before the material kicks, curing fully in six hours. OOMOO 25 moves faster with a fifteen-minute pot life and seventy-five-minute demold time for rapid prototyping or multiple molds in a session. Both cure to the same lavender or light blue rubber with 240 PSI tensile strength and minimal shrinkage, 0.0025 inches per inch maintains dimensional accuracy from original to reproduction.
These materials excel at simple block molds and two-part molds where you're not demolding around severe undercuts. The 40 pli tear strength handles straightforward releases but won't survive aggressive flexing around complex geometry. Cast plaster, resin, or wax into these molds for sculpture reproduction, prototype development, or decorative elements. Each 2.9-pound kit provides approximately 20.6 cubic inches of cured rubber per pound.
PRODUCT INFORMATION
- Captures intricate details for accurate reproductions
- 1:1 mix ratio requires no scale
- Low 4,250 cps viscosity, no degassing needed
- Room temperature cure with minimal shrinkage
- OOMOO 30: 30-min pot life, 6-hour cure
- OOMOO 25: 15-min pot life, 75-min cure
- Suitable for plaster, resin, and wax casting
- Best for simple block molds
