Mold Making
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This is a page about making molds. It will be focused on rubber molds (polyurethane rubber, silicone).
Contents
Mold making materials
Polyurethane rubber
Silicone rubber
Tin cure
Platinum cure
Other
Factors to consider when making a mold
- 1 part, 1 part tear, or 2 part mold
- Mold box
- Mold release
- Rubber hardness & viscosity
- Shore hardness
- Vacuum degassing
- Pressure casting
- Master material
- Porosity & sealing
- Materials that inhibit curing
- Sulfur
- Some plastics (see below)
Making mold of 3D printed parts
Cure inhibition
- SLA resin
Mitigating cure inhibition
- https://joshuawoehlke.com/curing-silicone-in-sla-uv-molds-part-3/
- Inhibit X
- Using polyurethane rubber or tin cure silicone instead of platinum cure silicone
- Sealing with acrylic (e.g. Krylon Crystal Clear)
Resources
Where to get mold making materials
- Reynolds Advanced Materials (Denver)
- Sculpture Depot (Loveland)
- Rio Grande
