Liquid Silicone Rubber for Mold Making and Casting
Liquid silicone rubber is a two-part RTV material used to make flexible molds for resin, candle, wax, soap, plaster, concrete, and other casting projects. Craft Resin Silicone is designed for easy mold making with a simple 1:1 mix by weight, low viscosity for smooth pouring, and accurate detail reproduction in complex shapes, textures, and fine edges. It is a strong choice for makers who want reliable results, easier demolding, and a cleaner workflow for both small creative projects and repeat mold use.
Designed for practical, everyday mold making, the formula helps reduce bubbles, cure at room temperature in about 4 hours, and create smooth molds with sharp detail and consistent shape. Choose 15A when you need a softer, more flexible silicone for easier release from detailed pieces, or 30A when you need a firmer, more durable mold that holds its shape better through repeated castings.
15 Shore A
30 Shore A
Fine detail, undercuts, and delicate molds
Larger molds, straighter walls, and heavier castings
Softer and more flexible
Firmer and more supportive
Easier to release from intricate shapes
Better for molds that need more structure
Better for flexible, detailed molds
Better for molds that need to hold their shape
Jewelry, charms, small decorative pieces
Trays, sculptures, candles, functional molds
You want more flexibility and easier demolding
You want more support and stronger shape retention
4 products
Product specification
Craft Resin Silicone is a platinum-cure RTV silicone designed for reliable mold making with smooth pouring, accurate detail capture, and easy demolding. The formula features a simple 1:1 mix by weight, cures at room temperature in approximately 4 hours, and is available in two hardness options to suit different mold types and casting needs.
Platinum-cure RTV silicone
1:1 by weight
Low-viscosity, low-bubble
Captures fine details, textures, and edges
15A soft and flexible / 30A firm and durable
Approximately 4 hours at room temperature
Easy release for detailed castings
Tear-resistant and reusable
Resin, soap, candles, plaster, concrete, and other casting projects
FAQ
What is silicone rubber used for in mold making?
Silicone rubber is used to create flexible molds for casting resin, soap, wax, and more. It captures fine details and allows easy release.
Is silicone better than other mold materials?
Silicone is flexible, durable, and non-stick, making it ideal for detailed and reusable molds.
How do I use silicone to make a mold?
Mix equal parts, pour over your object, let it cure, and remove the original - your mold is ready to use.
How long does silicone take to cure?
Curing time depends on temperature and thickness, but most silicones cure within a few hours.
How do I avoid bubbles in silicone molds?
Pour slowly, mix carefully, and work in a stable temperature to reduce trapped air.
Can beginners use silicone for mold making?
Yes, especially 1:1 mix silicone - it’s easy to use and doesn’t require special tools.
How do I clean and store silicone molds?
Wash with mild soap, dry fully, and store in a cool, dust-free place.