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
Which Silicone Should I Choose?
15A is a softer, more flexible silicone for detailed moulds and easy release; 30A is firmer and holds its shape better. Each comes in a smaller and a larger kit.
15A 1 kg
Most Popular
Sale price£24.99 Regular price£29.99 A soft, flexible silicone for smaller moulds, intricate shapes and projects where easy demoulding is important.
Best for:Jewellery moulds, charms, small decorative pieces, detailed shapes, undercuts and delicate castings.
Choose 15A 1 kg if:You are making one or several small moulds and need maximum flexibility for fine details and easier release.
15A 4 kg
Best for Larger & Multiple Flexible Moulds
Sale price£64.99 Regular price£69.99 A larger supply of soft 15A silicone for makers producing several detailed moulds or working on larger flexible mould projects.
Best for:Multiple jewellery or craft moulds, detailed decorative moulds, larger flexible moulds, workshops and repeated mould making.
Choose 15A 4 kg if:You regularly make soft, detailed moulds or need enough silicone for several moulds or larger projects.
30A 1 kg
Best for Structured & Durable Moulds
Sale price£24.99 Regular price£29.99 A firmer silicone for moulds that need more support, stronger shape retention and greater stability during casting.
Best for:Trays, candles, sculptures, functional moulds, medium-sized moulds and shapes with straighter walls.
Choose 30A 1 kg if:You are making small-to-medium moulds that need to hold their shape better than a softer 15A silicone mould.
30A 4 kg
Best for Large & Repeated Casting
Sale price£64.99 Regular price£69.99 A larger supply of firm 30A silicone for bigger moulds, repeated casting and high-volume mould making.
Best for:Large moulds, trays, sculptures, heavier castings, repeated production, workshops and professional mould making.
Choose 30A 4 kg if:You make larger moulds, cast repeatedly or need a durable silicone for ongoing or higher-volume production.
Product specifications
Craft Resin Silicone is a platinum-cure RTV silicone designed for reliable mould making with smooth pouring, accurate detail capture, and easy demoulding. The formula features a simple 1:1 mix by weight, cures in 3–5 hours at 25 °C, and is available in two hardness options to suit different mould types and casting needs.
Platinum-cure RTV silicone
1:1 by weight
Low-viscosity, low-bubble
Captures fine details, textures, and edges
Shore A 15 ± 2 (soft and flexible) / Shore A 30 ± 2 (firm and durable)
20–40 minutes
3–5 hours at 25 °C
≤ 0.1%
Easy release for detailed castings
Tear-resistant and reusable
Resin, soap, candles, plaster, concrete, and other casting projects
12 months
How to use
Making custom silicone molds is easy when you use the right technique. Learn how to prepare your master, mix and pour silicone properly, and achieve flexible, durable molds with clean detail and reliable results.
Ultimate Guide to Craft Resin Mold Making Silicone
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.
Real Projects Made with Our Silicone
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