Silicone casting rubber 1:1 Shore 15

RESION Silicone Casting Rubber Shore A15 is a platinum-cure RTV-2 silicone rubber designed to produce flexible moulds for a wide range of applications. It is strong, flexible, food-safe and produces moulds with excellent durability and outstanding detail reproduction.

Thanks to its simple 1:1 mixing ratio, this platinum silicone rubber is easy to use and suitable for both beginners and experienced users. Shore A15 Silicone Casting Rubber is recommended for making moulds for epoxy castings and other food-safe applications.

Features of silicone casting rubber

• Platinum cure (addition-cure): clean curing with minimal shrinkage.
• Shore A15: slightly flexible, ideal for detailed moulds.
• 1:1 mixing ratio: easy to measure and mix.
• Low viscosity: flows easily and helps minimise air entrapment.
• High tensile and tear strength: for long-lasting moulds.
• Food-safe: independently tested and certified by TÜV SÜD as suitable for food contact (Report 7216017173, July 2026), in compliance with EU and German food contact regulations.
• Heat resistant: up to 200°C continuously and 300°C for short periods.
• Chemical resistance: resistant to epoxy resin, polyester resin, polyurethane resins, plaster, concrete and more.
• Low shrinkage: minimal shrinkage after curing.

What is Shore A15 silicone casting rubber used for?

Shore A15 is the ideal choice when you need to produce flexible, highly detailed moulds for applications such as:

• Silicone moulds for epoxy resin castings.
• Polyurethane and polyester casting resins.
• Plaster and concrete moulds.
• Food-safe applications such as chocolate, fondant and ice moulds.

Its moderate flexibility allows cast parts to be released easily without damaging the mould.

Processing platinum silicone casting rubber

1. Accurately weigh Component A (base, blue) and Component B (curing agent, white) in a 1:1 ratio using a scale.
2. Mix both components thoroughly but gently for approximately 3 minutes using a mixing spatula. Scrape the sides and bottom of the mixing container well. Then transfer the mixture to a clean container and mix again.
3. Slowly pour the platinum silicone into the prepared mould or mould box. The working time is approximately 45 minutes at 20°C. At higher temperatures, the silicone cures faster, giving trapped air bubbles less time to escape.
4. After approximately 8 hours, the silicone is fully cured and tack-free.

Specifications

Type: platinum-cure RTV-2
Hardness: Shore A15 (flexible)
Mixing ratio: 1:1
Colour: component A (blue) / component B (white)
Specific gravity: 1.02 kg/dm³ (1 liter weighs approx. 1 kg)
Working time: approx. 45 minutes at 20°C
Curing time: approx. 8 hours (tack-free)
Temperature resistance: 200℃ continuously / 300℃ for short periods
Food-safe: yes
Test certificate: TÜV SÜD rapport nr. 7216017173, gedateerd 15 juli 2026
Shelf life: 2 years (in unopened packaging)

Also available in other Shore hardnesses

Looking for a softer or firmer silicone rubber? RESION also offers the following 1:1 mix ratio variants:

• Shore A8 - very flexible
• Shore A25 - slightly flexible
• Shore A40 - hard and rigid

Buy silicone casting rubber for mould making

Order RESION Silicone Casting Rubber Shore A15 and other silicone rubber products easily from Polyestershoppen.com. Place your order on working days before 5:00 PM CET, and it will be dispatched the same day. If you have any questions about this product or would like advice on another application? Visit our information centre or feel free to contact one of our specialists.