CS25 Condensation Cure Silicone Rubber

Altiveneres' CS25 Condensation Cure Rtv Silicone Rubber is a low viscosity, two-part condensation cure silicone rubber. It is used for silicone mould making where it is mixed (with its catalyst) and then poured around a pattern to create a flexible silicone mould.

CS25 has been specially selected for its ease of use, excellent performance and great value.

Once cured the silicone rubber is very soft and flexible making it perfect for casting complicated or intricate shapes where the cast part can be easily removed from the silicone mould. The long pot-life of our silicone allows plenty of time for careful pouring and self de-gassing although forced degassing in a vacuum chamber can also be performed if required.

Typical Uses

The cured mold can then be used to produce precise replicas of the original part, including fine surface detail. A range of materials are suitable to use, including polyester, epoxy and polyurethane resin, urethane foam, wax, casting plaster, Jesmonite, and reconstituted stone. This Silicone should not be used with Water Clear Casting Resins such as the Water Clear Polyester or Polyurethane Resins as the inherent moisture content of this type of silicone can inhibit the curing of the resin. It can however be used with our GlassCast® clear epoxy range.

Advantages

• Easy to use - no special equipment or conditions required
• High tear strength and excellent elongation (making removal of even complex shapes from the mould easy)
• Good chemical resistance to styrene and polyurethane
• Low viscosity - fantastic flow properties
• Great value!

Further Information

Mixing Ratio

100 p.b.w. CS25 Condensation Cure Silicone Rubber
5 p.b.w. CS25 Condensation Cure Silicone Rubber Catalyst

Brief Description of Typical Use

A part to be copied is positioned within a 'setup box' which will contain the silicone rubber whilst it cures.

The silicone rubber is thoroughly mixed with its catalyst at the correct ratio by weight and then carefully poured all over the surface of the part to be copied (the master). Once the surface of the part is covered the remainder of the silicone is poured into the setup box. The silicone will cure at room temperature in around 24hrs. Once the silicone has cured it is removed from the setup box and then the flexibility of the rubber is used to allow removal of the part from inside the new silicone rubber mould.

An example of a simple mould pour using the CS25 can be seen in the following tutorial video:

How to Make a Silicone Mould

Compatibility Information - Dos and Don'ts

Although by no means an exhaustive list, the mould materials, pigments and additives listed below have all been tested and are known to work well with AS40 Addition Cure Silicone.

Compatible Moulds

• Almost all Plastic moulds
• Metal moulds
• Condensation Cure Silicone moulds with a release agent

Compatible Pigments

• RTV Silicone Colour Pigment (for vivid opaque colours)
• Translucent Tinting Pigment (for less vivid opaque colours)

Key Processing Information

• Ease of Use: Suitable for professional and hobby use (follow SDS advice).
• Odour: CS25 is almost odourless.
• Safety Precautions: Wear gloves and goggles and work in a well ventilated area. Always read the SDS before use.
• Ambient Conditions: Can be used from 10 to 30°C although pot-life and cure time will be affected significantly.
• Degassing: Although CS25 will self degas, we recommend degassing for the best results.
• Mix Ratio: Mix silicone and Catalyst 100:5 by weight. Use digital scales.
• Mixing: Mix thoroughly by hand for at around 2 minutes.
• Pot-Life: 60-90 Minutes. Be sure to pour your casting(s) before this time.
• Cure Time/Demould: Demould Time 24 Hours @ 25°C
• Shelf Life: 6 Months

Pack Size

Altiveners' CS25 Condensation Cure Silicone Rubber is available in the following pack sizes: 0.5kg, 1kg and 5kg. Please choose the pack size you require from the drop-down list. The 1kg kit is also included in the Xencast Resin Casting Starter Kit.

Specification