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- High tear strength
- Styrene and PU resistant
- Very low shrinkage
- Medium soft 23 Shore A hardness
- All kits supplied with hardener
- See table below for curing times
A simple 10% catalyst mixing ratio. Supplied as a kit including 1kg RTV 23 Silicone, and 100g RTV 23 Catalyst.
This material produces the highest quality rubber moulds with extremely fine detail and minimal shrinkage. They will produce hundreds of castings depending on the complexity of the shape. This self releasing liquid rubber is activated by the addition of a catalyst, poured over the former and cured at room temperature.
Available in a fast or slow kit, with or without Thixo. (Thickening agent to allow brush on application)
RTV 23 is a medium soft, condensation cured silicone
RTV + 10% catalyst   Pot Life/mins    De-mould/hrs    Full cure @20 degrees
Green (Slow)Â Â Â Â Â Â Â Â Â Â Â Â 120Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 20Â Â Â Â Â Â Â Â Â Â Â Â Â Â 7days
Yellow (Fast)Â Â Â Â Â Â Â Â Â Â Â Â 50Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 10Â Â Â Â Â Â Â Â Â Â Â Â Â Â 24 hours
RTV Silicone 1.1kg Kit
Price range: £36.00 through £48.99 Ex. VAT
We’ve tried loads of different silicones over the years and the saying “you get what you payed for” is 100% true when its comes to silicone quality.
This is without exception the best silicone we have found and have been using consistently for the past 15 years with all the moulds still going strong, while others made with inferior silicones degrading and falling apart within months.
- Medium soft 23 Shore A hardness
- High tear strength
- Styrene and PU resistant
- Very low shrinkage
- Available in Fast or Slow with or without Thixo (Thickening agent)
- Free UK shipping on all silicone kits

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