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Heat Resistant RTV Silicone Rubber 0.5 to 5kg Kits

£19.99
(£23.99 inc tax)
10 days
Price in points: 1100 points
Reward points: 20 points
Weight: 2.25 kg per item
RTV-Heat Resistant
In stock
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Dow Silastic 3120 RTV Silicone Rubber for use with Low Melt Alloys, White Metal, Pewter, Lead and any hot casting media. Will tolerate up to around 300 Celsius, but the rubber should be post cure tempered to prepare it for the heat. Its full published temperature service range is -55 to 300!

Easy mix 20:1 Ratio, this compound will set fairly quickly, with extra catalyst will set faster. It is a very dense RTV with an SG of 1.45 so a kilo only represents around 0.65-0.7 litres. Bear this in mind during volumetric calculations.

Datasheets and Safety:
Please note that we no longer print and include datasheets with your order. All datasheets are available for download on the item where your purchase was made. It is the responsibility of the purchaser to download and read the information. Please think of the environment before deciding to print!
Mixing Guide:
Assess volume to fill in cubic centimetres Stir base component with a clean stainless steel spoon. Allow to stand to degass. Shake the catalyst. Again, allow to naturally degass. To convert to a weight, multiply weight by the SG. (Heat RTV =1.45) Weigh out Part A into a suitable container with room for mixing or degassing To calculate catalyst, divide the weight in grams by 20. 500g of Catalyst to each kilo is the right ratio Add the catalyst to the mixing pot and start your timer for potlife Stir Well! At least ONE minute, be mindful of potlife! Stand for one minute, again be mindful of potlife! Degass now if you wish Pour Demould at 8-12 hrs (or sooner if using a fast catalyst - please refer to the Technical Data Sheet) Please allow 48 hours to reach 99% cure before use, but mould may be used once demoulded, however its serviceable life will be shorter. If you mix a little short dont panic, mix a little more and pour it in to finish. Even if set, the RTV will stick to itself extremely well. This rubber should be tempered in an oven before exposed to high heat. Cook the rubber at 40 celsius for an hour and raise the temperature 40 degrees each hour. Process is complete when the max service temperature of 250 is held for one hour. Allow the oven to cool naurally, the mould is then ready for use.

Technical Data Sheet (Heat_RTV_TECH.pdf, 51 Kb) [Download]

Material Safety Data Sheet (MSDS / CoSHH) (Heat_RTV_MSDS.pdf, 35 Kb) [Download]

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