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  • Can I use Silicon Rubber on Glass?
    Silicone rubber cannot be moulded over glass, glass/ceramic mixes or silicone based sealant. The silica element in silicone rubber will bond tenaciously to these materials.
  • How to Extend the life of low-melt metal silicone rubber moulds?
    Very simply, dust the mould with talc or talcum powder to assist metal flow and, in turn, increase the life of the mould.
  • Is it possible to place spatula-thickened silicone rubber straight onto a pattern?
    Not really. For the best results you should brush on a layer of pre-mixed silicone rubber first - prior to any spatula application of a silicone rubber. Not taking this approach could result in air becoming trapped on the surface of the mould.
  • Can I use a release agent between silicone rubber pours?
    Yes - your best bet is Vaseline (petroleum jelly). It will need to be slightly warm before you brush it on.
  • what temperature can a normal silicone rubber tolerate?
    Generally, up to around 200°C. That said, however they can tolerate much higher temperatures if it's a one-off casting.
  • What temperature do low melt metal silicone rubbers tolerate?
    3D Freedom, for example, can tolerate up to around 280°C, or, again, much higher temperatures if it's a one-off casting.
  • Repairing a tear or filling a hole in a silicone rubber mould
    If your mould is damaged, you can use silicone glass sealant (the type of sealant used for windows).
  • Repairing a tear or filling a hole in a silicone rubber mould
    If your mould is damaged, you can use silicone glass sealant (the type of sealant used for windows).
  • What is the shelf life of Silicone rubber?
    The rule of thumb is roughly 12 months for both catalyst and rubber. Beyond this period, ageing may cause shorter pot life and silicone rubber can go 'lumpy'. As for silicone rubber moulds, once made, dust the mould with talc and, ideally, store the pattern in the mould - this will help to retain the mould's shape.
  • How to alter the hardness/shore rating of silicone rubber?
    To stiffen up the rubber, add (up to) 25% corn flour or silica flour. Bear in mind, though, that flex and elongation will be affected. In turn, you can add (up to) 10% silicone oil to soften the rubber. As for Shore strength, you can mix a different 'Shore strength' after you have catalysed each silicone with its own catalyst. In turn, the ratio between 'soft' to 'hard' silicone wil determine the final Shore Rating.
  • Silicone rubber setting too auickly while mixing and consequences
    If this is the case, you've possibly added too much catalyst. In turn, this can shorter the rubber's pot life. Another thing to remember is that this can weaken the mould cross-link, which, in turn, also reduces the mould's life.
  • How to cleaning up uncured silicone rubber
    A good 'citrus orange concentrate' solvent works very well.
  • Setting issues with silicone rubber
    It's possible that you haven't used enough catalyst. The other reason might be that the product is past its shelf-life. Temperature does not greatly affect the casting of conventional silicone rubbers, however high humidity which accelerate setting also shortening pot life.
  • Mixing silicone rubber catalyst
    Given that this is 'water clear', sometimes it's difficult to tell if you've mixed it well enough. In turn, add a drop of POLYTEK Polycolour liquid dye to your catalyst. This will give it a distinctive tint, so that, when it's added to the silicone rubber base, you'll be able to tell that it's mixed enough, as there will be no streaking left and the silicone will have a uniform, even colour.
  • Solid Mould 500, general purpose silicone rubber mould
    These are the only type of mould that are self-demoulding. Silicone does not require a demoulding agent, but because most resin systems are aggressive for the moulds, we recommend if more than a few parts are required from the mould, extend the mould life by assisting it with the occasional application of a release agent such as POLY-EASE 2300.
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