Roman Posted April 18, 2018 Share Posted April 18, 2018 Hi, Looking for some advice on material selection. I want to cast some rubber, so needs to be pourable. But I want maximum elongation ability (So you can stretch it like a balloon kinda thing) and then some degree of resistance to heat, oil and petrol. Any thoughts on what would be best? The castings wont need to be super thin, or thick - Have some degree of freedom to best suit the material. I can see you can get polyurethane with a very low shore hardness. But would something like latex be better? Thanks Quote Link to comment Share on other sites More sharing options...
peteretep Posted April 18, 2018 Share Posted April 18, 2018 Whenever I talk to people at work regarding this, they always push me towards urethanes, especially when pils are concerned. Plus Plastics and Hammerking are our typical suppliers/do our molds. I would give them a call, they are both fairly helpful Otherwise, if you wanted to talk to someone about rubber, we used to use Skellerup for rubber stuff 1 Quote Link to comment Share on other sites More sharing options...
Roman Posted April 18, 2018 Author Share Posted April 18, 2018 Thanks! Quote Link to comment Share on other sites More sharing options...
ajg193 Posted April 18, 2018 Share Posted April 18, 2018 Will silicone not do what you want? Quote Link to comment Share on other sites More sharing options...
Roman Posted April 18, 2018 Author Share Posted April 18, 2018 I guess so, not very pourable though? Was hoping for something that starts out reasonably liquid-ey. Quote Link to comment Share on other sites More sharing options...
ajg193 Posted April 18, 2018 Share Posted April 18, 2018 Pretty sure you can get castable silicone. People use it to make moulds of light lenses and stuff all the time. These guys might have what you need: https://www.fibreglassshop.co.nz/collections/silicones-rubbers-mould-materials 1 Quote Link to comment Share on other sites More sharing options...
ajg193 Posted April 18, 2018 Share Posted April 18, 2018 https://www.fibreglassshop.co.nz/collections/silicones-rubbers-mould-materials/products/siliconethinner?variant=33286656385 Looks like a casting urethane: http://issuu.com/fibreglassshop/docs/vytaflex_series_tb_1_?e=18238779/14364897 https://www.fibreglassshop.co.nz/collections/silicones-rubbers-mould-materials/products/vytaflex-polyurethane-rubber 1 Quote Link to comment Share on other sites More sharing options...
Roman Posted April 19, 2018 Author Share Posted April 19, 2018 Thanks @nzed, I'll give them a buzz. 1 Quote Link to comment Share on other sites More sharing options...
MaxPower Posted April 19, 2018 Share Posted April 19, 2018 https://www.ebay.com/itm/Clone-A-Willy-DIY-Make-Your-Own-Vibrating-Dildo-Penis-Cock-Mold-Copy-At-Home-Kit-/201309521848 this stuff is pretty flexible 4 2 Quote Link to comment Share on other sites More sharing options...
kicker Posted April 19, 2018 Share Posted April 19, 2018 There is a cat on here who works with similar stuff I think, remember something about bump stops, nvmyvl? Quote Link to comment Share on other sites More sharing options...
Mr Vapour Posted April 19, 2018 Share Posted April 19, 2018 50 minutes ago, kicker said: There is a cat on here who works with similar stuff I think, remember something about bump stops, nvmyvl? correct nvmyvl Quote Link to comment Share on other sites More sharing options...
nvmyvl Posted April 20, 2018 Share Posted April 20, 2018 Yeah I used to work for a company that specialized in polturethane. Problem with polyurethane is that heat and oil/grease can break it down quite quickly. Plus the lower the shore hardness, the softer it is, so it becomes easier to tear. The sheer strength disappears. Elasticity is still there tho. Also, you would have to send your parts in to be made. Supply a mould etc, as nobody will supply the raw materials for you. The curative is a massive carcinogen. And very explosive. Plus for the lower shore hardness grades, there is s 16+ hour cure time at 90 deg C. Silicone and latex are both pourable at home, but I would say that they will have the same problems as low shore hardness polturethane. Poor strength. I would go see Steve a Plus Plastics in East Tamaki and have a chat to him. He's a bloody good guy and probably the most knowledgeable in the field. I used to work with him, and i still send all my work to him, even tho I worked for his opposition. Any other questions, the dont hesitate to ask. Cheers Blair 3 Quote Link to comment Share on other sites More sharing options...
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