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Recently I attempted to do some metal casting using the typical blue molding material that is available through Micro-Mark. Needless to say, the hot metal burned the mold (and stunk to high heaven) and was less than an accurate copy of the item I was attempting to copy. Looking around, it seems that I can only locate molding material that is appropriate to Resin (and ULTRA low melting point metals). Back in the mid-90’s there was a red colored molding material that was making the rounds through the hobby that could handle higher heat, but I have no clue where to obtain it (or if it is still even available). Does anyone know where I can obtain some, or even what it is called?

It's a silicon compound, we used to use it where i used to work making fibreglass products. It doesn't necessarily withstand greater heat, it can withstand more pressure though.

Best option for metal casting is metal moulds, they are about the only thing that will with stand the heat you are generating, that's why pewter casting gets pricy.

There are often alot of people who are in the jewellery industry or trophies or something who can cast for you for a ofte nominal fee.

Winter wrote:It's a silicon compound, we used to use it where i used to work making fibreglass products. It doesn't necessarily withstand greater heat, it can withstand more pressure though.
There are often alot of people who are in the jewellery industry or trophies or something who can cast for you for a ofte nominal fee.

Possibly, but when I asked my buddy who has several of the molds (but cannot recall where he got the molding material from), he indicated that they never charred.

I am loathe to go through someone else for this project, but unless I can find some rubber I will have to.

I finally signed up to dakka dakka after lurking for a fair while to post a reply for you!

This is basically what your after but not neccesarilly the cheapest supplier, maybe TOMPS are better but hey

http://www.tiranti.co.uk/subdivision_product_list.asp?Content=RTV-101+Silicone+Rubber+-+Silicone+Rubber+-+Mouldmaking&Subcategory=51&Subdivision=173

Dead easy to use, and they do a little set with instructions which is worth getting. Have fun

You need a heat resistant silicon rtv. You'll have to look through the lists of what's available. I don't buy mine online - I go to my stockist and browse his catalog.

Dow Corning used to do one (used to be the one I used) until it became unavailable for one reason or another.

The red one I use is suitable for bronze casting, so it can handle pewter no problems (lower melting point).