![]() The most important ratio in an investment mix is the percentage of plaster by weight. I did not add alumina, but it is on the list of workable materials. I once did a lot of research in to investment recipes. Both of these are reasonable substitutes for silica flour in an investment recipe. Standard kilnwash is a 50/50 mixture of alumina hydrate and kaolin. It's the ratio of all three components, not just the amount of plaster, that's important. There are three components in a mold mix: Refractory filler, binder and additives. BE kilnwash also tints the face coat pink, which makes it easier to ensure that you've fully coated the mold with the next layer. In face coats, it does indeed facilitate release of the glass, especially in pate de verre molds. I don't add kilnwash to all mold mixes-it doesn't buy you much once you get past the face coat so it's a waste of money to use it anywhere else. I get the cleanest, clearest results with pieces made from a single billet, dripped into a pre-fired mold containing little or no silica flour. I've run over ten slumpson a single mold when bending stained glass panels for "Tiffany" replacements. This mix can be reused several times if kept below about 1450° F. It may not be "the best" mix, but the only exotic stuff is the shelf wash, which you should already have. ![]() ![]() To which I add about 5% kiln wash (Hot Line or Bullseye) (I also came across a much older post by 'mikefromitaly', on a different board, asking more or less the same question but not getting a clear answer.)ĭiatomateous Earth (swimming pool filter media from Walmart) I like the simplicity of Wallace Venables 2004 post and wonder if alumina hydrate could be substituted for the 5% KW but also wonder if the later posts are more reliable mixes? I like the idea of the mold having a 'built-in' release, that is not needing KW, and wonder if I'm dreaming. Please pardon the editing, but I excluded references to brand-name products as I'm looking for generic, readily-available products I can buy locally. I have narrowed the results down to the following excerpts. After several days reading everything I can find on mixes for reusable slumping molds, not necessarily deep casting, I am thoroughly confused. ![]()
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