Sand Mold Basics - WarmGlass.com

Post by twin vision glass » Sat Jan 19, 11:11 pm

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-Just for the sake of it think of 100 pounds of Silica Sand (or better yet, olivine if you can find it) Play sand is dirtier but you can burn it out if you must BUT best to use 2 grids so sand settles well. . (80 girt and 120 grit ) the finer the sand the less it breaths and can cause bubbles if toooo tight.
Then add 5 % percent Bentonite and 10 % percent #1 Pottery Plaster. Mix to the point that you can press your hand into the mold mix and come out with a perfect hand , or pick some up squeeze, and throw ball up in air, if it stays together you are ready to go. If NOT add more plaster and abit more bentonite. ********* No water for Kiln casting
-Then when you have your images pushed into sand (use white TALC powder from the Potter Supply store ) and dip your image into it. Tap into sand , then do again and tap into sand , and so on until design is figured out and you are happy . Push small finished glass pieces in toooo if you want to BUT have them ground as anything pushed into sand will not soften the edges so if it is sharp, it will be sharp. AFTER you have desired look, sprinkle TALC onto sand or rather sift so NO sand can be found but make sure you do not cover the ends of glass impressions or it will not melt to larger cast piece. So there we go. Any other questions please ask. I used to do alot of kiln sand casting. If my mix is right and set up is right, THEN you can lay up to 100 pounds of glass onto this mix. BUT I usually design with Fiber pieces at each corner that will stick up higher than my image design so I do not flatten my design when I start to load glass. That is how the piece above was made. I also have mold mix 6 molds in the design as well , but that is another story. It gives such fine lovely detail BUT the release from the glass is primer on mold mix 6 and dried out before loading as apposed the the TALC on the sand. You do not want Talc on Mold Mix 6 or you get tiny tiny bubbles. Also SILVER irridescent also can cause some bubble issues with talc and mold mix 6 . Irri glass also is a GREAT release with the Talc.
Leslie



http://i228.photobucket.com/albums/ee40 ... G_.jpg

Quick Question. Are you kiln casting or Hot casting. I have had wonderful fun with both : http://www.twinvision.fusedglassartists ... ndles1.jpg This piece was done in the kiln in sand mixture of :-Just for the sake of it think of 100 pounds of Silica Sand (or better yet, olivine if you can find it) Play sand is dirtier but you can burn it out if you must BUT best to use 2 grids so sand settles well. . (80 girt and 120 grit ) the finer the sand the less it breaths and can cause bubbles if toooo tight.Then add 5 % percent Bentonite and 10 % percent #1 Pottery Plaster. Mix to the point that you can press your hand into the mold mix and come out with a perfect hand , or pick some up squeeze, and throw ball up in air, if it stays together you are ready to go. If NOT add more plaster and abit more bentonite. ********* No water for Kiln casting-Then when you have your images pushed into sand (use white TALC powder from the Potter Supply store ) and dip your image into it. Tap into sand , then do again and tap into sand , and so on until design is figured out and you are happy . Push small finished glass pieces in toooo if you want to BUT have them ground as anything pushed into sand will not soften the edges so if it is sharp, it will be sharp. AFTER you have desired look, sprinkle TALC onto sand or rather sift so NO sand can be found but make sure you do not cover the ends of glass impressions or it will not melt to larger cast piece. So there we go. Any other questions please ask. I used to do alot of kiln sand casting. If my mix is right and set up is right, THEN you can lay up to 100 pounds of glass onto this mix. BUT I usually design with Fiber pieces at each corner that will stick up higher than my image design so I do not flatten my design when I start to load glass. That is how the piece above was made. I also have mold mix 6 molds in the design as well , but that is another story. It gives such fine lovely detail BUT the release from the glass is primer on mold mix 6 and dried out before loading as apposed the the TALC on the sand. You do not want Talc on Mold Mix 6 or you get tiny tiny bubbles. Also SILVER irridescent also can cause some bubble issues with talc and mold mix 6 . Irri glass also is a GREAT release with the Talc.Leslie http://www.twinvision.fusedglassartists ... sting.html here we are casting into Olivine sand and bentonite and water with Acetaline Torch to carbon sand http://i228.photobucket.com/albums/ee40 ... /Scan1.jpg (hot cast into Olivine Sand at Pilchuck) http://i228.photobucket.com/albums/ee40 ... G_.jpg This is hot casting into DRY mix at Pilchuck because I am also hot casting into the mold mix 6 mold with Uroboros glass Powders . Our release for Hot Casting into Mold Mix 6 was different than kiln casting with it as the spray Graphite was not good for kilns but Boron Nitride did work with hot casting for a release on the Mold Mix 6. So many years experimenting and so many projects learned the hard way.

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