justanassembler Posted February 10, 2014 Report Share Posted February 10, 2014 Hey, I was wondering if anyone had in their files a copy of Jerry's no-shrink clay body recipe? I seem to remember it being in an issue of CM a number of years back, but can't for the life of me find it... Thanks in advance, Michael Link to comment Share on other sites More sharing options...
Norm Stuart Posted February 10, 2014 Report Share Posted February 10, 2014 Clay, lignite (aka soft coal) and fiberglass sounds like you'd have to use gloves to fashion your ware and a respirator once your clay starts to become dry. Pyrax (pyrophylite) irreversibly expands when fired. When mixed with clay the combined effect is a clay which doesn't shrink when fired. Other ceramic ingredients which expand when fired are the lithium feldspar Spodumene, and specialty grogs Kyanite and Mulllite. http://www.grandcentralartcenter.com/press_2003_12_1.php Link to comment Share on other sites More sharing options...
neilestrick Posted February 10, 2014 Report Share Posted February 10, 2014 I think I'd go with a Spodumene body like a flameware before I used that stuff. Link to comment Share on other sites More sharing options...
timbo_heff Posted February 11, 2014 Report Share Posted February 11, 2014 Here's some info that supposedly came from the VC hand book VC Sculpture Body cone 04 - 6 Also add: Red Iron Ox2Narco Fire Clay 10 For more plasticity,AP Green Fire Clay 10Hawthorn 7 Macaloid2Lizella 3Fibrous Wollastonite 15 More dry strength,add nylon fiberCoarse Grog 25Medium Grog 5Fine Grog 20Calcined Alumina 5Not very plastic, but can be modeled and shaped fairly well. not ZEROshrinkage, but very low.ZERO SHRINKAGE CLAY BODY:50% coarse grog (4-16 mesh)10% medium Grog (20-36 mesh)40% fine grog (40-60 mesh)Lightly coat these particles with a deflocculated clay slip. This slipshould haveno more than 25% water. (Think of a chocolate coated raisin)Firmly pack into-around shape. The more firmly packed, the better.Press clay into whatever voidss may be left in and around the particles.Dry and fire ---zero shrinkage.The mixture of coarse, medium, fine grog particles is critical to the body.This is the standard used by industry in making heavy refractories whereminimum shrinkage is critical.(From Cushing Handbook). Link to comment Share on other sites More sharing options...
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