Kiln formed glass with Kirstie Rea - 10

Slumping (sagging, bending) and block stack. for Bullseye/Spectrum glass.

The golden rule in slumping is "stay lower longer". Slumping takes place at a lower temperature than a full fuse, though higher temperatures will pick up more mould detail.

The thicker the glass the lower the temperature (weight does it for you) Temp range 590-670C.

Hold range 10-20 minutes..if it's not working..hold temp for longer before going up.

annealing schedule is the same as fusing and remember all kilns are different.

 Primer / release / batwash

50% Kaolin 50%  alumina hydrate

Whiting is Calcium carbonate.

 

Material	Product ex.	Pros	Cons	Release / primer
Stainless steel	Woks, sheet metal, found objects, corrugated sheets	Lasts for a long time		Must	Warm metal in sun, thin mix with metho. Liquid dries on application.
mild steel	Found objects		Flakes disintergrates over time and corrodes	Must	“” as above
Aluminium		Melts at a low temp – do not use
Galvanized metal		Gal finish is toxic – do not use
Cast iron		Probable thermal shock use with caution
plaster / silica	Hand made moulds 1:1:1 Plaster:silica:water	Comes in any shape you make No primer needed Use over and over	Must pre fire	None
ceramics	Bisque fired (1000deg) objects or moulds, clay pipes. Glazed homewares (sandblast off glaze then prime)	Pre made moulds very available Specifically for glass and as production items.		Must
Ceramic Fibre products	(fibre board blanket, paper)			Can	to prolong the life of add rigidity to product
Fire bricks	Insulation bricks	Carvable (hacksaw etc)		Must
concrete			Due to air inside would probably explode

Today's prac was a block stack (not a technical term I assure you)....these are the stages of layers, have to wait till monday before I can see the result.