- Soak Times
Another element in slumping glass not formulated for kiln working is the annealing of the glass after the slumping. The annealing temperature can be estimated as 40C below a low temperature slump of a 280mm span of glass. The slump point test mentioned earlier will help determine the annealing point. You need to soak for a time - maybe 30 minutes - at the estimated annealing temperature and then cool slowly in case you have miscalculated on the annealing temperature. In any case, a long slow anneal cool will pay dividends in a more robust glass.
Remember TADSET - temperature, annealing, devitrification, soak, edges, test.