AMACO High Fire Moist Non Toxic Stoneware Clay, 50 lb, Buff No. 46, Brown 45083X

Is 47 the old #48 stoneware?

I have never worked with clay and am looking to buy this for my daycare children. Can this clay be used over and over?

Is this clay Cone 10?

Can this be used to make a mold for glass slumping? (1200 to 1300 deg F)