Slumping

Slumping is a technique in which items are made in a kiln by means of shaping glass over molds at high temperatures.The slumping of a pyrometric cone is often used to measure temperature in a kiln. Slumping is a technique in which items are made in a kiln by means of shaping glass over molds at high temperatures.The slumping of a pyrometric cone is often used to measure temperature in a kiln. Slumping glass is a highly technical operation that is subject to many variations, both controlled and uncontrolled. When an item is being slumped in a kiln, the mold over which it is being formed (which can be made of either ceramic, sand or metal) must be coated with a release agent that will stop the molten glass from sticking to the mold. Such release agents, a typical one being boron nitride, give off toxic fumes when they are first heated and must be used in a ventilated area.