With slumping we lower a piece of flat glass into a mold. The glass is heated in the oven until it softens and begins to deform. It sinks into the mold under its own weight and takes the shape of the mold. Forming glass over a mold is called draping.
With slumping we use molds. Usually a mold is made of a mixture of plaster, quartz and water (possibly chamotte as well). Molds can be reinforced with fiberglass or wire. You can make a mold with us under the guidance of an advisor. We have all materials in stock for this.