Closure for silica glass crucible, silica glass crucible and method of handling the same
A closure for silica glass crucible to be mounted on an opening portion of a silica glass crucible is provided with a peripheral edge mounting portion closely adhered to an inner peripheral end of the opening portion.
1. A method of handling a silica glass crucible during the production of single crystalline silicon, comprising mounting a closure onto an opening portion of a silica glass crucible over a waiting period after polycrystalline silicon is charged into the silica glass crucible until melting of the polycrystalline silicon;
wherein the closure is a closure for the silica glass crucible sized and configured to be sealably mounted on the opening portion of the silica glass crucible, the closure comprising a peripheral edge mounting portion sized to closely adhere to an inner peripheral end of the opening portion;
wherein the closure is made from a flexible material so that the closure is mountable to the silica glass crucible by a restoring force of the closure after deflection in a radial direction thereof.
2. The method of claim 1 , wherein an amount of metal components at least adhered to an inner face of the closure is not more than 0.05 ng/cm 2 .
3. The method of claim 1 , wherein the closure further comprises a flange portion extending outward from the peripheral edge mounting portion in a radial direction.
4. The method of claim 1 , wherein the closure comprises an identifier.
5. The method of claim 1 , wherein at least a part of the closure is transparent.