Perlite is a volcanic rock formed when lava (molten rock) spews out of a volcano and cools in a rapid manner. Because of rapid cooling, water is trapped within the rock, and the lava forms into a glass-like structure.
There are many types of sand that one can use in moulding applications, from natural sands to man-made sands (such as ceramic sand). The purpose of sand as a moulding medium is to act as a good medium for high bonding mould strengths as well as provide a high refractoriness against heat. As a result, there will be fewer casting-related defects due to low refractoriness of the virgin sand.
South Africa is a country rich in mineral resources, one such mineral resource is foundry chrome sand. Optichrome foundry sand is a product designed to specifically to meet the stringent standards within modern foundries.
As Chinese authorities continue the clampdown on polluting industries to clean up local operations, the focus is shifting to magnesia processors. After the rapid downfall in magnesia prices out of China following the scrapping of the quota system, some suggest the downtrend may be reversed if the shutdowns lead to a supply shortage