The silica was extracted to make firebricks at the "Dinas Firebrick Co." in Pont Walby. Refractory materials such as firebrick, castable refractories and ceramic fibre, are used for insulation. Kilns lined with firebrick, with stone lined tunnels and iron doors. The rotary kiln consists of a tube made from steel plate, and lined with firebrick. The ovens themselves are in diameter, with sandstone exteriors and firebrick interiors. The brick-built setting was replaced with a box-like steel housing, lined with firebrick. Its distinguishing feature was a firebrick wall two-thirds of the way down the furnace. This stove used firebrick as a storage medium, solving the expansion and cracking problem. The ground was donated by the Silica Firebrick Company in 1921. Use of firebrick as a lining at the back suggest treatment for higher temperature there. Ang Thong native handicrafts include moulded court dolls, firebrick, and wickerwork. A small forge can even be carved out of a single soft firebrick. Salina was constructed by the Kier Firebrick Company to house employees of the firm. It is named after William Tandy Christy, a businessman who founded a firebrick company. Kelley took some of this dust and placed onto a firebrick.