Code 4024 applies to employers engaged in manufacturing refractory bricks, clay products, earthenware, tile and other refractory products.  This classification includes shale, sand or clay digging for use in the employer’s own fabricated product.

The products may be manufactured from refractory clays with or without refractory materials such as magnesite, silica, bauxite and dolomite.  Refractory materials are grinded, screened, mixed and poured into molds and dried.  Once dried, the bricks or clay products are removed from the mold and baked in kilns.  For enameled brick, the bricks are dipped into enamels that contain chemicals, lead oxide, tin and salt and then baked two or more times to produce the enameled brick. 

This classification includes construction or reconstruction of sheds or kilns; clay, shale or sand digging; the manufacturing of common, face, pressed or repressed building or paving bricks; sand-lime bricks; structural, fireproof, drainage and roofing tiles; wall copings; glazed or unglazed sewer or drain pipes or conduits; or similar products.