Code 4101 applies to employers engaged in manufacturing blown sheet, window, polished plate, ribbed, rolled, colored, frosted, tinted, figured or wire glass.  Raw materials such as sand, limestone, borax, soda ash, wire mesh and colorings are received from others.  The materials are mixed and placed in furnaces where the mixture is melted to form molten glass.  The molten glass is then poured and blown by hand or by machine.  Molten glass passes through heated rolls to form polished plate or rolled glass. 

In the making of wire glass, wire mesh is placed in the middle of two layers of molten glass which is then rolled to form long sheets.  Once the sheets are cooled, they are then cut to the desired sizes.  Finishing operations may involve grinding, polishing and cutting.  The finished glass is then inspected, shipped or delivered to the employer’s customers.