Washington Administrative Code › Title 296 - Labor and Industries, Department of › Chapter 296-17A - Classifications for Washington workers' compensation insurance › Section 296-17A-3501 - Classification 3501

Current through Register Vol. 24-14, July 15, 2024
3501-00 Brick or clay products, N.O.C:
				Manufacturing
Applies to establishments engaged in the manufacture of brick
				or clay products not covered by another classification (N.O.C.), such as, but
				not limited to, drainage or roofing tiles, building or paving bricks, wall
				copings, glazed or unglazed sewer or drain pipes or conduits, or similar
				products which are generally for industrial or construction use. Clay, which is
				any earth that forms a paste when added to water and hardens when heated, is
				widely used in making bricks and other products as described above. Brick is a
				molded rectangular block of clay, baked by the sun or in a kiln until hard.
				Similar products made of earthenware, which is a variety of coarse, porous
				baked clay, are included in this classification. To make bricks, clay is broken
				up by dry-pan grinders. After grinding, the particles pass through any one of
				several types of screens used for separating and grading. The mixture is fed
				through a pug mill to be cut and mixed then mixed with water to the desired
				consistency. After tempering, the pug mill extrudes a column of clay through a
				die, which shapes and determines the dimensions of the brick. A rotating wire
				cutter slices the column into proper thicknesses. Bricks are either machine
				molded or hand molded. The "green" bricks must be dried by sun and air, or in
				natural gas or electric-fired regulated kilns prior to firing. Firing
				dehydrates, oxidizes, and vitrifies the bricks. To make other products, clay is
				mixed with sand or shale, ground in a mixing machine and water is added. The
				liquid substance is mechanically poured into standard or specially shaped
				molds. All products are dried by natural warm air or steam heat. After removal
				from the molds, products are baked in kilns. If glazing is desired, salt is
				added to the kiln; the salt vaporizes and coats the products. To produce a
				greater degree of concentration, pressing or repressing operations may be
				performed, usually with hydraulic presses, subsequent to the actual formation
				of the products.
This classification excludes the production of raw materials
				which is to be reported separately in the applicable mining, quarrying or
				excavation classification; installation or erection of any products
				manufactured by establishments in this classification which is to be reported
				separately in the classification applicable to the type of construction or
				installation work being performed; the manufacture of household or decorative
				pottery items, including tile, which is to be reported separately in
				classification 3503; and the manufacture of statuary and ornamental items from
				concrete or plaster which is to be reported separately in classification
				3509.
Special note
:
Clays are generally
				mined by the open-pit method. After clay has been extracted, it may be
				stockpiled inside for use during inclement weather. In most cases, the
				manufacturing of brick takes place alongside the extraction site. Clay is
				delivered to the manufacturing site only when clay of a different
				characteristic is needed to blend with the "home" clay.
3501-01 Refractory products: Manufacturing
Applies to establishments engaged in the manufacture of
				refractory products such as, but not limited to, fireproofing tile or bricks,
				roofing tile, flue lining, boiler or stoker tiles, enameled bricks, retorts,
				kiln parts, or crucibles from refractory clays with or without other refractory
				materials. Refractory clays are resistant to heat. Refractory materials, such
				as alumina, silica, and magnesite, dolomite, bauxite, do not significantly
				deform or change chemically in high temperatures. Usually all types of
				refractory products are produced in the same plant. Clay and other materials
				are ground, screened and mixed with water in a mixing machine. The partly fluid
				substance is poured into molds to form the product. After removal of the forms,
				items are kiln dried. The enamels are vitreous coatings produced from solutions
				of chemicals, salt, lead oxide or tin, into which the brick is dipped. Enameled
				brick requires two or three kiln burns.
This classification excludes the production of raw materials
				which is to be reported separately in the applicable mining, quarrying or
				excavation classification; installation or erection of any products
				manufactured by establishments in this classification which is to be reported
				separately in the classification applicable to the type of construction or
				installation work being performed; the manufacture of household or decorative
				pottery items, including tile, which is to be reported separately in
				classification 3503; and manufacture of statuary and ornamental items from
				plaster or concrete which is to be reported separately in classification
				3509.
07-01-014, recodified as § 296-17A-3501, filed 12/8/06,
				  effective 12/8/06. Statutory Authority:
				  RCW
				   51.16.035. 98-18-042, § 296-17-586,
				  filed 8/28/98, effective 10/1/98; 96-12-039, § 296-17-586, filed 5/31/96,
				  effective 7/1/96; 85-24-032 (Order 85-33), § 296-17-586, filed 11/27/85,
				  effective 1/1/86; 83-24-017 (Order 83-36), § 296-17-586, filed 11/30/83,
				  effective 1/1/84; 82-24-047 (Order 82-38), § 296-17-586, filed 11/29/82,
				  effective 1/1/83; Order 73-22, § 296-17-586, filed 11/9/73, effective
				  1/1/74.