asbestos products



What Is Asbestos?

Asbestos Products

Three-fourths of the world's supply of asbestos is mined in Quebec, Canada, and other large deposits are located in South Africa. Asbestos can be mined in various ways, but the most common method is open-pit mining. However, only 6 percent of the mined ore contains usable fibers. The fibers are split from the ore by crushing, air suction, and vibrating screens. During that process they are sorted into different lengths, or grades. The Quebec Standard Test Method is the most widely used method of grading. It divides the fibers into seven groups, the longest in Group One and the shortest, called milled asbestos, in Group Seven. The length of the fibers and its chemical composition determine the kind of product that can be made out of the asbestos. The longer fibers are used in fabric, usually with cotton or rayon, and the shorter ones for molded materials, such as pipes and gaskets.

Asbestos has been used in various products since the 1900s, but the peak usage years were between 1950 and 1975. It was considered an ideal material to use, since it resembles fibers such as cotton and wool in its pliability and softness, yet it is inflammable and acid resistant.

Because of its cloth-like qualities, it can be woven and spun into fireproof garments. It was once used to create fireproof protection for firefighters and other people who worked with high heat. Asbestos was also used in gas masks. It could be woven into sheets to act as insulation and thermal proofing for pipes, boilers, and electrical products.

It could be spray applied as fireproofing as well. It coated brake linings and clutch pads, and other friction materials (because friction causes heat).

It was used in an array of construction materials. Asbestos was included in cement pipes, packing, jointing, gaskets, floor and ceiling tiles, paneling, roofing shingles, asphalt coats and sealant, and acoustical and decorative applications.

Here is a list of common asbestos products:

(List reproduced from the Alberta Asbestos Abatement Manual (pdf - 1.15 MB), August 2001)