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Crumb rubber

Crumb rubber is generally manufactured from automotive and truck scrap tires. During the manufacturing process steel and fluff is removed leaving tire rubber with a granular consistency. Continued processing with a granulator, cracker mill, possibly with the aid of cryogenics, reduces the size of the particles further. The particles are sized and classified based on various criteria including color (black only or black and white), magnetically separated, and removal of fluff. The granulate is sized based on a passing through a screen with a size based on a dimension (1/4") or mesh (10, 20, etc.)

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Mesh refers to material that has been sized by passing through a screen with a given number of holes per inch. For example, 10 mesh crumb rubber has passed through a screen with 10 holes per inch resulting in rubber granulate that is slightly less than 1/10th of an inch. The exact size is based on the size of wire used in the screen.

Rubberized asphalt is the largest market for crumb rubber in the United States, consuming an estimated 220 million pounds, or approximately 12 million tires annually.^[1] Crumb rubber is also used as ground cover under playground equipment, and as a surface material for running tracks and athletic fields.^[1]

Description of crumb rubber grading:

The following are common classifications of crumb rubber:

Retreaders Tire Buffings shall consist of clean, fresh, dry buffings from tire retread preparation operations.

No.1 - Tire Granule shall consist of granulated tire crumb, Black Only Guaranteed MetalFree, sized. Magnetically separated materials are not acceptable. Fluff from tire cord removed.

No.2 - Tire Granule shall consist of granulated tire crumb, Black & White Guaranteed MetalFree, sized to minus 40 Mesh. Magnetically separated materials are not acceptable. Fluff from tire cord removed.

No.3 - Tire Granule shall consist of granulated tire crumb, Black Only Magnetically Separated, sized. Fluff from tire cord removed.

No.4 - Tire Granule shall consist of granulated tire crumb, Black & White Magnetically Separated, sized. Fluff from tire cord removed.

No.5 - Tire Granule shall consist of unclassified granulated tire crumb, Sized, Unseparated, not magnetically separated, fluff from tire cord not removed.