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.) Car redirects here. ... The driver of this DAF tractor with an auto-transport semi-trailer truck prepares to offload Škoda Octavia cars in Cardiff, Wales For other meanings, see Truck (disambiguation). ... Tires may refer to: the plural of tire the Italian name for Tiers, Italy, a town in South Tyrol, Italy Category: ... The old steel cable of a colliery winding tower Steel is a metal alloy whose major component is iron, with carbon content between 0. ... Cryogenics is a branch of physics (or engineering) that studies the production of very low temperatures (below –150 °C, –238 °F or 123 K) and the behavior of materials at those temperatures. ... The term screen has a number of meanings: A window screen is a wire mesh that covers a window opening to keep out insects even when the window is open. ...

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.

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.