3M 02590 216U Series Abrasive Sheet Roll, 2-3/4 in W x 45 yd L, P400 Grit

Our 3M™ Stikit™ gold abrasive sheet rolls 216U features continuous lengths of A weight paper, easily cut to size to greatly reduce product waste. Aluminum oxide mineral abrasive delivers a sharp cut and uniform finish during collision repair. These sheet rolls feature Stikit™ adhesive backing, making them exceptionally fast and easy to attach and remove using power or hand sanding equipment.
3M Stikit coated sanding roll uses aluminum oxide as the abrasive material. 3M incorporates this aluminum oxide material into the sanding roll forming a grit of P400. The PSA attachment allows for easy mounting to the tool or pad. The sanding roll has a width of 2 3/4 in and length of 45 yd. This item is on a paper backing, A weight.
Specifications:

Abrasive Type: Coated

Specification parameters description:
Backing Weight:
Paper and cloth have a lettering scale for backing weight that measures strength of the material onto which the abrasive is mounted. Paper uses the letters A-F, where A is a lighter weight and most flexible and F represents a rigid, heavier backing. Lighter backings are typically paired with finer abrasive grits, suitable for blending and finishing. Coarser grits used for deburring and stock removal rely on a heavier backing. Cloth uses a lettering system of J, X, and Y for backing weight. J weight (jeans) is the lightest and most flexible, X weight (drills) is more durable and recommended for medium duty work, and Y weight is the toughest and least flexible. Fiber backings are made from chemically-impregnated paper to form a very hard, strong backing material. Fiber is used primarily for sanding discs. Polyester film backing provides high strength with a very thin backing and is used for very fine grits. It is more tear resistant than paper backing and is also waterproof.
Grade:
Grade is a measurement of the size of abrasive particles embedded in coated abrasives. It is a more general measurement of the level of precision, and corresponds roughly to grit. A smaller grit number means larger particles and a coarser grade, while high number grits are used for finer work.
Grit:
Grit is a measurement of the size of abrasive particles embedded in coated abrasives. The most common standards for grit size are the United States CAMI (Coated Abrasive Manufacturers Institute) and the European FEPA (Federation of European Producers of Abrasives). A smaller grit number means larger particles and a coarser grade, while high number grits are used for finer work. Grit is generally a unitless measure but is sometimes measured in microns.