![]() Sanding appliances often call for a fraction of a sheet, and the fractional sizes are available.ĭiameters of 6″, 8″, 9″, 10″, 12″, and 15″. The standard sheet of sandpaper is 9 by 11 inches. Sandpaper is available in a wide variety of forms: Sheets ![]() Weight is usually found only in heavy duty industrial applications. Weight is used when the sandpaper must conform to curved surfaces, and the Y The A and B weights are used for finishing papers, C and D are general purpose weights, D and E are suitable for machine sanding, and F is used for belts.Ĭloth backings are made in J, X, and Y weights, with Y the heaviest. Paper backings are made in grades A through F, with F being heaviest. BackingĪn abrasive “paper” may be backed with either paper, cloth or a ![]() The glue used in light duty papers is not waterproof. The grains of abrasive are held on the backing by glue, resin, or a combination of the two. Because it can leave a deposit, stearated paper should not be used if a water-based finish will be applied. Such paper is useful for sanding resinous woods and some finishes. Some paper is treated with a soap-like substance to reduce clogging (“ stearated” or “ nonclog” sandpaper). Wood is best sanded with open coat paper. Paper it covers 50% to 70% of the surface, the advantage being that the paperĭoesn't clog as easily. The grit covers 100% of the surface on open-coat The abrasive may be any of the materials listed below. The remaining grades are used mainly in finishing metal and are most easily found at automotive supply stores.ġ000 to 1500 are used in rubbing out lacquer finishes on wood. Many workers feel 180 is as fine a grade as need be used on raw wood that is to be varnished or lacquered.Ĭoarsest grade used to sand grain raised by stain.įinest grit available in stearated paper. CAMIĬoarsest grade needed in finishing surfaced lumber. But the CGPM, the controlling authority for SI, says microns should be called micrometers. In the abrasives industry, particle size is typically expressed in microns. See the Standards section below for sources of detailed information. In F220 (a “microgrit”), no more than 3% can be larger than 75 microns, at least 50% must be in the range 50.0 to 56.0, and at least 94% must be larger than 45 microns. For example, by the FEPA standard for macrogrits grade F180, no more than 3% by mass of the grit can have a particle size larger than 90 microns, and at least 94% must be larger than 53 microns. The two systems are not strictly comparable, because FEPA defines a grade by specifying a range of grain sizes, while CAMI specifies an average particle size. Worldwide, the FEPA system is more common. There are several standards for coated abrasives, but by far the most commonly used are those of the Coated Abrasives Manufacturer's Institute (CAMI) and the Federation of European Producers of Abrasives (FEPA).
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