Please help improve this section by adding citations to reliable sources. The harder the backing material, the faster the sanding, the faster the wear of the paper and the rougher the sanded surface. Stronger paper or backing increases the ease of sanding wood. Sandpaper backings may be glued to the paper or form a separate support structure for moving sandpaper, such as used in sanding belts and discs. A flexible backing allows sandpaper to follow irregular contours of a workpiece relatively inflexible backing is optimal for regular rounded or flat surfaces. Letter nomenclature follows a different system for cloth backings, with the weight of the backing rated J, X, Y, T, and M, from lightest to heaviest. For paper backings, the weight ratings range from "A" to "F", with A designating the lightest and F the heaviest. The weight of the backing is usually designated by a letter. Fibre or vulcanized fibre is a strong backing material consisting of many layers of polymer impregnated paper. Cloth backing is used for sandpaper discs and belts, while mylar is used as backing for extremely fine grits. In addition to paper, backing for sandpaper includes cloth ( cotton, polyester, rayon), PET film, "fibre", and rubber. Coated abrasive ģ20 grit silicon carbide sandpaper, with close-up view Its first application was in automotive paint refinishing. This allowed use with water, which would serve as a lubricant to carry away particles that would otherwise clog the grit.
In 1921, 3M invented a sandpaper with silicon carbide grit and a waterproof adhesive and backing, known as Wet and dry. Cheap sandpaper was often passed off as glass paper Stalker and Parker cautioned against it in A Treatise of Japaning and Varnishing published in 1688. Glass frit has sharp-edged particles and cuts well whereas sand grains are smoothed down and do not work well as an abrasive. Glass paper was manufactured in London in 1833 by John Oakey, whose company had developed new adhesive techniques and processes, enabling mass production. Boiled and dried, the rough horsetail plant is used in Japan as a traditional polishing material, finer than sandpaper.
#120 grit sandpaper skin#
Shark skin ( placoid scales) has also been used as an abrasive, and the rough scales of the Coelacanth are used for the same purpose by the natives of Comoros. The first recorded instance of sandpaper was in 13th-century China when crushed shells, seeds, and sand were bonded to parchment using natural gum. A small number such as 20 or 40 indicates a coarse grit, while a large number such as 1500 indicates a fine grit.
The grit size of sandpaper is usually stated as a number that is inversely related to the particle size. Sandpaper is produced in a range of grit sizes and is used to remove material from surfaces, whether to make them smoother (for example, in painting and wood finishing), to remove a layer of material (such as old paint), or sometimes to make the surface rougher (for example, as a preparation for gluing). "aluminium oxide paper", or "silicon carbide paper". It is common to use the name of the abrasive when describing the paper, e.g. In the modern manufacture of these products, sand and glass have been replaced by other abrasives such as aluminium oxide or silicon carbide. There are many varieties of sandpaper, with variations in the paper or backing, the material used for the grit, grit size, and the bond. Sandpaper and glasspaper are names used for a type of coated abrasive that consists of sheets of paper or cloth with abrasive material glued to one face. Sheets of sandpaper with different grit sizes (40 (coarse), 80, 150, 240, 600 (fine)).
0 kommentar(er)
