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30-417: The sandpaper figs are so named for their leaves, which are rough and sandpaper -like in texture. The common name may refer to a number of species in the genus Ficus : Australian species: Others: Sandpaper 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 is produced in a range of grit sizes and

60-440: A cloth backing. It is used for hand metalworking. It may be sold in sheets or in narrow rolls, typically 25 or 50 mm wide, often described as "emery tape". The cloth backing makes emery cloth stronger in tension than paper, but still allows a sheet to be conveniently torn to size. Emery (largely displaced by improved products such as aluminium oxide and silicon carbide) is used for scrubbing highly abraded and rough surfaces to

90-475: A coarse grit, while a large number such as 1500 indicates a fine grit. The first recorded instance of sandpaper was in 13th-century China when crushed shells, seeds, and sand were bonded to parchment using natural gum . 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 . Boiled and dried,

120-432: A millimetre or one billionth of a metre ( 0.000 000 001  m ). The micrometre is a common unit of measurement for wavelengths of infrared radiation as well as sizes of biological cells and bacteria , and for grading wool by the diameter of the fibres. The width of a single human hair ranges from approximately 20 to 200 μm . Between 1 μm and 10 μm: Between 10 μm and 100 μm: The term micron and

150-500: A shift to other forms of abrasive, such as aluminium oxide , aluminium zirconia and silicon carbide . Emery is rated on the average grit size, glued to the backing. Common sizes are, from coarse to fine: 40, 46, 54, 60, 70, 80, 90, 100, 120, 180, 220, 320, F, and FF. A 46 or 54 grade cloth is used on roughly filed work, while 220 to 320 grit cloth will give a good polish . By the successive use of progressively finer mesh emery paper, near-mirror finishes can be obtained. Water or oil

180-400: A smooth and shiny finish, notably in watchmaking. Emery paper , more commonly seen, has a paper backing and is usually a finer grit. Emery was considered a suitable abrasive for fitting work and the final adjustment of steel parts for a perfect fit. It had the advantage that, unlike harder abrasives, it was not considered to embed abrasive traces in the polished components afterwards. Emery

210-486: A use in modelling. For 00 scale modelling, the fine grades of emery paper can have the appearance of a tarmac surface. Crocus cloth is an abrasive sheet similar to sandpaper or emery cloth but covered with a layer of very fine loose iron oxide particles rather than with bound grains of abrasive. It is intended for final metal and gemstone finishing and is available in various grades (particle sizes). Federal Specification P-C-458 described this material in detail, although

240-410: Is ISO 6344 . Sandpaper and emery cloth are coated abrasives for hand use, usually non-precision. Other coated abrasive forms include sanding cords, pads, belts, and discs. Variants are available for use by hand or as components for power tools such as sanders , die grinders and belt sanders . Types of abrasive materials include: Sandpaper may be " stearated " where a dry lubricant is loaded to

270-633: Is commonly used with disc-type coated abrasives. A plastic or metal hub is bonded to one of the faces, which is threaded. This then mates directly to the sander or angle grinder or to a mandrel that can be mounted in a sander, grinder, or drill . The advantage is that the disc can be quickly replaced when needed. Quick-change discs are available in sizes of about 50 millimetres (2.0 in) and larger. Common substrates are paper , cloth, vulcanized fiber, and plastic films and come in grit sizes range from very coarse (~2 mm) to ultrafine (sub micrometre ). The international standard for coated abrasives

300-443: Is good for hand sanding or working with harder materials. In comparison, 50% to 70% of the surface is covered with abrasive grains with open coat sandpaper. The separation between particles makes the sandpaper more flexible, which prevents the sandpaper from clogging. However, the gaps in grit coverage limits the sandpaper's ability to perform even polishing jobs. Open coat sandpaper is better for softer materials. Wet and dry sandpaper

330-473: Is more effective used wet because clogging is reduced by particles washing away from the grinding surface. Sandpaper comes in a number of different shapes and sizes: Grit size refers to the size of the particles of abrading materials embedded in the sandpaper. These measurements are determined by the amount of the abrasive material that can fit through a square inch filter. Several standards have been established for grit size. These standards establish not only

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360-464: Is often substituted for emery, silicon carbide being slightly harder , and more durable with less tendency to fracture than corundum. The use of natural emery papers is rare today generally being replaced with silicon carbide or pure aluminium oxide papers. Emery cloth has the abrasives bonded to a fabric instead of a paper. The cloth is more tear resistant, flexible, and costly. Emery boards have applications similar to emery paper or cloth. It also has

390-493: Is often used as a lubricant and to float the abrasive debris and worn abrasive away from the work, preventing the build-up of debris in the emery paper. The paper will lose effectiveness if too much debris builds up, a condition known as "clogging", or "loading". Originally, emery paper was made from milled emery rock, bonded or sized to paper often with an animal glue for water resistance. Today, synthetic adhesives are used in place of natural glues and silicon carbide (SiC)

420-405: Is optimal for regular rounded or flat surfaces. 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. Stronger paper or backing increases the ease of sanding wood. The harder the backing material, the faster the sanding, the faster the wear of the paper and the rougher the sanded surface. A quick-change system

450-409: 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 ). The grit size of sandpaper is usually stated as a number that is inversely related to the particle size. A small number such as 20 or 40 indicates

480-624: The Japanese Industrial Standards Committee (JIS), the micron grade (generally used for very fine grits). Cheaper sandpapers may sometimes only use descriptive nomenclature such as "coarse", "medium" and "fine" without referring to any standard. Micrometre The micrometre ( Commonwealth English as used by the International Bureau of Weights and Measures ; SI symbol: μm ) or micrometer ( American English ), also commonly known by

510-584: The code point U+03BC μ GREEK SMALL LETTER MU . According to the Unicode Consortium , the Greek letter character is preferred, but implementations must recognize the micro sign as well for compatibility with legacy character sets . Most fonts use the same glyph for the two characters . Before desktop publishing became commonplace, it was customary to render the symbol μ in texts produced with mechanical typewriters by combining

540-512: The rough horsetail plant is used in Japan as a traditional polishing material, finer than sandpaper. Glass paper was manufactured in London in 1833 by John Oakey , whose company had developed new adhesive techniques and processes, enabling mass production. Glass frit has sharp-edged particles and cuts well whereas sand grains are smoothed down and do not work well as an abrasive. Cheap sandpaper

570-413: The abrasive to the paper. Hide glue is still used, but this glue often cannot withstand the heat generated during machine sanding and is not waterproof. Waterproof sandpapers or wet/dry sandpapers use a resin bond and a waterproof backing. Sandpaper can be either closed coat or open coat . Approximately 90% to 95% of the surface is covered with abrasive grains with a closed coat. Closed coat sandpaper

600-438: The abrasive. Stearated papers are useful in sanding coats of finish and paint as the stearate " soap " prevents clogging and increases the useful life of the sandpaper. The harder the grit material, the easier the sanding of harder surfaces like hardwoods such as hickory , pecan , or wenge . The grit material for polishing granite must be harder than granite. Emery cloth is a type of coated abrasive that has emery glued to

630-666: The average grit size, but also the allowable variation from the average. The two most common are the United States CAMI (Coated Abrasive Manufacturers Institute, now part of the Unified Abrasives Manufacturer's Association) and the European FEPA (Federation of European Producers of Abrasives) "P" grade. The FEPA system is the same as the ISO 6344 standard. Other systems used in sandpaper include

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660-421: The backing is usually designated by a letter. For paper backings, the weight ratings range from "A" to "F", with A designating the lightest and F the heaviest. 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. A flexible backing allows sandpaper to follow irregular contours of a workpiece; relatively inflexible backing

690-486: The non-SI term micron , is a unit of length in the International System of Units (SI) equalling 1 × 10   metre (SI standard prefix " micro- " = 10 ); that is, one millionth of a metre (or one thousandth of a millimetre , 0.001 mm , or about 0.000 04   inch ). The nearest smaller common SI unit is the nanometre , equivalent to one thousandth of a micrometre, one millionth of

720-453: The specification was cancelled in 1989. Abrasive papers and cloths with a waterproof backing allow the use of a lubricant, typically water, which can both decapitate rough surfaces when used dry and produce a semi-polished satin type finish when wet. Super-fine grades can produce a "key" adhesion surface appropriate for spray painting in critical decorative applications such as automotive bodywork repair. Different adhesives are used to bond

750-461: The symbol μ were officially accepted for use in isolation to denote the micrometre in 1879, but officially revoked by the International System of Units (SI) in 1967. This became necessary because the older usage was incompatible with the official adoption of the unit prefix micro- , denoted μ, during the creation of the SI in 1960. In the SI, the systematic name micrometre became the official name of

780-606: The systematic pronunciation of the unit name, in accordance with the convention for pronouncing SI units in English, places the stress on the first syllable ( / ˈ m aɪ k r oʊ m iː t ər / MY -kroh-meet-ər ). The plural of micron is normally microns , though micra was occasionally used before 1950. The official symbol for the SI prefix micro- is a Greek lowercase mu . Unicode has inherited U+00B5 µ MICRO SIGN from ISO/IEC 8859-1 , distinct from

810-478: The unit, and μm became the official unit symbol. In American English , the use of "micron" helps differentiate the unit from the micrometer , a measuring device, because the unit's name in mainstream American spelling is a homograph of the device's name. In spoken English, they may be distinguished by pronunciation, as the name of the measuring device is often stressed on the second syllable ( / m aɪ ˈ k r ɒ m ɪ t ər / my- KROM -it-ər ), whereas

840-445: Was also used for cleaning, as a means of removing rust from polished steel components. Both emery cloth and paper are still sold in hardware and do it yourself stores, but have been largely supplanted by the increased use of machine grinding to precision size, which has minimized or eliminated the need for hand-fitting; the widespread availability of powered hand tools employing sanding and grinding accessories such as flapwheels ; and

870-405: Was in automotive paint refinishing. In addition to paper, backing for sandpaper includes cloth ( cotton , polyester , rayon ), PET film , "fibre", and rubber. Cloth backing is used for sandpaper discs and belts, while PET film is used as backing for extremely fine grits. Fibre or vulcanized fibre is a strong backing material consisting of many layers of polymer impregnated paper. The weight of

900-411: Was often passed off as glass paper; Stalker and Parker cautioned against it in A Treatise of Japaning and Varnishing published in 1688. In 1921, 3M invented a sandpaper with silicon carbide grit and a waterproof adhesive and backing, known as Wet and dry . This allowed use with water, which would serve as a lubricant to carry away particles that would otherwise clog the grit. Its first application

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