Sandpaper

"Sanding" redirects here. For the fish known as sanding, seePseudaphritis urvillii.

Sandpaper,also known asglasspaperor ascoated abrasive,is a type of material that consists of sheets ofpaperorclothwith anabrasivesubstance glued to one face.In the modern manufacture of these products, sand and glass have been replaced by other abrasives such as aluminium oxide or silicon carbide. It is common to use the name of the abrasive when describing the paper, e.g. "aluminium oxide paper", or "silicon carbide paper".

Sheets of sandpaper with different grit sizes (40 (coarse), 80, 150, 240, 600 (fine))

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 is used to remove material from surfaces, whether to make them smoother (for example, inpaintingandwood finishing), to remove a layer of material (such as oldpaint), or sometimes to make the surface rougher (for example, as a preparation forgluing). 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 a coarse grit, while a large number such as 1500 indicates a fine grit.

History

The first recorded instance of sandpaper was in 13th-centuryChinawhen crushed shells, seeds, andsandwere bonded to parchment usingnatural gum.

Sharkskin (placoid scales) has also been used as an abrasive, and the rough scales of theCoelacanthare used for the same purpose by the natives ofComoros.Boiled and dried, therough horsetailplant is used in Japan as a traditional polishing material, finer than sandpaper.

Glass paper was manufactured inLondonin 1833 byJohn Oakey,whose company had developed new adhesive techniques and processes, enabling mass production. Glassfrithas sharp-edged particles and cuts well whereas sand grains are smoothed down and do not work well as an abrasive. Cheap sandpaper was often passed off as glass paper; Stalker and Parker cautioned against it inA Treatise of Japaning and Varnishingpublished in 1688.

In 1921,3Minvented a sandpaper withsilicon carbidegrit and a waterproof adhesive and backing, known asWet 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 was in automotive paint refinishing.

Backing

320 grit silicon carbide sandpaper, with close-up view

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 orvulcanizedfibre is a strong backing material consisting of many layers of polymer impregnated paper. The weight of 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 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.

Fitting

Examples of sanding discs using a quick-change mounting system

A quick-change system 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 thesanderorangle grinderor to a mandrel that can be mounted in a sander, grinder, ordrill.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.

Abrasives

Emery cloth sheet whose componentabrasiveis aluminium oxide

Assorted coated abrasives

Common substrates arepaper,cloth, vulcanized fiber, andplasticfilms and come in grit sizes range from very coarse (~2 mm) toultrafine(submicrometre). Theinternational standardfor coated abrasives isISO 6344.Sandpaper andemery clothare 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 forpower toolssuch assanders,die grindersandbelt sanders.

Types of abrasive materials include:

• Glass:No longer commonly used.
• Flint:No longer commonly used.
• Garnet:Commonly used inwoodworking.
• Emery:Commonly used to abrade or polish metals.
• Aluminium oxide:The most common in modern use, with the widest variety of grits, lowest unit cost; can be used on metal (i.e. body shops) or wood.
• Silicon carbide:Available in very coarse grits all the way through to microgrits, common in wet applications.
• Alumina-zirconia: (An aluminium oxide–zirconium oxidealloy), used for machine grinding applications.
• Chromium(III) oxide:Used in extremely fine micron grit (micrometrelevel) papers.
• Diamond:Used for finishing and polishing hard metals, ceramics and glass.
• Ceramic aluminium oxide:Used in high pressure applications, used in both coated abrasives, as well as in bonded abrasives.

Sandpaper may be "stearated"where a dry lubricant is loaded to 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 ashickory,pecan,orwenge.The grit material for polishinggranitemust be harder than granite.

Emery

320 grit emery cloth

Emery cloth is a type of coated abrasive that hasemeryglued to aclothbacking. 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 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 forfittingwork 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 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 anddo it yourselfstores, 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 asflapwheels;and a shift to other forms of abrasive, such asaluminium oxide,aluminium zirconiaandsilicon 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 goodpolish.

By the successive use of progressively finer mesh emery paper, near-mirror finishes can be obtained. Water or oil 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 orsizedto paper often with ananimal gluefor water resistance.Today,synthetic adhesivesare used in place of natural glues andsilicon carbide(SiC) is often substituted for emery, silicon carbide being slightlyharder,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 boardshave applications similar to emery paper or cloth. It also has a use in modelling. For00 scalemodelling, the fine grades of emery paper can have the appearance of atarmacsurface.

Crocus

Crocus cloth is an abrasive sheet similar to sandpaper or emery cloth but covered with a layer of very fine looseiron oxideparticles 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 the specification was cancelled in 1989.

Wet and dry papers

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.

Bonds

Different adhesives are used to bond the abrasive to the paper.Hide glueis 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 eitherclosed coatoropen coat.Approximately 90% to 95% of the surface is covered with abrasive grains with a closed coat. Closed coat sandpaper 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 is more effective used wet because clogging is reduced by particles washing away from the grinding surface.

Shapes

Sandpaper comes in a number of different shapes and sizes:

• Sheet: usually 9 by 11 inches (23 by 28 cm), but other sizes may be available
• Belt: usually cloth backed, comes in different sizes to fit differentbelt sanders.
• Disk: made to fit different models of disc and random orbit sanders. May be perforated for some models of sanders. Attachment includes pressure-sensitive adhesive (PSA) and "hook-and-loop"(similar to Velcro).
• Rolls: known as "shag rolls" by many contractors
• Sponge: for tight places

Grit sizes

Grit 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 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 theISO 6344standard. Other systems used in sandpaper include theJapanese 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.

See also

• Grain size
• Lapping film
• Rotary tool
• Sanding block
• Steel abrasive

Further reading

• Dresdner, Michael (1992).The Woodfinishing Book.Taunton Press.ISBN1-56158-037-6
• Flexner, Bob (2005).Understanding Wood Finishing — How to Select and Apply the Right Finish.Fox Chapel Publishing. ISBN Hardcover:978-1-56523-548-9. ISBN Paperback:978-1-56523-566-3

External links

• Federation of European Producers of Abrasives
• sizes on sandpaper
• Conversion Chart Abrasives - Grit Sizes