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  2. Sandpaper - Wikipedia

    en.wikipedia.org/wiki/Sandpaper

    Sandpaper, also known as glasspaper or as coated abrasive, is a type of material that consists of sheets of paper or cloth with an abrasive substance glued to one face. [1] In the modern manufacture of these products, sand and glass have been replaced by other abrasives such as aluminium oxide or silicon carbide.

  3. Soil gradation - Wikipedia

    en.wikipedia.org/wiki/Soil_Gradation

    A poorly-graded soil is a soil that does not have a good representation of all sizes of particles from the no. 4 to no. 200 sieve. A poorly-graded gravel is classified as GP, while a poorly-graded sand is classified as SP. Poorly-graded soils are more susceptible to soil liquefaction than well-graded soils. [1]

  4. ISO 6344 - Wikipedia

    en.wikipedia.org/wiki/ISO_6344

    ISO 6344 is an international standard covering the materials sizes and tests regarding sandpaper and other similar coated abrasives. It has three parts: ISO 6344-1:1998: Grain size distribution test; ISO 6344-2:1998: Determination of grain size distribution of macrogrits P12 to P220

  5. Sand - Wikipedia

    en.wikipedia.org/wiki/Sand

    Sand is a granular material composed of finely divided mineral particles. Sand has various compositions but is defined by its grain size. Sand grains are smaller than gravel and coarser than silt. Sand can also refer to a textural class of soil or soil type; i.e., a soil containing more than 85 percent sand-sized particles by mass. [2]

  6. Grain size - Wikipedia

    en.wikipedia.org/wiki/Grain_size

    Coarse sand 2 to 1 0.25–0.5 mm 0.010–0.020 in Medium sand 3 to 2 125–250 μm: ... "A Scale of Grade and Class Terms for Clastic Sediments".

  7. Unified Soil Classification System - Wikipedia

    en.wikipedia.org/wiki/Unified_Soil...

    sand ≥ 50% of coarse fraction passes No.4 (4.75 mm) sieve clean sand SW well-graded sand, fine to coarse sand SP poorly graded sand sand with >12% fines SM silty sand SC clayey sand Fine grained soils 50% or more passing the No.200 (0.075 mm) sieve silt and clay liquid limit < 50 inorganic: ML silt CL lean clay organic: OL organic silt ...

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