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A '''density cup''' is an instrument that is used to ensure [[Quality control|quality control]] in a [[Engineering:Paint|paint]] or [[Engineering:Lacquer|lacquer]].<ref>{{cite web|url=http://www.astm.org/Standards/D1475.htm|title=ASTM D1475 - 13 Standard Test Method For Density of Liquid Coatings, Inks, and Related Products|website=www.astm.org}}</ref>  It does this by measuring the [[Physics:Density|density]] of the paint or lacquer, and comparing this density with the density of a standard for that paint or lacquer.<ref name="byk.com">{{cite web|url=https://www.byk.com/en/instruments/products/liquid-paint/density-cups.html|title=Density is the weight per unit volume at a specified temperature.|website=www.byk.com}}</ref>  If the density reading is different from the standard, then there is an error in paint composition because if there were no error in paint composition, then the measurement would match up to the standard density for that paint or lacquer.<ref>{{cite web|url=http://www.astm.org/Standards/D2805.htm|title=ASTM D2805 - 11 Standard Test Method for Hiding Power of Paints by Reflectometry|website=www.astm.org}}</ref>
Knowing the density of a paint is essential because a consistent density assures overall consistency between products of the same color.

Density cups are precisely measured cylinders that are made of [[Chemistry:Stainless steel|stainless steel]], and usually have a hole in the top through which excess liquid and air bubbles can escape.<ref name="byk.com"/>   

==References==
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[[Category:Quality control tools]]

{{Sourceattribution|Density cup}}