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Polyoxymethylene (POM), also known as acetal, [4] polyacetal, and polyformaldehyde, is an engineering thermoplastic used in precision parts requiring high stiffness, low friction, and excellent dimensional stability.
An Italian jewelry casket, 1857, carved walnut, lined with red velvet. A casket [1] is a decorative box or container that is usually smaller than a chest and is typically decorated. In recent centuries they are often used as boxes for jewelry, but in earlier periods they were also used for keeping important documents and many other purposes. [2]
Polyoxymethylene (POM), also known as acetal, polyacetal and polyformaldehyde, is an engineering thermoplastic used in precision parts requiring high stiffness, low friction, and excellent dimensional stability. As with many other synthetic polymers, it is produced by different chemical firms with slightly different formulas and sold variously ...
Coffin-shaped snuff box made from sheet copper, raised, tinned inside and engraved. 1792, Victoria and Albert Museum People of all social classes used these boxes when snuff was at its peak of popularity and the wealthy carried a variety of fancy snuff-boxes created by craftsmen in metal-work, jewellers and enamellers .
The chain thread is the carrier in which the coloured striking thread is woven. In this way, a colourful pattern or image is created. Most weavers use a naturally based chain thread made out of linen or wool. The striking threads can be made out of silk, wool, gold or silver, but can also be made out of any form of textile. tarlatan
Left: individual linear polymer chains Right: Polymer chains which have been cross linked to give a rigid 3D thermoset polymer. In materials science, a thermosetting polymer, often called a thermoset, is a polymer that is obtained by irreversibly hardening ("curing") a soft solid or viscous liquid prepolymer (). [1]
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Polyolefin sheets or foams are used in a wide variety of packaging applications, sometimes in direct contact with food. [ 14 ] Polyolefin elastomer POE is used as a main ingredient in the molded flexible foam technology such as in the fabrication of self skinned footwear (for example, Crocs shoes), seat cushions, arm rests, spa pillows, etc ...