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Polyoxymethylene
Names
Other names
Poly(oxymethylene) glycol; polymethylene glycol
Identifiers
CAS Number
9002-81-7Y
ChemSpider
None
UNII
QHG55SH7ERY
CompTox Dashboard (EPA)
DTXSID001010896
Properties
Chemical formula
(CH2O)n
Molar mass
Variable
Appearance
White solid (undyed)
Density
1.41–1.42g/cm3[1]
Melting point
165 °C (329 °F)[2]
Electrical resistivity
14×1015 Ω⋅cm[2]
Magnetic susceptibility (χ)
−9.36×10−6 (SI, at 22°C) [3]
Thermochemistry
Heat capacity (C)
1500 J/kg·K[2]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Nverify (what is YN ?)
Infobox references
Chemical compound
Keck clips made of polyoxymethylene
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. As with many other synthetic polymers, it is produced by different chemical firms with slightly different formulas and sold variously by such names as Delrin, Kocetal, Ultraform, Celcon, Ramtal, Duracon, Kepital, Polypenco, Tenac and Hostaform.
POM is characterized by its high strength, hardness and rigidity to −40 °C. POM is intrinsically opaque white because of its high crystalline composition but can be produced in a variety of colors.[1] POM has a density of 1.410–1.420g/cm3.[5]
Typical applications for injection-molded POM include high-performance engineering components such as small gear wheels, eyeglass frames, ball bearings, ski bindings, fasteners, gun parts, knife handles, and lock systems. The material is widely used in the automotive and consumer electronics industry. POM's electrical resistivity is 14×1015 Ω⋅cm making it a dielectric with a 19.5MV/m breakdown voltage.[2][6]
^Wapler, M. C.; Leupold, J.; Dragonu, I.; von Elverfeldt, D.; Zaitsev, M.; Wallrabe, U. (2014). "Magnetic properties of materials for MR engineering, micro-MR and beyond". JMR. 242: 233–242. arXiv:1403.4760. Bibcode:2014JMagR.242..233W. doi:10.1016/j.jmr.2014.02.005. PMID 24705364. S2CID 11545416.
^"MatWeb:acetal".
^"Ticona MSDS for Hostaform". Archived from the original on 2011-05-12.
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