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POM(Polyacetal) sheet
Properties
POM is characterized by its high strength, hardness and rigidity to -40 °C. POM is intrinsically opaque white, due to its high crystalline composition, but it is available in all colors. POM has a density of ρ = 1.410-1.420 g/cm3.[5]
POM homopolymer is a semi-crystalline polymer (75-85% crystalline) with a melting point of 175° Celsius. The POM copolymer has a slightly lower melting point of 162 – 173° Celsius.
POM is a tough material with a very low coefficient of friction. However, it is susceptible to polymer degradation catalyzed by acids, which is why both polymer types are stabilized. Both homopolymer and copolymer have chain end groups (introduced via end capping) which resist depolymerization. With the copolymer, the second unit normally is a C2 (ethylene glycol) or C4 (1,4-butanediol) unit, which is introduced via its cyclic acetal (which can be made from the diol and formaldehyde) or cyclic ether (e.g. ethylene oxide). These units resist chain cleavage, because the O-linkage is now no longer an acetal group, but an ether linkage, which is stable to hydrolysis. POM is sensitive to oxidation, and an anti-oxidant is normally added to molding grades of the material.
POM advantages:
High abrasion resistance
Low coefficient of friction
High heat resistance
Good electrical and dielectric properties
Low water absorption
Usage:
Mechanical gears, sliding and guiding elements, housing parts, springs, chains, screws, nuts, fan wheels, pump parts, valve bodies.
Electrical Engineering: insulators, bobbins, connectors, parts for electronic devices such as televisions, telephones, etc.
Vehicle: Fuel sender unit, Light stock (including shifter for light, turn signal), power windows, door lock systems, articulated shells.
Model: Thin, later claimed Modellbahnen parts, such as bogies and handle bars. POM breaks under load slightly less than ABS, but in bright translucent colors, and not paintable.
Medical: insulin pen, Metered dose inhalers (MDI)
Furniture: hardware, locks, handles, hinges, or even curtains roles.
Construction: Structural Glass - pod holder for point
Packaging: aerosol cans, vehicle tanks.
Sports: Paintball accessories. It is often used for machined parts of paintball markers that do not require the strength of aluminum, such as handles and reciprocating bolts. POM is also used in airsoft guns, in order to reduce the noise of the piston.
Clothing: zippers.
Music: picks, Irish flutes, Bagpipes, Practice chanters, harpsichord plectra, tuba mouthpieces .
Dining: Fully automatic coffee brewers; knife handles (particularly folding knives)
The Food and Drug Administration has approved Delrin for use in the food industry.
Performance table:
Density | 1.405g/cm³ |
| Tensile strength | 70MPa |
| Impact strength(nick) | 8KJ/m² |
| Bend strength | 130~150MPa |
| Compression strength | 126MPa |
| Elongation | 6.0% |
| Shear strength | 80~95MPa |
| Hardness(HB) | 270~280N/mm² |
| The highest continuous temperature | 110°C |
| Break down resistance | 18.6KV/mm |
| Elastic modulus in tension | 26.4~31Gpa |
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