China factory direct ISO standard POM chain
POM (Full-name: Polyformaldehyde), is a engineering plastics of non-side-chain, high density, high crystalline and linear polymer, which is praised "Plastic Steel", and has comprehensive excellent performances, such as: wear-resistance, high hardness, anti-impregnant, good rigidity (Tensile modulus of elasticity), chemical stability, isolation resistance and dimensional stability.
POM has widely applied in Automobile industries, electronic and electric products, commodity, pipeline & fittings, exact apparatus and so on, which can be instead of the bronze, Zinc, tin and other metals.
Except POM-H, is often copolymerized with ethylene oxide together, in order to avoid the melting of POM material in the high temperature. POM-H has the better performances than POM-C in its high crystalline, mechanical strength and rigidity.
And POM-C has the better performances than POM-H in its low melting point, temperature stability, fluxion characteristic and machining capability.
Father more, POM-H+PTFE, which is made from the Delrin POM Resin that maxed Teflon fiber symmetrically, has the low co-efficient of frication, good lubrication, wear-resistance, non-creepage resistance.
Material parameter table:
| Property |
Item No. |
Unit |
POM-C |
POM-H |
POM-H+PTFE |
| Mechanical Properties |
1 |
Density |
g/cm3 |
1.41 |
1.43 |
1.50 |
| 2 |
Water absorption(23ºC in air) |
% |
0.20 |
0.20 |
0.17 |
| 3 |
Tensile strength |
MPa |
68 |
78 |
55 |
| 4 |
Tensile strain at break |
% |
35 |
35 |
10 |
| 5 |
Compressive stress(at 2%nominal strain) |
MPa |
35 |
40 |
37 |
| 6 |
Charpy impact strength (unnotched) |
KJ/m2 |
≥150 |
≥200 |
≥30 |
| 7 |
Charpy impact strength (notched) |
KJ/m2 |
7 |
10 |
3 |
| 8 |
Tensile modulus of elasticity |
MPa |
3100 |
3600 |
3200 |
| 9 |
Ball indentation hardness |
N/mm2 |
140 |
160 |
140 |
| |
10 |
Rockwell hardness |
- |
M84 |
M88 |
M84 |
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