POM (Polyformaldehyde resin) Definition: Polyformaldehyde is a linear polymer with no side chain, high density and high crystallinity. According to the chemical structure of its molecular chain, it can be divided into two kinds of homopolyformaldehyde and copolyformaldehyde. The important difference between the two is: homopolyformaldehyde density, crystallinity, melting point are high, but the thermal stability is poor, the processing temperature range is narrow (about 10℃), the acid and base stability is slightly low; And copolyformaldehyde density, crystallinity, melting point, strength are low, but good thermal stability, not easy to decompose, processing temperature range is wide (about 50 ° C), acid and base stability is better. It is an engineering plastic with the best comprehensive performance. It has good physical, mechanical and chemical properties, especially the best performance. Commonly known as Sai steel or seize steel, for general engineering plastics. Suitable for the production of anti-friction parts, transmission parts, as well as chemical, instrument and other parts. One kind of synthetic resin, also known as polyformaldehyde resin, POM plastic, steel material, etc.; Is a kind of white or black plastic particles, with high hardness, high steel, high strength characteristics. It is mainly used in gear, bearings, auto parts, machine tools, instrument internals and other products that play the role of skeleton.
Performance item Test conditions test side test item
[Status] Polyformaldehyde
method
Data
Data units
Physical properties
g/cm
density
AST MD7 1.41
&sup
92
3;
23° Water absorption C, 60%RH
ASTM
D570
0.22%
Melt index
ASTM
9 D1238
g/10min
10&de
Thermal performance melting point
g;C/mi DSC 165
n
°
C
Thermal stabilization
0.46MPa temperature
ASTM D648
158 °C
1.86M ASTMD Pa
648
110
&de
g;C
Linear heat 20° Expansion system C-80&de E831 number
g;C
13
*10 -5&de g;C
Flammability Flammability
t0.8m PC Or ABS
m
UL94 HB Polypropylene
Mechanical property
Tensile strength
23&de g;C
AST MD6 62
38
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Elongation
23° ASTM
c
D638
60
%
Bend strong 23° ASTM degree
C
D790
91.5 MPa
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