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Poliacetal
- POM A.H. |
Chemical Designation:
Polyoxymethylene (Copolymer)
DIN Abbreviation: POM
Colour, Filler: opaque
Stock Availability: Standard
lengths 3 metres, also cut to size
Rod 3 - 250 mm dia
Plate 1 - 100 mm thick
Tube 20 - 300 mm OD
Profile
Finished parts, machined or
injection moulded
Poliacetal - POM A.H. is a
semicrystalline thermoplastic engineering material with high strength
and rigidity, excellent machinability and versatility of application.
Main characteristics: strong
and rigid very good electrical
tough insulation
good sliding properties, easily
machined, polished
resistant to hot water,
difficult to bond
dilute acids, cleaning, easily
welded
agents, numerous solvents
Preferred Fields: Mechanical
engineering, automotive engineering, transport and conveyor
technology, electrical engineering, precision engineering, household
appliances, food technology, medical technology
Applications: friction bearings,
friction strips
gears, plugs
tool supports, insulators
housing parts, agitators and
kneeding elements
rollers, seals
Poliacetal -
POM A.H.
The following information
corresponds with our current knowledge and indicates our products and
possible applications. We cannot give a legally binding guarantee of
certain properties or the suitability for a specific application.
Existing commercial patents must be observed. A definitive quality
guarantee is given in our general conditions of sales. Unless otherwise
stated, these values represent averages taken from injection moulding
samples. We reserve the right of technical alterations.
| Properties |
Unit |
Test
method DIN ASTM |
|
| Mechanical |
|
|
|
| Density |
g/cm³ |
53
479 |
1.41 |
| Tensile
strength at yield |
MPa |
53
455 |
65 |
| Tensile
strength at break |
MPa |
53
455 |
|
| Elongation
at break |
% |
53
455 |
40 |
| Modulus
of elasticity in tension |
MPa |
53
457 |
3100 |
| Modulus
of elasticity in flexure |
MPa |
53
457 |
|
| Ball
indentation hardness |
MPa |
53
456 |
155 |
Impact
strength
(Charpy) |
kJ/m2 |
53
453 |
no
br. |
| Creep
rupture strength after 1000 hrs with static load |
MPa |
|
40 |
| Time
yield limit for 1% elongation after 1000 hrs. |
MPa |
|
13 |
Coefficient
of friction against hardened and ground steel
p = 0,05 N/mm², v = 0,6 m/s |
– |
|
0.32 |
| Wear
conditions as above |
µm/km |
|
8.9 |
| Thermal |
|
|
|
| Crystalline
melting point |
°C |
53
736 |
165 |
| Glass
transition temperature |
°C |
53
736 |
-
60 |
| Heat
distortion temperature Method A Method B |
°C
°C |
ISO 75
ISO 75 |
110
160 |
| Properties |
Unit |
Test
method DIN ASTM |
|
| Thermal |
|
|
|
Max.
service temperature
short term long term |
°C
°C |
|
140
100 |
| Coefficient
of thermal conductivity |
W/(m . K) |
|
0.31 |
| Specific
heat |
J/(g . K) |
|
1.5 |
| Coefficient
of thermal expansion |
10-5/K |
|
10 |
| Electrical |
|
|
|
| Dielectric
constant at 105 Hz |
|
53
483 |
3,5 |
| Dielectric
loss factor at 105 Hz |
|
53
483 |
0.003 |
| Specific
volume resistance |
W . cm |
53
482 |
1015 |
| Surface
resistance |
W |
53
482 |
1013 |
| Dielectric
strength 1 mm |
kV/mm |
53
481 |
>50 |
| Tracking
resistance |
|
53
480 |
KA
3c |
| Miscellaneous |
|
|
|
Moisture
absorption:
Equilibrium in standard atmosphere (23 °C / 50 % relative
humidity) |
% |
53
714 |
0.3 |
Water
absorption at saturation
at 23 °C |
% |
53
495 |
0.5 |
| Resistance
to hot water, washing soda |
|
|
limited
resistant |
| Flammability |
|
UL
94 |
HB |
| Resistance
to weathering |
|
|
not
resistant |
* after storage in a standard
23/50 atmosphere (DIN 50 014) to equilibrium
Europlásticos coloca a
disposição, também :
- Semi-finished product,
finished parts, injection moulded parts and profiles in more than
500 materials and modifications.
- Engineering plastics: PA
extruded or cast, POM, PC, PET, PBT, PPE, PP, PE
- High temperature plastics: PI,
PEEK, PPS, PES, PPSU, PEI, PSU, PVDF, PCTFE, PTFE
- Stock length: Standard 3
metres
- Pressed/sintered semi-finished
product: PI, PEEK, PPS, PTFE/PI and modifications, as well as PCTFE
in special sizes ie, large discs, tube and rings with diameters up
to about 820 mm
- Material modifications: eg
glass, carbon and aramid fibre, talc, MoS2, graphite,
PTFE, PE, silicone oil, internal lubrication
- Pultruded stock shapes: matrix
polyester, vinylester and epoxy resin with glass or carbon
continuous fibre.
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