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Material properties

The special feature of HAWAMID PA 12G is that it combines two important properties. Alternative materials such as POM or PA 6G may have individual material parameters that are superior in terms of e.g. strength, heat deflection temperature or abrasion resistance – but only if observed in isolation. As soon as they are subjected to environmental stress such as dampness, heat, cold, chemical substances etc., the material property values generally decrease rapidly.

HAWAMID PA 12G maintains its mechanical properties across a wide range of temperatures, absorbs the least amount of water amongst all polyamides and, to a great extent, is resistant to chemicals. What is decisive is the interaction between the required mechanical properties when subjected to the existing environmental conditions in the correct application.

This data printout contains guiding values. These values can be influenced by processing conditions, modifications, material additives and ambient influences and do not exempt the user from performing his own tests and trials. They have been compiled according to our current experience and knowledge. No legally binding guarantee of certain properties or suitability for concrete applications can be derived from our specifications.

It is the responsibility of the recipient of our products to observe possible property rights as well as existing laws and provisions.

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Test method Unit of measure Polyamides POM
Description HAWAMID HW HAWAMID HI HAWAMID + oil POM
Description ISO/DIN PA 12G PA 12G HI PA 12G +oil PA 6G POM C
General properties
Density DIN 53479 g/cm³ 1,03 1,03 1,025 1,15 – 1,17 1,41
Moisture absorption % 0,9 0,9 0,75/0,85 2 0,2
Moisture absorption when saturated % 1,1 1,1 1 6 – 7 0,8
Max. water absorption in standard atmospheric conditions 23/65 Gew.-% ca. 1,1 0,75/0,8
Mechanical characteristics
Tensile strength DIN 53455 N/mm² 66 62 64 85 72
Elongation at tear DIN 53455 % 10 12 11 60
250*
35
Elastic modulus tensile test DIN 53457 N/mm² 2200 2100 2100 3000
1900*
2750 – 3000
Tensile stress after 1000 h at 1% elongation DIN 53444 N/mm² 40 36 36 21 14
Bending strength dry DIN 53452 N/mm² 90 85 100 94
Elastic modulus bending test DIN 53452 N/mm² 2400 2200 3300 2500
Permissible pressure load at 0.1% compression DIN 53505 N/mm² 46 42 32 35
Hardness Shore D 78 72 76 80 85
Ball indentation hardness DIN 53456 N/mm² 106 100 95 140 150
Antifriction properties (compared to steel) µ 0,35 0,38 0,18 0,21 – 0,4 0,15 – 0,35
Friction wear (compared to steel) µm/km 0,2 0,2 0,1 0,10 8,9
PV guiding value at v = 0.1 m/s
p ~ 24 N/mm² dry
N/mm² * m/s 0,15 – 0,12 0,15 – 0,12 0,25 – 0,30 0,13 0,15
Friction coefficient static 0,35 0,35 0,35 o. A. o. A.
Friction coefficient dynamic 0,40 0,40 0,40 o. A. o. A.
Elongation at yield point DIN 53455 % 7 9 9 15 – 30
Elongation at break % 9 11 10 >30
Impact strength (Chapy) 20°C KJ/m² 8 – 12 12 – 15 10 – 12 5 – 6 7
Impact strength (Chapy) -50°C KJ/m² 6 – 10 8 – 12 8 – 10 4 – 5 5
Abrasion resistance Taber- Abrazer mg/100 U 24 24
Impact strength 23°C mJ/mm² 110 140 130 >150
Impact strength -30°C mJ/mm² 65 80 80
Vicat-B-50 softening temperature °C 188 ±3 177 ±3 185 ±3 210 140
Thermal properties
Temperature limit in the application Constant (bottom and top temp.) °C -50 bis 120 -40 bis 100 -50 bis 80
Temporary °C 150 120 100
Constant temperature (<104 h) in oil °C 140
Constant temperature (<104 h) in water °C 90
Constant temperature (<104 h) in air °C 120
Therm. coefficient of linear expansion DIN 52328 K-1*10-5 8 – 10 9 8 – 10 9 12
Coefficient of linear expansion
-50°C – (-30°C)
VDE 0304 10-4 °C 0,8 – 1,0
Coefficient of linear expansion
+30°C – (+80°C)
VDE 0304 10-4 °C 1,0 – 1,8
Coefficient of thermal conductivity DIN 52612 W/m*K 0,23
UL flammability rating UL94 HB
Application temperature max. temporary °C bis 150
Vicat-B-50 softening temperature DIN 53460 °C 182 – 190
Heat distort resistance air humidity ISO/R75/B °C 185 – 190
Specific heat kJ/kg K 2,4
Brittling in cold °C ≤-50 ≤ -50
Electrical properties
test sample 24 h in standard atmospheric conditions 23/50 conditioned
Spec. volume resistivity at 23 °C DIN 53482 Ω cm 2,7 * 1014 1012 /1010* 1014
Spec. volume resistivity at 70 ℃ Ω cm 1,0 * 1014
Surface resistance DIN 53482
Verf. ROA
1013 1012 1013
Percussion strength DIN 53481 kV/mm 30 20 >16
Relative permittivity (103 Hz) at 23°C DIN 53483 3,5 (bei 50 Hz) 3,7 3,7
Dissipation factor (103 – 106 Hz) DIN 53483 0,038 (bei 50 Hz) 0,03 0,005
Track resistance KB DIN 53480 KB 550
Track resistance KC DIN 53480 KC 600 > 600
Area of application
Acid resistance C C B
Alkali resistance A A B
Hot water resistance (hydrolysis) B – C B – C B
UV radiation (outside use)) B B/ sw A C/ sw A


A = no corrosion
B = slight corrosion
C = moderate corrosion, low absorption
D = disintegrated in short time

HW: Highly wear-resistant
HI: Highly impact-resistant

* damp 23°C/ 50% humidity

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