Material properties
The combination of special properties of HAWAMID PA 12G
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.
Test method | Unit of measure | Polyamides | Polyamides | Polyamides | Polyamides | POM | |
---|---|---|---|---|---|---|---|
Description | HAWAMID HW | HAWAMID HI | HAWAMID + Öl | POM | |||
Description ISO/DIN | PA 12G | PA 12G HI | PA 12G +Öl | 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 | |
Feuchtigkeitsaufnahme bei Sättigung | % | 1,1 | 1,1 | 1 | 6 – 7 | 0,8 | |
Max. water absorption in standard atmospheric conditions 23°C | 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 | 0,4 | 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 | Ω | 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