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Polyamides are subdivided into various basic types. The most important for technical applications are PA 6, PA 66, PA 6 G and PA 12 and these have established themselves as the most important representatives of the polyamide materials. Polyamides manufactured in monomer casting show a higher degree of crystallinity and thus have much better material properties than the extruded types. But apart from the type specific properties, all polyamides share, independently of their manufacturing process, a great number of basic properties specific to the material.
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Extruded Polyamides |
| Polyamide 6 Polyamide 6 (PA 6) is the best known extruded polyamide and offers a combination of all typical polyamide material properties. Compared to the cast varieties however, this variety displays higher water absorption, is less wear resistant and has less dimensional stability. Furthermore, because of the manufacturing process, only a limited size range and unit weight can be produced. This restricts the design possibilities of the user. Polyamide 6+MoS2+Carbon BLK In comparison to unfilled PA 6 improved sliding properties at slightly higher compressive strength. UV-radiation resistance is enhanced by its black color. It has also improved wear resistance and lower surface friction than unfilled PA 6, moisture absorption is also bit lower. Polyamide 6+30% GF Compared to unreinforced PA 6, the combination with glass fibre produces an improved pressure and tension resistance, rigidity and dimensional stability as well as low water absorption. Glass fibre reinforced Polyamide 6 is therefore particularly suitable for components which are subjected to medium stress and/ or medium demands on the dimensional stability in comparison to PA 6. Polyamide 66 PA 66 is used in smaller dimensioned applications and offers higher rigidity and wear resistance compared to PA 6. PA 66 shows comparable continuous high working temperature range. Compared to the cast varieties, this material also has higher water absorption. Regarding the other properties, PA 66 is comparable to the standard cast type PA 6 G, however it is much more costly. As in the case of PA 6, the manufacturing process limits the size and unit weight which can be produced, and this restricts the design possibilities of the user. Therefore PA 66 in practical application is replaced to a large extent by the more economical PA 6 G, which can also be produced in almost unlimited sizes. Polyamide 66+30% GF Compared to unreinforced PA 66, the combination with glass fibre produces an improved pressure and tension resistance, rigidity and dimensional stability as well as low water absorption. Glass fibre reinforced Polyamide 66 is therefore particularly suitable for components which are subjected to high stress and/ or high demands on the dimensional stability. Polyamide 12 PA 12 has very good impact resistance, it is tough and, because of its very low water absorption, it remains dimensionally stable. As a semi-finished product it has only a limited availability, but because of its high price (3 – 4 times more expensive than PA 6) it is usually not considered in design options. Polyamide 12+MoS2+Carbon BLK PA 12 with MoS2 & carbon black has exceptionally high impact strength at low temperatures as well. Applications are for high end use for maintenance-free parts or parts subject to impact or environments in which noise and vibration damping properties are required. Preferred for sealing and damping elements; valves, pumps and fuel line applications. Polyamide 12+30% GF PA 12 has minimal moisture absorption and maximum dimensional stability amongst all grades of polyamides. PA 12 with glass fibre has good application as housings and covers, due to its repeated high stress, impact or environments in which noise and vibration damping properties. Polyamide 46 PA 46 has excellent sliding properties & high abrasion resistance; it keeps high stiffness and tensile strength also at high service temperatures and outstanding notched-bar impact strength. In thin-walled parts, PA 46 displays reduced mechanical strength and dimensional stability; otherwise the main field of application is for parts exposed to high mechanical loads and temperatures. The material shows good machinability, adhesive properties & weldability. |
Mr. Girish Dhawan
(Proprietor)
No. 170, Gali Bandook Wali, Ajmeri Gate
New Delhi,
Delhi -
110 006,
India
Telephone:+(91)-(11)-23215389/ 32972567
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