Meaning
Semicrystalline engineering resins offer high mechanical strength through the repetition of amide groups. Manufacturers use polyamide 6 for automotive and industrial parts that require toughness and heat resistance. The material is produced through the ring opening polymerisation of caprolactam.
It is known for its smooth surface finish and ease of processing in injection moulding.
Moisture Absorption
The amide groups in the chain attract water molecules from the environment.
Mechanical Performance
The polymer exhibits high resistance to breaking under tension when dry. In the case of polyamide 6, the orientation of the molecules during the moulding process further enhances this property. Glass fiber reinforcement is often added to increase the stiffness of the material.
This combination makes it suitable for structural components like engine covers and tool housings that must withstand heavy loads.
Proper Condition
Hot air or desiccant drying of the resin is mandatory before processing. If polyamide 6 is processed while wet, the water causes hydrolytic degradation which weakens the final part. Moulders use specialised equipment to reach a moisture content below zero point two percent.
Controlling the mould temperature is also necessary to achieve the correct level of crystallinity and dimensional stability in the finished item.