PA
POLYAMIDES

Description:

Nylon - polyamides possess good mechanical strength coupled with great tenacity and high impact resistance.
Resistance to wear high, suitable for many technical jobs; suited to the realization of complicated technical artefacts.
The main polyamides are used PA 6, PA 66 and PA 12.
The polyamides can be obtained from a material basis (basic element), and in this case are designated with a number which corresponds to the number of carbon atoms in the base (PA 6, PA 11, PA 12);
Or can be derived from two basic materials (basic) they go to form a group structure, are designated with a number according to the number of carbon atoms in the two basic elements (PA 6.6, 6.10 PA, PA 6.12)

Watt Density ':

PA 6:
  From 1.12 to 1.14 g/cm3
 
PA 66:
  From 1.13 to 1.14 g/cm3
 
PA 12:
  From 1.01 to 1.02 g/cm3
 


Structure:

Partially crystalline thermoplastic material (crystallinity up to 60%)
Heavy water absorption (PA 6 and PA 66)

Mechanical characteristics:

They are variable and depend on the PA, the percentage of water absorbed and the crystallinity.
High fatigue strength, good resistance to wear and, after absorbing water very tough.

Electrical characteristics:

Depends on the percentage of water consumption
Good surface resistance and thus good resistance to current strips
You have dielectric loss at high frequencies, but the excellent 'use at low frequencies

Thermal characteristics:

The temperature higher usage varies, depending on the type, from 80 to 120 ° C (for short time from 140 to 210 ° C).
resistant up to -40 ° C
Burn with flame light blue dripping .
In part self, can improve with the addition of additives flame resistant.
The thermal resistance can be improved by adding heat stabilizers.

Resistant to:

Aliphatic and aromatic hydrocarbons, gasoline, oils, greases, some alcohols, esters, ketones, ethers, many chlorinated hydrocarbons, weak alkaline solutions.
Enough resistance to ageing.
Good resistance to the weather.

Not resistant to:

Mineral acids, strong alkaline solutions, solutions oxidizing agents, formic acid, phenol, cresols, glycols, chloroform.

Water absorption:

In the normal climate polyamides absorb moisture slowly to stabilize the following table:

Weight gain in conditioning%

 
Normal climate Immersion in water
23/50 20 ° C

 
Crystallinity High Low High Low