Aramid Fibres
There are two different molecular structures of aramids (aromatic polyamides), the meta- and the para structure.
![](/images/werkstoffe/aramid/kevlar1.jpg)
Aramids are hardly flammable, but the flame goes out as soon as the fire source is removed. The fibres do not melt and provide good flame-retardant properties. At high temperatures the fibres start to carbonize. After several days at a continuous temperature of 250 °C, the residual tensile strength is still 50% of the initial strength. Aramid shows a small thermal expansion and a low heat transfer coefficient. Aramids are resistant to bacteria, mould as well as most solvents, lubricants and salt water. However, aramids are degraded by strong acids and alkalis.
Para-aramid displays a high tensile strength, temperature resistance and resistance to alternating bending. Thus para-aramid is used in ballistic applications and as reinforcement in plastics. Para- aramid with a PTFE or silicone coating is used as material for conveyor belts, edge reinforcements and as sheets for compactors.
Due to its textile character, meta-aramid is used as a staple fibre in flame-retardant textiles. Meta- aramid fabrics are used as edge reinforcements and reinforcements for conveyor belts. Fabrics based on meta-aramid are not suitable for PTFE or silicone coating due to their filamentation and the resulting rough surface. In addition, the high strain is not acceptable.
Contact Person
![](/images/ansprechpartner/kastilo_philipp_kuemmerle.png)
Philipp Kümmerle
Customer Support & Technology
This email address is being protected from spambots. You need JavaScript enabled to view it.
![](/images/ansprechpartner/MatthiasGruebel.jpg)
Dr. Matthias Grübel
Development
This email address is being protected from spambots. You need JavaScript enabled to view it.