Nomex materials are made of high-temperature-resistant aromatic
polyamide fibres which - equivalent to HDC materials - are woven of
staple fibre yarns, i.e. yarns that are spun of short thin
The final yarn is made by twisting two yarns into one yarn that
is used both in warp and weft direction (length- and crosswise of
fabric). The result is a fabric that is capable of carrying a large
amount of dust without blocking the air flow through the material.
Such blocking would require washing of the textile duct to ensure
the distribution of the calculated quantity of air at the
calculated pressure loss.
Similar to Trevira CS, Nomex materials are flame retardant,
however, Nomex holds the extra feature of having a very high
melting and self-ignition temperature. Nomex does not melt but
decomposes at 370°C. Nomex materials for TBV are mostly applied in
the shipping industry.