MPD-I
Meta-aramid (Nomex)
Glass Transition (Tg)
~275 °C
Melting Point (Tm)
— (decomposes)
Density
1.38 g/cm³
CAS Number
24938-60-1
Recycling Code
♺ 7
Category
High-Performance
Repeat Unit
–[NH–C₆H₄–NH–CO–C₆H₄–CO]ₙ– (meta)
The repeating unit is the smallest structural fragment whose repetition builds the whole chain. Subscripts show the relative share of each unit in copolymers.
Key Properties
Meta linkage gives a kinked chain — lower modulus than Kevlar but excellent thermal and flame protection with good textile processability.
Applications
Flame-resistant clothing, electrical insulation paper, honeycomb cores.