Coex may refer to:
- Coex, a biopolymer with flame-retardant properties
COEX, another name for the World Trade Center Seoul
- COEX Convention & Exhibition Center
- Coëx, a commune in Vendée, France
Coex is a biopolymer with flame-retardant properties derived from the functionalization of cellulosic fibers such as cotton, linen, jute, cannabis, coconut, ramie, bamboo, raffia palm, stipa, abacà, sisal, nettle and kapok. The treatment effectiveness was also proven on wood and semy-synthetic fibers such as cellulose acetate, cellulose triacetate, viscose, modal, lyocell and cupro.
The material is obtained by sulfation and phosphorylation reactions on glucan units linked to each other in position 1,4 and in particular on the secondary and tertiary hydroxyl groups of cellulosic biopolymer. The chemical modification of the fibers does not involve physical and visual alterations compared to the starting material.
in 2015 the World Textile Information Network (WTiN) declared Coex the winner of the "Future material award" as best innovation for the Home Textile category.