The woven conveyor belt, particularly in a plain weave, for the heat treatment of products, particularly textile threads, in the vapor phase, comprises warp threads exclusively made of para-aramid or para-aramid copolymer, preferably of a copoly-(paraphenylene/3,4′-oxydiphenylene terephthalamide). Preferably, the warp threads and the weft threads are made exclusively of para-aramid or para-aramid copolymer.