Mega a3 and a4 white fibreglass sheets 2mm thick for sublimation printing mega electronics 71 2000 a3 p an a3 sized blank white fibreglass sheet suitable for sublimation printing p p fibreglass is an excellent self supporting material for signs and panels it is also suitable for imaging and cnc routing in school projects p mega electronics 71 2000 a3 a3 white fibreglass 2mm thick