... fume, it is a very fine pozzolanic material, composed of amorphous silica produced by electric ... , and mortars as well as elastomeric, polymer, refractory, ceramic and rubber applications.Jihe Microsilica JH85Microsilica JH85 ... concrete and mortars.Microsilica JH85 is a pozzolanic material that consists primarily of fine silicon dioxide ... ’needs) densified microsilica fume for refractory material