Stopper heads are made of high alumina raw material and  high grade graphite , throgh high-pressure molding and 1300°C high temperature treatment, suitable for flowing control at casting steel.

Charactor

1. good refractoriness

2.excellent thermal shock and thermal spaling resistance.

3.high cold compressive strength

4.good resistance to abrasion and corrosion

Package

     Packing by carton, about 18 cartons in a  fumigation wooden pallet, covered with plastic shrink film.

Quality control 

       All process from raw material to final product are strictly tested by equipment. Content of test includes bulk density, al2o3, cold compressive strength, refractoriness, etc.