... bags with superior quality and all kinds of size as your request. Specification: 2012 New Virgin Polypropylene Valve ... magnesium chloride, carbon black, building material, cellulose etc. Chemical products and cement, forage, fertilizer, foodstuff, salt, sugar, starch, food ... powder or grain goods at the bag top, and the seal is simple and easy.FeatureAnti-slip;waterproof; uvioresistant; recyclable; ...