used in cleaning and blasting Molds, Apparatus, Plastics, Gold and silver jewelry, Glasses, Watches, Golf Club, Barrette, Button Walnut shellThe Walnut Shell Grain can be ... used in cleaning and blasting Molds, Apparatus, Plastics, Gold and ... 3% Specific Gravity 1.28% PH Value 4 6% Abrasives Walnut shell