Fine grade BLACK BEAUTY: Utilized for new construction, light paint and rust removal and special maintenance applications requiring reduced profiles.Fine Grit 20/40 Blast MediaUse Fine for new construction, light paint and rust removal, and for special maintenance applications requiring reduced profiles. Bridge maintenance, light mill scale, paint and rust, new structural steel.*Minimum suggested nozzle size of 3/16 in. and under standard blasting conditions will achieve a 2.0-3.8 Mil profile*Quantity: 75 lbs. bagFeatures and BenefitsLow free silica less than 0.1% compared to sand at up to 99% free silicaFast cuttingUniform densityAngular particle shapeChemically inertConsistent gradationLow dusting passes California Title 17 (CARB) (at select plants)Moisture-free media will not rust, pack, or attract dampnessGives a high degree of etch for better bondingMeets industry abrasive specifications and environmental standardsA 100% recycled, "green" productProduct Data (Typical):Free Silica: less than 0.1%Particle Shape: angular, sharpHardness: 6 to 7 on the Moh's scaleBulk Density: 75-100 lbs per cubic ftSpecific Gravity: 2.73Moisture Content: less than 0.5%Chemical Analysis:Silicon Dioxide 48.78%Aluminum Oxide 20.97%Ferric Oxide 19.08%Calcium Oxide 6.02%Potassium Oxide 1.67%Titanium Dioxide 0.94%Magnesium Oxide 0.90%Sodium Oxide 0.62%