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--- CALCIUM CARBIDE TECHNICAL INFO Grade descriptions and technical Calcium Carbide technical info: Calcium Carbide Grade Descriptions 14ND (fine grade) GAS YIELD (Percent CaC2; Cubic Feet Acetylene/Pound): Minimum Purity / Gas Yield: 70.0% / 4.18 cft./# SIZING: Pass through 0.0937" (2.4 mm. / 8 mesh U.S.) 100% MinimumPass through 0.0165" (0.4 mm. / 40 mesh U.S.) 5% Maximum Miner’s (lamp grade-pea size 1/2" x 1/4") GAS YIELD (Percent CaC2; Cubic Feet Acetylene/Pound): Minimum Purity / Gas Yield: 75.4% / 4.50 cft./# SIZING: Pass through 0.625" (15.9 mm.) 100% MinimumPass through 0.0937" (2.4 mm. / 8 mesh U.S.) 5% Maximum NUT grade (ROCKS 11/4" x 3/8")GAS YIELD (Percent CaC2; Cubic Feet Acetylene/Pound): Minimum Purity / Gas Yield: 75.4% / 4.50 cft./# SIZING: Pass through 1.25" (31.8 mm.) 100% MinimumPass through 0.25" (6.4 mm.) 5% Maximum Stoichiometry The percentage of acetylene gas to air for complete combustion is 7.73%.If you were to fill a 55 gallon drum with the proper fuel/air mix, this is how much CaC2 you would need.55 gal = 7.35 cu/ft x 7.73% = 0.57 cu/ft of acetylene gas needed for proper mixture14ND produces 0.26 cu/ft per ounce. 2.2 ounces needed.Miner's and NUT grade produce 0.28 cu/ft per ounce. 2 ounces needed