Half Ton - High Purity USA 70/30% N-Butane/Propane Blend - 99.5% GuaranteedHalf Ton High Purity USA 70 30% N Butane Propane Blend 99. 5% Guaranteed Ultra high purity 70 30% N Butane Propane is USA sourced, and guaranteed to be 99. 5% pure. This instrument grade solvent helps to produce a higher quality extract by reducing mystery oils and contaminants. Solvent comes in a DOT refillable LP tank. KEY BENEFITS: Free of any hydrogen Sulphide based Ethyl Mercaptan Odorants. This product is clean, colorless, and odorless. Tank has