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I am writing to request an inquiry about your product.Ether carbon fourSpecificationMain active components and concentration range (w%):1,3- butadiene: 40%Isobutylene:2.5-3.5%Butenes : 15-30%Butanes : 5-15%Please provide unit price (CIF to RIZHAO port in CHINA ) and testing report of products, including main active components.