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Dongying City Dayong Petroleum Additives Co., ltd.
Oilfield Drilling Mud Addtive Sulphonated Asphalt / High Acid Soluble Sulphonated Asphalt
Oilfield Drilling Mud Addtive Sulphonated Asphalt / High Acid Soluble Sulphonated Asphalt
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Sample Price US $ 1
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