... molecular weight 400-800. No toxicity, soluble in water, high chemical and thermal stability, decomposed temperature above 330 ... crude oil evaporation, petroleum pipeline, and industrial circulating cool water systems. In addition, HPMA has good corrosion inhibition effect ... at dosage of 1-15ppm for circulating cool water system, oilfield fill water, crude oil dewatering and low-pressure boilers. ...