What is the new material PA
                Shengye
                The country’s support for rural areas is increasing. In rural areas, the sewage treatment facilities for septic tanks and toilets in rural areas are not perfect. Sewage septic tanks and public toilets in farms lead to odor, fecal agglomeration, and partial discharge of sewage. Some ... Read More
                How to measure the viscosity of engineering plastics
                Shengye
                PA66 engineering plastic is a kind of high polymer with appropriately high molecular weight. The molecular weight directly affects its physical and chemical properties such as mechanical strength and heat resistance. The method of estimating molecular weight is to determine the relative viscosity of high ... Read More
                Engineering plastic polycondensation method
                Shengye
                PA66 engineering plastic is a condensation polymer that uses hexamethylenediamine and adipic acid as monomers and is connected by amide bonds. It has high strength, good resistance, and excellent performance such as wear resistance. It is used in automobiles, electronics and textiles. Has a wide ... Read More
                
	
                

                










日本一区二区三区精品视频|国产在线视频二区人妖|无码专区人妻系列制服|99国产亚洲精品俞拍视频|欧美日韩国产精品自线在线|久久99精品亚洲热综合|久久精品无码一区二区韩Av