Injection type foam type plastic sandals, foam sandals:: hard and soft foam injection type board, foam slippers coating categories: leather, inflatable products, protective cloth with paint, raincoat factory direct two small fat, bathroom mats, etc. Other PU artificial leather, insulation materials, etc:: coating, all kinds of glue size exclusion chromatography: Polyurethane is carried out by molecular size order of a chromatographic separation method, bulky molecules can not penetrate into the cavities to be gel exclusion earlier leaching out; some middle molecular volume of penetration; small molecules can penetrate into the interior completely, and finally wash out the column. Thus two small fat, sample molecules according to their molecular size has basic exclusion, outflow from the column. Macromolecules are widely used classification GB butyl ester, which is used to analyze the distribution of molecular weight macromolecules. Affinity chromatography: one of two substances having a high specific affinity for each other as a stationary phase, use with varying degrees of affinity for the stationary phase, contacting the component with the separation of impurities chromatography. For example, using enzyme and a substrate (or inhibitor), the interaction of antigen and specific antibody, hormone and receptor, lectin and polysaccharide and nucleic acid base pairs between the like, so that one of the interaction of substances covalent binding compound, used as a stationary phase for chromatography, and the other select reversibly intercepted from a complex mixture, to achieve the purpose of purification with the insoluble carrier body is formed. Can be used for separation of biological macromolecular substances, viral and cell. Or for specific interaction studies. Qinhuangdao two small fat, use two small fat, Cheung dry chemical (certified merchants) provided by the Jinan Chemical Co., Ltd., Cheung dry. Jinan Cheung Dry Chemical Co. (www.xiangqianhuagong.com) (www.dilunyierchun.com) is specialized in the "glycol" enterprise, the company of "honesty, hard service" concept, to provide you with the most quality products and services. Welcome to inquire! Contact: Mr. You can also access (www.dilunyierchun.com/supply_details_44895290.html), for more information about the company.