中文字幕第一页在线视频_www.av在线免费观看_亚洲区av_素人av在线_一区二区三区久久久_暴力调教一区二区三区_青青青av_亚洲AV无码成人国产精品色_欧产日产国产69_国产日产欧美_在哪里可以看黄色片_一区久久

Product characteristics

Dowex series of ion exchange chromatography separation resins are divided into two categories: strong acid cation exchange resin and strong basic anion exchange resin. Each category is divided into three categories according to the different degree of crosslinking (DVB%). Each category is represented by "× 2", "× 4" and "× 8". On this basis, three particle size ranges are provided, namely 150-300 μ m (50-100 mesh) and 75-150 μ m (100 mesh) -200 mesh) and 35-75 μ m (200-400 mesh), a total of 18 resin brands. Obviously, the resin with different crosslinking degrees has different water content, volume exchange capacity and material diffusion resistance. Such a wide range of products enriches the trial selection of customers, and suitable chromatographic separation resin can be selected for specific application.

The framework materials of Dowex series ion exchange chromatographic separation resins are all styrene divinylbenzene, which are prepared on a large scale by special suspension polymerization process and have good chemical and physical stability. Easy packed column, small diffusion resistance of target components, stable product quality. Therefore, Dowex series ion exchange chromatography separation resin can not only meet the small-scale test process development of laboratory food, medicine and other fine chemical products, but also make the process amplification easier.

?