国产免费无套视频在线观看,国产精品久久久久久久久久两年半,国产精品无码ThePorn,国产精品亚洲天堂网不卡

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.

?