Hawach scientific filter paper is divided into fast, medium, and slow speeds. It can meet the needs of different levels of purity, hardness, flow rate, loading capacity, and chemical resistance for our customers.
Hawach Scientific Co., Ltd provides qualitative and quantitative cellulose filter paper. The qualitative filter paper ash content is less than 0.15%. Quantitative filter paper ash content is less than 0.01%.
The qualitative filter paper includes standard filter papers and wet-strengthened filter papers. The qualitative filter paper is used to identify the properties of substances in qualitative analysis. Wet strength qualitative filter paper contains a small amount of chemically stabilized resin, thereby enhancing the wet strength. This does not introduce any obvious impurities into the filtrate. However, because of resin containing nitrogen, these grades of filter paper cannot be used for the determination of Kjeldahl nitrogen.
The quantitative filter paper is mainly used for the filtration after the filtration, that is, the weight method analysis test and the corresponding analysis test in the quantitative chemical analysis. The ash weight of each filter paper is a fixed value.
The choice of flow rate for the filter paper depends on the nature of the separation material precipitation. The fast filter paper is used for colloidal precipitation and the slow filter paper for crystal precipitation.
The hardened ashless filter paper has very low ash content, acid hardening increases wet strength and chemical resistance. It can be applied to most major filtration processes because of its hard surface. There are different grades available in HAWACH.