Quantitative Papers/Grade 391

产品编号：FT-3-104-035 品牌：sartorius 原厂货号：FT-3-104-035
产品分类：耗材 > 过滤耗材 > 滤纸
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描述：

Description

These filter papers are made of refined pulp and linters with over 98% alpha-cellulose content. They are guaranteed to be free of any residual acids and they have an extremely low percentage of ash content (<0.01 % according to DIN 54370). As a result, these filters are virtually ash-free.

All Sartorius ashless filter papers are characterized by high wet strength and high purity and are therefore especially suitable for quantitative analysis, Buechner funnels, pressure or vacuum filtration.

They are available in different formats as in rolls, sheets, discs and folded filters.

注意事项：

Quantitative Papers

Filtration rate: the time required to filter 10 ml of distilled water at 20 °C through a free-hanging, fully-wetted disc filter with a diameter of 110 mm folded in quarters. Expressed in seconds (per mm).

Color-doted dot	Grade	Precipitation	Properties	g/m²	Particle retention (µm)	Filtration rate (s)
Black dot	388	Coarse crystalline	Wide-pored,spongy structure, high rate of filtration	84	12-15	10
White dot	389	Medium-fine crystalline	Medium-wide-pored, medium-fast rate of filtration	84	8-12	20
Yellow dot	389F	Medium-fine crystalline	Medium-wide-pored, medium-fast rate of filtration, low-fat content	84	8-12	20
Red dot	392	Fine crystalline	Medium density, moderately fast rate of filtration	84	5-8	50
Green dot	390	Fine crystalline	Narrow-pored, dense, slow rate of filtration	84	3-5	100
Blue dot	391	Very fine crystalline	Fine-pored, highly dense, very slow rate of filtration	84	2-3	180
Purple dot	393	Very fine crystalline	extra fine-pored and dense, very slow rate of filtration	100	1-2	300