Sartorius Grade 389 – White Dot Quantitative Filter Paper Discs (Equivalent to Grade 41)

Sartorius Grade 389 quantitative filter paper is a medium-fast filtering paper specifically designed for analytical applications requiring ash-free results and reliable precision. Composed of 100% cotton linters with an α-cellulose content exceeding 98%, this paper is acid-washed and ash-free (≤ 0.01%), ensuring high purity and preventing contamination of analytical results. The wet-strengthened construction makes it ideal for use in pressure or vacuum filtration setups, offering mechanical durability during filtration processes.

This white dot coded grade features a medium- to wide-pore structure, with a particle retention range of 8–12 µm and a filtration time of approximately 20 seconds, making it well-suited for handling medium-fine crystalline precipitates. It is commonly used for tasks like fat content determination in natural materials or filtration in cement testing (Blaine method). Its equivalent to Whatman Grade 41, offering a comparable performance standard trusted in labs worldwide.

Filter discs are available in a variety of diameters to accommodate different apparatus requirements.

Available Sizes and Product Codes