Laboratory Sheet Filter Paper

Hawach Scientific specialized in filtration products for more than decades years. All our filter papers are made from the imported membrane in the cleanroom. Before release to market, the products are consigned to the QC department for random inspection.

In analytical chemistry, the residue collected on the filter paper after the inorganic compounds are filtered out of the sediment can be used to calculate the rate of loss during the experiment. Qualitative filter paper produces more cotton fiber after filtration, so it is only suitable for qualitative analysis; Quantitative filter paper, especially the ash-free filter paper, can resist chemical reaction effectively after special treatment, so the impurities generated are less, which can be used for quantitative analysis.

Here are some key characteristics and information about laboratory sheet filter paper:

  1. Material Composition: Filter paper is typically made from cellulose fibers derived from wood pulp. It can also be composed of synthetic materials like glass fibers or a mixture of cellulose and synthetic fibers.
  2. Pore Size and Porosity: Filter paper comes in various grades, each with different pore sizes and porosities. The choice of grade depends on the specific application and the size of particles you need to filter.
  3. Thickness and Weight: Filter paper comes in different thicknesses and weights. Thicker paper is often used for processes that involve large particle filtration or require higher flow rates, while thinner paper is suitable for finer filtration.
  4. Fast vs. Slow Filtration: Some grades of filter paper are designed for fast filtration, allowing for quick separation of solids from liquids. Others are more suited for slower filtration processes, providing finer particle retention.
  5. Chemical Compatibility: It’s important to choose filter paper that is compatible with the chemicals involved in your experiment. Some filter papers are treated or coated to enhance chemical resistance.
  6. Applications:
    • Qualitative Analysis: Used to remove solid impurities from a liquid or gas in a qualitative manner.
    • Quantitative Analysis: Precise measurements of filtered substances can be obtained through methods like gravimetric analysis.
    • Chromatography: Filter paper is commonly used as a stationary phase in techniques like paper chromatography.
  7. Grades:
    • Grade 1: Coarsest filtration, used for tasks like general qualitative analysis.
    • Grade 2 to 4: Finer filtration, suitable for removing finer particles.
    • Grade 5: Very fine filtration, used for critical applications like air pollution monitoring.
  8. Handling and Storage: Filter paper should be stored in a dry environment to prevent moisture absorption. It’s also important to handle it with clean hands or gloves to avoid contaminating the filtration process.

Remember to consult the specific recommendations provided by the manufacturer of the filter paper you are using, as they may have unique characteristics or handling instructions.

Method of use
In the experiment, the filter paper is mostly used together with filter funnel and breus funnel. Before use, the filter paper should be folded into a proper shape. A common folding method is to fold the filter paper into a flower-like shape. The higher the folding degree of filter paper is, the higher the surface area can be provided and the better the filtering effect is.

However, care should be taken not to break the filter paper due to excessive folding. Place the drain glass rod on the multi-layer filter paper with even force to avoid damage to the filter paper.

Wet Strengthened Grade Filter Paper
Science Filter Papers
Qualitative Filter Papers

Hawach Technical Data

Qualitative Filter Paper Optional size
BIO-101 Fast (20-25um ), 41x45cm/ 60x60cm/90x90cm
BIO-102 Medium (8-11um), 60x60cm/65x65cm/80x80cm/85x85cm/90x90cm
BIO-103 Slow (2.5um),41x45cm/ 60x60cm

Quantitative Filter Paper Optional size
BIO-201 Fast ,60x60cm
BIO-202 Medium ,60x60cm
BIO-203 Slow ,60x60cm