Precautions for Preparation and Use of Quantitative Filter Paper

HAWAHC uses natural materials to make filter paper to ensure that each piece of filter paper produced maintains a consistent high quality, renewability, and uniformity. Each filter paper has been strictly tested before the factory, including weight, thickness, gas flow and mechanical strength.

The quantitative filter paper has smooth surface, extremely low ash content, strong load capacity, good filtering effect and ideal particle interception effect. It is mainly used in gravimetric analysis trial production test and corresponding analysis experiment in quantitative chemical analysis. Hawach brand specially designs filter paper with three different flow rates to meet the needs of users with different purposes: fast, medium and slow. Different types of filter paper have different physical and chemical indicators. Different sizes and specifications, taking into account the filtration speed and particle interception effect, are mainly used for the determination of cement labels in industrial production, environmental monitoring and laboratory quantitative analysis.

Quantitative filter paper is used for precise measurements and gravimetric analysis, where accurate results are crucial. To ensure the accuracy of your analytical work and to prevent contamination, here are some important precautions to take when preparing and using quantitative filter paper:

fast flow filter paper chemistry filter paper wet strength supplier


Storage Conditions: Store quantitative filter paper in a clean and dry environment. Keep it in its original packaging or in a dust-free container to prevent contamination. Avoid exposing it to humidity or extreme temperature changes.

Handling: When handling filter paper, use clean, dry hands or laboratory gloves to minimize the transfer of oils, grease, or contaminants from your hands.

Weighing: Before use, weigh the filter paper accurately using a balance with the appropriate precision.
Avoid Touching the Filter Area: When weighing or handling the filter paper, avoid touching the filtration area (the circle or sheet where filtration will occur) to prevent contamination.


Wetting: Wet the filter paper with a small amount of the solvent or liquid you plan to filter before starting the filtration process. This helps the paper adhere to the filtration apparatus and prevents air bubbles.

Filtration Setup: Ensure that your filtration setup, including the funnel, flask, and filter paper, is clean and free from any contaminants. Rinse the apparatus with the filtrate (solvent) before starting the filtration.

Slow Filtration: Maintain a steady and slow flow rate during the filtration process. Avoid applying excessive suction or pressure, which can lead to tearing or compromising the filter paper’s integrity.

Avoid Overloading: Do not overload the filter paper with a sample that exceeds its recommended capacity. Overloading can lead to incomplete filtration and inaccurate results.

Change Filter Paper: If the filtration process takes a long time or if the filter paper becomes clogged, consider changing the filter paper to maintain efficient filtration.

Record Details: Document the filtration process in your laboratory notebook, including the date, sample information, and any relevant observations. This is essential for traceability and data integrity.


Drying: After filtration, carefully transfer the filter paper to a clean, pre-weighed container or watch glass. Dry the filter paper in an oven under controlled conditions until it reaches a constant weight.

Weighing: Weigh the dried filter paper again using the same balance with the appropriate precision. Calculate the mass of the substance retained on the filter paper by the difference between the final and initial weights of the filter paper.

Clean-Up: Properly dispose of used filter paper and any filtered residues or contaminants in accordance with laboratory waste disposal procedures.

By following these precautions, you can ensure the accuracy and reliability of your quantitative analysis and gravimetric measurements when using quantitative filter paper. Proper handling, preparation, and documentation are essential to obtaining precise results in analytical chemistry and research.