Filter Papers

Hawach Scientific Co., Ltd. manufactures cellulose filter papers for both qualitative and quantitative analysis. The product line includes standard filter papers and wet‑strengthened grades that can meet different levels of purity, hardness, flow rate, loading capacity and chemical resistance. Wet‑strengthened papers contain a small amount of chemically stabilised resin, which improves strength when wet but introduces nitrogen, making them unsuitable for Kjeldahl nitrogen determination. The ash weight of each quantitative filter paper is a fixed value used in gravimetric methods.

The base material is high‑purity cellulose, a common choice for laboratory filtration due to its low extractable content. Typical basis weight for standard cellulose filter paper ranges from 70 to 120 g/m², and pore size usually falls between 0.2 and 5 µm depending on the grade. Sheet dimensions are often supplied in A4 size (210 mm × 297 mm) or custom cuts, with thickness around 0.1‑0.3 mm. Moisture content is kept below 5 % to ensure consistent performance across batches.

These filter papers are widely used by analytical laboratories, quality‑control labs in the pharmaceutical sector and environmental testing facilities. Buyers should confirm the required grade, sheet size and any special wet‑strength requirements before placing an order. Trade terms such as minimum order quantity, packaging format and Incoterms are not listed and must be agreed directly with Hawach Scientific Co., Ltd.

Hawach Scientific Co., Ltd. is located in Xi'an, Shaanxi Province, China (Room 1519‑1521, Building A1, No.32 Jinye Road, 710077). The supplier is listed with a harbour trust tier, but its response rate is currently 0.00 and there is no average response time recorded, indicating that communication may require proactive follow‑up.

The company states that it provides both qualitative and quantitative cellulose filter papers, capable of meeting varied requirements for purity, hardness, flow rate, loading capacity and chemical resistance. No additional certifications, production capacity figures or client references are disclosed in the listing.