Mon–Sat: 9:30 AM – 7:00 PM
Overview

Trusted Filtration for Labs, Food Testing & Industry

We supply a wide range of filter paper grades suited to analytical, gravimetric, industrial and general-purpose filtration — available in standard and custom sizes, with bulk pricing for institutional buyers.

📄

Qualitative (BIO-1 to BIO-6)

General-purpose filtration for routine lab work, education, and industrial applications. Ash content under 0.1%.

🧫

Quantitative / Ash-less (BIO-40 to BIO-44)

Low-ash-content grades for gravimetric analysis and precise quantitative chemical testing. Ash content under 0.007%.

💧

Wet-Strengthened (BIO-91 / BIO-113)

Reinforced grades for demanding chemistry applications such as PbSO₄ and Fe(OH)₃ precipitate filtration.

🧪

Extraction Thimbles

Cellulose and glass fiber Soxhlet extraction thimbles for solvent extraction procedures.

Specifications

Hawach BIO-Series Grades

Hawach grades are manufactured as direct equivalents to internationally recognized filter paper standards, so you can switch suppliers without changing your protocol.

Grade Type Particle Retention Ash Content Whatman Equivalent Common Use
BIO-1 Qualitative 11 µm < 0.1% Grade 1 General filtration, routine lab use
BIO-2 Qualitative 8 µm < 0.1% Grade 2 Standard laboratory filtration
BIO-4 Qualitative 20 µm < 0.1% Grade 4 Fast filtration, coarse precipitates
BIO-5 Qualitative 2.5 µm < 0.1% Grade 5 Chromatography applications
BIO-6 Qualitative 3 µm < 0.1% Grade 6 Fine particle filtration, biology grade
BIO-91 Wet-Strengthened ~10 µm < 0.1% Grade 91 PbSO₄ precipitate filtration
BIO-113 Wet-Strengthened < 0.1% Grade 113 Fe(OH)₃ precipitate filtration, chemistry applications
BIO-40 Quantitative (Ash-less) 8 µm < 0.007% Grade 40 Gravimetric analysis, medium flow rate
BIO-41 Quantitative (Ash-less) 20–25 µm < 0.007% Grade 41 Fast quantitative filtration, gelatinous precipitates
BIO-42 Quantitative (Ash-less) 2.5 µm < 0.007% Grade 42 Fine precipitates, precise gravimetric analysis
BIO-43 Quantitative (Ash-less) 16 µm < 0.007% Grade 43 General quantitative work, available in roll format
BIO-44 Quantitative (Ash-less) 3 µm < 0.007% Grade 44 Very fine precipitates, precise gravimetric analysis

Whatman is a registered trademark of its respective owner, referenced here only to indicate equivalent particle retention/application — Hawach grades are independently manufactured products.

Sizes & Packaging

Available Sizes & Formats

Discs

Standard diameters: 70mm, 90mm, 110mm, 125mm, 150mm, 185mm, 240mm, 320mm. Custom diameters available on request.

Sheets

Standard sheet sizes for cutting or bulk industrial use, sold by ream or by weight.

Rolls

Bulk rolls available for industrial and OEM filtration applications (e.g. BIO-43) — width and length on request.

Formats: disc, sheet and roll, in regular or fully customized sizes and shapes. Packaging: [Placeholder — e.g. 100 discs/pack, 20 packs/carton]. Bulk and institutional order pricing available.

Applications

Where Our Filter Paper Is Used

Chemical Analysis

Routine qualitative and quantitative chemical filtration in analytical labs.

Gravimetric Analysis

Ash-less grades for precise precipitate collection and weighing.

Food & Beverage Testing

Filtration for quality control testing in food and beverage laboratories.

Environmental Testing

Water and air quality sample filtration for environmental labs.

Pharmaceutical QC

Filtration steps in pharmaceutical quality control and R&D.

Educational Labs

General-purpose filter paper for school and college laboratories.

Industrial Filtration

Bulk filter paper for industrial process filtration needs.

Solvent Extraction

Cellulose and glass fiber Soxhlet extraction thimbles for solvent extraction procedures.

Need a Specific Grade, Size or Bulk Quantity?

Send us your filter paper requirement — grade, size, quantity — and we'll quote you promptly.

Request Filter Paper Quote