Laboratory Filter Paper Manufacturer
Bulk Supply & OEM Customization
Qualitative, quantitative ashless, vacuum & industrial grades. Designed for routine lab filtration, gravimetric analysis, and industrial process. Compatible with standard filtration methods. Wholesale, distributor programs, private label.
Common Problems in Laboratory Filtration
We provide validated equivalent grades with technical proof. Send your current grade → solution in 24h.
Procurement Decision Table – Match Problem to Grade
| Problem | Symptom | Best Grade | Risk if Wrong Grade |
|---|---|---|---|
| Slow filtration | Funnel overflows, long process time | Grade 4 or 41 | Clogging, sample loss, low throughput |
| Poor retention of fine particles | Turbid filtrate, solids in eluent | Grade 44, 42 or 5 | Invalid analytical results, rework |
| Paper tears in vacuum setup | Disc fragments, lost sample | Grade 91 or Grade 113 | Process failure, contamination |
| Ash residue after combustion | Gravimetric error, non‑zero tare | Grade 40–44 (ashless) | Failed QC, OOS investigation |
| Heavy solids block filter quickly | Pressure build‑up, low throughput | Grade 113 | Frequent filter change, high cost |
Trusted globally
Major pharmaceutical companies
Available on request
Certified quality system
We confirm compatibility before you switch supplier
Qualitative Grades – Routine & High Retention Lab Filtration
Performance-equivalent for common reference grades · Routine to fine particle capture
Qualitative grades for daily lab filtration, environmental water testing, food QC, and general chemistry. Our qualitative series (1,2,4,5,6) are ideal for clarification, precipitate collection, and solids analysis. Ash content 0.15% (Grade 6: <0.1%), high‑purity cotton cellulose. Grade 6 offers 3 µm retention with slow flow.
Quantitative Ashless – Gravimetric Analysis
Ashless for gravimetric analysis · Precisely controlled <0.01% ash
Ashless grades for precise gravimetric analysis, residue determination, and metal analysis. Quantitative series (40,41,42,43,44) meet USP, AOAC, and EPA methods. Consistent quality and OEM customization. Ash content <0.01%.
Wet Strengthened Grades – Industrial & Vacuum Filtration
High durability for vacuum systems, pressure filtration and slurry
Reinforced wet‑strengthened grades for vacuum manifolds, pressure filtration, and high‑solid loading. Grade 91 (10 μm wet strength), Grade 113 (30 μm high load). Ideal for industrial process and slurry filtration where standard papers may tear.
Grade Replacement System – Quick Reference
Find your Hawach equivalent using the table below. Performance verified with batch‑to‑batch consistency.
| If you are using | Hawach Equivalent | Key Specs | Benefit |
|---|---|---|---|
| Standard Flow (11μm) | Grade 1 | 11μm, medium flow, 0.15% ash | Same retention, lower cost |
| Fine retention (8μm) | Grade 2 | 8μm, slow flow, 0.15% ash | Batch consistency |
| Fast flow (20-25μm) | Grade 4 | 20-25μm, fast flow, 0.15% ash | Available in bulk rolls |
| Very fine retention (2.5μm) | Grade 5 | 2.5μm, very slow flow, 0.15% ash | Maximum particle capture (qualitative) |
| High retention (3μm) | Grade 6 | 3μm, slow flow, <0.1% ash | Fine precipitate / boiler water analysis |
| Ashless medium (8μm) | Grade 40 | 8μm, <0.01% ash, medium flow | Gravimetric analysis |
| Ashless fast (20μm) | Grade 41 | 20μm, <0.01% ash, fast flow | High‑throughput |
| Ashless fine (2.5μm) | Grade 42 | 2.5μm, <0.01% ash, very slow | Critical precipitate |
| Ashless balanced (16μm) | Grade 43 | 16μm, medium-fast, <0.01% ash | Speed & accuracy balance |
| Ultra-fine (3μm) | Grade 44 | 3μm, <0.007% ash, slow flow | Max particle retention |
| Wet-strengthened (10μm) | Grade 91 | 10μm, medium flow, wet‑strengthened | Vacuum/pressure filtration |
| High-load industrial (30μm) | Grade 113 | 30μm, fast flow, high capacity | Heavy solids separation |
How to Select the Right Grade
| Need / Application | Recommended Grade | Key Property |
|---|---|---|
| Routine lab filtration, clarification | Grade 1 | 11 μm, medium flow |
| Fast coarse filtration, high throughput | Grade 4 | 20-25 μm, fast flow |
| Fine particle retention, analytical prep | Grade 2 / Grade 5 | 8 μm / 2.5 μm retention |
| High retention with better flow | Grade 6 | 3 μm, slow flow, <0.1% ash |
| Gravimetric analysis, low ash | Grade 40 / 41 / 42 / 43 / 44 | Ash <0.01% |
| Vacuum manifold filtration | Grade 91 / Grade 113 | Wet strength, reinforced |
| Heavy particle loading, industrial slurry | Grade 113 | 30 μm, high capacity |
Typical Applications by Industry
Gravimetric analysis, dissolution prep, residue testing
Water TSS, wastewater solids, air monitoring
Sugar clarification, edible oil analysis
Routine filtration, student labs
Slurry filtration, high‑solids separation
Available Formats & Customization – Bulk & OEM
55/70/90/110/125/150/185 mm
Square sheets, slit rolls
Pre‑pleated
Logo, packaging, barcode
Manufacturing & Quality Control – Factory Direct
1‑Minute Summary – Your Path to a Better Supply
Based on retention, speed, or application
We match performance specs
With validation data and sample support
Frequently Asked Questions
What is the difference between qualitative and quantitative?
Qualitative has higher ash content (0.15%); quantitative ashless <0.01%.
What is Grade 43 used for?
Grade 43 (16 μm) is an ashless quantitative paper with medium‑fast flow, balancing speed and analytical accuracy. Ideal for routine gravimetric analysis, food testing, and environmental monitoring where throughput matters.
What is Grade 44 used for?
Grade 44 (3 μm) is an ultra-fine retention ashless quantitative paper. It is a thinner version of Grade 42 with nearly twice the flow rate and lower ash weight per sample, designed for maximum particle retention in critical gravimetric work.
Can standard qualitative paper be used for vacuum?
Standard grades may tear. Use wet‑strengthened Grade 91 or 113 for reliable vacuum performance.
Do you provide samples before bulk order?
Absolutely. Request evaluation samples.
Can I start with a small test order and then scale up?
Yes, we support low MOQ trial orders. After validation, we help you scale with consistent pricing, lead time, and batch traceability.
Send Your Current Filter Paper – Get Validated Equivalent + Quote in 24h
Stop overpaying or risking inconsistency. Tell us the brand and grade you are using → we will reply with a matching equivalent, datasheet, and a competitive quote.
