Specifications
Specifications
Below are standard specifications for qualitative filter paper. Items marked Customizable are available upon request.
Request custom specs
| Grade |
Flow Rate |
Particle Retention |
Thickness (mm) |
Filtration Time (sec) |
Typical Application |
| Grade 1 |
Medium |
11µm |
0.18 |
40 |
Most Common — Routine filtration, precipitate separation (lead sulfate, calcium oxalate) |
| Grade 2 |
Medium-Slow |
8µm |
0.19 |
55 |
Higher retention — Soil nutrient analysis, monitoring specific pollutants |
| Grade 5 |
Slow |
2.5µm |
0.20 |
250 |
Most Efficient — Fine particle collection, chemical analysis |
| Grade 595 |
Medium |
4-7µm |
0.15 |
— |
General filtration, medium particle retention |
| Grade 597 |
Fast |
6-10µm |
0.16 |
— |
Coarse particle rapid filtration, pre-filtration |
Filtration time determined by Herzberg method (100ml water, 20℃, diameter 9cm).
📌 Customization Notes:
• Custom sizes available (Round: φ 55/70/90/110/125/150/185mm; Square: various; Roll)
• Special grades or pore sizes available upon consultation
* Data are typical values, actual parameters may vary slightly by batch.
Product Description
I. Overview
Qualitative filter paper is one of the most essential filtration consumables in the laboratory. Manufactured from 100% high-quality cotton linter cellulose through fine papermaking processes, it features uniform pore distribution, stable filtration efficiency, and excellent wet strength. Ideal for routine analytical separations and qualitative analysis.
Available in fast, medium, and slow flow rates to accommodate various sample characteristics and filtration requirements. The paper surface is clean, free of impurities, and contains no optical brighteners, ensuring reliable analytical results. Suitable for pH range 0-12 with a maximum operating temperature of 120℃.
II. Core Performance Parameters
- Material: 100% Cotton Linter Cellulose, α-cellulose ≥ 92%
- Particle Retention Range: 2.5µm (Grade 5) ~ 11µm (Grade 1)
- Filtration Speed (Herzberg Method): 40 sec (Grade 1) ~ 250 sec (Grade 5)
- pH Range: 0-12
- Max Operating Temperature: 120℃
- Ash Content: ≤ 0.1%
- Optical Brighteners: None
III. Material & Workmanship
Manufactured from imported high-quality cotton linter through alkalization, bleaching, and refining processes to produce high-purity cellulose pulp. Precision-formed using cylinder paper machines to ensure uniform fiber distribution and consistent thickness. All products undergo rigorous quality testing, including pore size distribution, filtration speed, and wet strength tests to guarantee batch-to-batch consistency.
All products are cut and packaged in cleanroom environments to prevent secondary contamination.
