Lab Filtration Products

Quantitative Filter Paper

Quantitative filter paper is designed for gravimetric analysis in chemical and environmental testing. Made from high-purity alpha cellulose, it has an ash content below 0.01% and is acid washed and rinsed with ultrapure water to neutralize. The paper maintains high wet strength and chemical resistance under vacuum filtration and exposure to acid or alkali solutions. Available in three flow speeds-fast, middle, and slow-and diameters from 7 mm to 180 mm, it supports consistent recovery of solid residues in quantitative experiments.

Low ash content of less than 0.01% ensures minimal interference in gravimetric analysis
High wet strength and chemical resistance allow use with vacuum filtration and aggressive solvents
Three flow speeds-fast, middle, and slow-match sample particle size and load for optimal retention
Diameters from 7 mm to 180 mm cover small-scale pilot trials to larger analytical batches

Key Benefits

What This Product Gives You

Low ash content of less than 0.01% ensures minimal interference in gravimetric analysis
High wet strength and chemical resistance allow use with vacuum filtration and aggressive solvents
Three flow speeds-fast, middle, and slow-match sample particle size and load for optimal retention
Diameters from 7 mm to 180 mm cover small-scale pilot trials to larger analytical batches
Acid washed and rinsed with ultrapure water to neutralize residual ions, reducing contamination risk

Made from high-quality alpha cellulose
Ash content less than 0.01%
Weight of 80g/m² (±4)
Available in fast, middle, and slow filtration speeds
Retention range of 2-25 μm depending on speed
Diameters: 7, 9, 11, 12.5, 15, 18, 70, 90, 110, 125, 150, 180 mm, and 60×60 mm square
Acid washed and rinsed with ultrapure water to neutralize
Recommended for quantitative analysis and pilot trials

Where It Is Used

Applications And Buyers

Application Scenarios

Gravimetric analysis of metal precipitates in environmental water samples
Quantitative recovery of particulates from pharmaceutical dissolution testing
Solid residue collection in agricultural soil and fertilizer analysis
Precipitate filtration in teaching labs for undergraduate chemistry experiments
Analytical separation of suspended solids in air and water quality testing

Who It Is For

Pharmaceutical and chemical QC labs performing gravimetric analysis of impurities
Environmental testing labs measuring particulate matter in water and air
Academic and teaching labs requiring reproducible filtration for student experiments
Industrial R&D labs conducting pilot-scale trials with solid-liquid separation
Lab distributors sourcing consistent, low-ash filter paper for analytical applications

Problems It Solves

Low ash content prevents background mass from skewing gravimetric results
High wet strength prevents paper tearing during vacuum filtration of viscous or particle-laden samples
Chemical resistance allows safe use with acid and alkali solutions without degradation
Multiple flow speeds let analysts match filtration rate to sample characteristics, avoiding clogging or incomplete retention
Neutralized paper reduces ionic contamination that could interfere with trace analysis

Data

Specifications

Material	High-purity alpha cellulose
Ash Content	Less than 0.01%
Weight	80g/m² (±4)
Filtration Speed	Fast, Middle, Slow
Retention (μm)	2-25 μm
Diameter	7, 9, 11, 12.5, 15, 18, 70, 90, 110, 125, 150, 180 mm
Square Size	60×60 mm
Packing	100 pieces per pack
Wet Strength	High
Chemical Resistance	To acid and alkali solutions

Materials

High-purity alpha cellulose
Acid washed and rinsed with ultrapure water

Customization Options

Available in three filtration speeds: fast, middle, slow
Diameters from 7 mm to 180 mm and 60×60 mm square
OEM private-label packing and part numbering available through the Microlab OEM division
Custom packaging quantities and labeling can be arranged for bulk orders

How It Is Made

Manufacturing And Quality Control

Manufacturing Process

Sourcing high-purity alpha cellulose raw material
Paper formation and drying under controlled conditions
Acid washing and rinsing with ultrapure water to neutralize
Cutting to specified diameters and square sizes
Quality inspection for ash content and physical integrity
Packing in 100-piece units with speed and diameter marked

Quality Control

Ash content tested to ensure less than 0.01%
Wet strength verified under vacuum filtration conditions
Filtration speed confirmed against retention range specifications
Physical dimensions checked against diameter and square size tolerances
Visual inspection for tears, discoloration, or foreign particles

Comparison

Compared With The Alternatives

Versus Qualitative filter paper

Quantitative paper has ash content below 0.01% and is designed for gravimetric analysis; qualitative paper is for clarification and not suitable for mass-based quantification.

Versus Standard laboratory filter paper

Quantitative paper is acid washed and rinsed with ultrapure water to reduce ionic contamination, while standard paper may retain impurities that affect trace analysis.

Versus Glass fiber filters

Quantitative paper is more suitable for organic and aqueous samples with low ash requirements; glass fiber filters are used for high-temperature or high-pressure applications but are not for gravimetric analysis.

Versus Mixed cellulose ester membranes

Quantitative paper is used for solid-liquid separation in gravimetric analysis; membranes are used for particle retention in liquid chromatography and are not suitable for weighing after filtration.

Use Guide

How To Use It

Select speed based on particle size: fast for large particles, slow for fine particles
Choose diameter to match the filtration setup and sample volume
Ensure the paper is properly seated in the funnel to prevent bypass
Rinse the collected residue with ultrapure water if needed to remove soluble ions
Dry and weigh the paper with residue in a controlled environment for accurate gravimetric results
Do not use with solvents that degrade cellulose, such as strong oxidizing agents

Also In This Category

Related Industries And Guides

Environmental Testing Laboratories Chemical Analysis Laboratories Life Science and Biotechnology Vacuum Filtration Setup Guide

FAQ

Questions Buyers Ask

What is the ash content of the filter paper?

The ash content is less than 0.01%, making it suitable for gravimetric analysis.

Can this paper be used for acid or alkali solutions?

Yes, the paper is chemically resistant and can withstand acid and alkali solutions during vacuum filtration.

What are the available diameters?

Available diameters are 7, 9, 11, 12.5, 15, 18, 70, 90, 110, 125, 150, and 180 mm, and 60×60 mm square.

How many pieces are in a pack?

Each pack contains 100 pieces.

Is the paper acid washed?

Yes, the paper is acid washed and rinsed with ultrapure water to neutralize and reduce ionic contamination.

Can I get private-label packaging?

Yes, the Microlab OEM division offers private-label packing and custom labeling for bulk orders.