Filter Paper Class 40 Ashless

Filter Paper Class 40 Ashless – High-Purity Quantitative Laboratory Filter Paper

Filter Paper Class 40 Ashless is a high-purity quantitative filter paper engineered for precise analytical work where the presence of ash cannot be tolerated. Manufactured from carefully refined cotton linters, this paper undergoes additional treatments to achieve exceptionally high alpha-cellulose content, ensuring chemical stability, consistent filtration, and extremely low residue after ashing.

With an ash content of ≤0.0009%, Class 40 is ideal for gravimetric analysis, metal determination, trace-level testing, and sample preparation for instrument-based analysis.

Available Sizes

22mm • 55mm • 90mm • 110mm • 125mm

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Key Features

• Ash content ≤0.0009% for true quantitative analysis

• Made from ultra-pure alpha-cellulose cotton linters

• Designed for applications requiring minimal residual ash

• Strong wet strength and stable pore structure

• High loading capacity for metal and mineral samples

• Excellent consistency between batches for analytical accuracy

• Suitable for both laboratory and industrial analytical workflows

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Applications – Where Class 40 Excels

Class 40 Ashless filter paper is specifically used in quantitative chemical analysis, especially where residue-free filtration is essential. Common uses include:

• Gravimetric analysis

• Preparation of samples for ICP, AAS, and XRF

• Metal content analysis (Zinc, Lead, Molybdenum, etc.)

• Mining and mineral processing laboratories

• High-precision quality control testing

• Separation of fine precipitates with minimal contamination

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Why Choose FilterLab Class 40 Ashless?

FilterLab Class 40 is engineered for accuracy. While standard qualitative papers may leave up to 0.13% ash, Class 40 produces almost no residue, protecting analytical results from contamination. Its enhanced alpha-cellulose structure also provides:

• Exceptional strength during wet filtration

• Reliable filtration speed and particle retention

• Superior clarity for downstream analysis

FilterLab’s ashless range includes both Class 40 and the finer Class 41, allowing laboratories to choose the retention and speed that best suit their methods.

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Delivery

We deliver throughout Johannesburg, including Pretoria, Vereeniging, East Rand, South Rand, West Rand, and provide nationwide courier shipping across South Africa.