Whatman® Quantitative Filter Paper, Ashless, Grade 42 Circles, Diam. 125 Mm, Pack Of 100

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thickness: 200 μm
ash content: ≤0.007%
pore size: 2.5 μm (Particle retention)

Diameter

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Specifications:

Application	Filtration, Analytical Chemistry
Storage Temperature	Ambient
Product Type	Filter Papers
Product Brand	Whatman™, Cytiva
Product Grade	Analytical grade

Overview
Resource

The Whatman™ Grade 42 Quantitative Filter Papers are premium ashless cellulose filters designed for high-precision gravimetric analysis and critical laboratory applications. Offering the finest particle retention (~2.5 µm) among all Whatman ashless grades, these filters are ideal for applications requiring maximum clarity, purity, and analytical accuracy.

With an extremely low ash content (≤0.007%) and high chemical purity, Grade 42 filter papers are specifically suited for trace analysis, environmental testing, and instrumental sample preparation, where even minimal contamination can impact results.

Key Features

Finest Particle Retention

Nominal retention of ~2.5 µm, the finest among Whatman ashless grades
Effectively removes fine particulates and impurities
Ideal for sensitive analytical and instrumental workflows

Ultra-Low Ash Content

Maximum ash content of ≤0.007%
Ensures minimal residue after combustion
Critical for accurate gravimetric and elemental analysis

High-Purity Cellulose Composition

Manufactured from refined cellulose fibers
Minimizes background contamination
Suitable for trace element and radionuclide analysis

Designed for Critical Gravimetric Analysis

Commonly used for precipitates such as:
- Calcium carbonate
- Barium sulfate
- Metastannic acid
Ensures reliable mass measurements after filtration and ashing

Fine Filtration with Controlled Flow

Slow filtration speed (Herzberg ~1870 seconds)
Allows thorough separation of fine particles
Improves analytical precision in complex samples

Applications

High-precision gravimetric analysis
Environmental testing (soil and water filtration)
Trace element and radionuclide collection
Sample preparation for ICP, AAS, and other instrumental analysis
Filtration of fine precipitates and suspensions
Analytical chemistry and research laboratories
Industrial quality control and environmental monitoring

Technical Specifications

Parameter	Specification
Product Type	Quantitative Filter Paper (Ashless)
Grade	Whatman Grade 42
Material	Cellulose
Ash Content	≤0.007%
Particle Retention	~2.5 µm
Filtration Speed	Slow (Herzberg ~1870 s)
Format	Circles / Sheets
Application	Gravimetric and instrumental analysis
Pack Size	100 sheets per pack

Available Models and Ordering Information

Catalog Number	Diameter / Size	Format	Pack Size
1442-042	42.5 mm	Circles	100/pk
1442-047	47 mm	Circles	100/pk
1442-055	55 mm	Circles	100/pk
1442-070	70 mm	Circles	100/pk
1442-079	79 mm	Circles	100/pk
1442-090	90 mm	Circles	100/pk
1442-110	110 mm	Circles	100/pk
1442-125	125 mm	Circles	100/pk
1442-150	150 mm	Circles	100/pk
1442-185	185 mm	Circles	100/pk
1442-240	240 mm	Circles	100/pk
1442-320	320 mm	Circles	100/pk
1442-6551	25.4 × 90 mm	Sheets	100/pk
1442-917	460 × 570 mm	Sheets	100/pk

Workflow Integration

Sample Preparation → Fine Filtration (Grade 42) → Drying / Ashing → Gravimetric or Instrumental Analysis

This ensures:

Maximum removal of fine particulates
Minimal background contamination
Highly accurate analytical results

Unique Advantages

Finest particle retention among ashless Whatman grades
Ideal for trace analysis and sensitive instrumentation
Ultra-low ash content ensures accurate gravimetric results
High purity supports environmental and elemental analysis
Reliable performance for critical laboratory workflows
Wide range of sizes for flexible application

The Whatman™ Grade 42 Quantitative Filter Papers (Ashless) are the gold standard for laboratories requiring maximum filtration precision and analytical accuracy. With their fine retention, ultra-low ash content, and suitability for trace-level analysis, they are indispensable for advanced gravimetric, environmental, and instrumental applications.