Whatman™ Quantitative filter papers, ashless, grade 40

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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 40 Quantitative Filter Papers are high-purity, ashless cellulose filters designed for general-purpose gravimetric analysis and analytical filtration. With an extremely low ash content (≤0.007%), these filters ensure minimal residue after combustion, making them ideal for applications where accuracy and low background contamination are critical.

Featuring a medium particle retention (~8 µm) and moderate filtration speed (Herzberg ~340 seconds), Grade 40 filter papers provide a balanced combination of retention efficiency and flow rate, making them suitable for a wide range of laboratory and environmental applications.

Key Features

High-Purity Ashless Composition

Maximum ash content of ≤0.007%
Minimizes contamination during gravimetric analysis
Ensures accurate analytical results

Balanced Filtration Performance

Medium particle retention of ~8 µm
Moderate flow rate for controlled filtration
Suitable for general analytical applications

Designed for Gravimetric Analysis

Ideal for quantitative analysis workflows
Ensures reliable mass measurement after ashing
Supports accurate elemental and compositional analysis

High-Quality Cellulose Material

Made from refined cellulose fibers
Consistent filtration performance across batches
Suitable for routine and advanced laboratory use

Applications

Gravimetric analysis in analytical chemistry
Soil analysis and environmental testing
Determination of sediment in milk and dairy products
Sample preparation for atomic absorption (AAS) spectrometry
Analysis of cement, clay, iron, and steel components
Collection of trace elements and radionuclides
General laboratory quantitative filtration

Technical Specifications

Parameter	Specification
Product Type	Quantitative Filter Paper (Ashless)
Grade	Whatman Grade 40
Material	Cellulose
Ash Content	≤0.007%
Particle Retention	~8 µm
Filtration Speed	Medium (Herzberg ~340 s)
Format	Circles
Application	Gravimetric and analytical filtration
Pack Size	100 sheets per pack (varies by model)

Available Models and Ordering Information

Catalog Number	Diameter	Format	Pack Size
1440-012	12.7 mm	Circles	400/pk
1440-032	32 mm	Circles	100/pk
1440-329	30 mm	Circles	100/pk
1440-042	42.5 mm	Circles	100/pk
1440-047	47 mm	Circles	100/pk
1440-055	55 mm	Circles	100/pk
1440-070	70 mm	Circles	100/pk
1440-090	90 mm	Circles	100/pk
1440-110	110 mm	Circles	100/pk
1440-125	125 mm	Circles	100/pk
1440-150	150 mm	Circles	100/pk
1440-185	185 mm	Circles	100/pk
1440-240	240 mm	Circles	100/pk
1440-320	320 mm	Circles	100/pk
1440-6168	450 mm	Circles	100/pk

Workflow Integration

Sample Preparation → Filtration (Grade 40) → Drying / Ashing → Gravimetric or Instrumental Analysis

This ensures:

Controlled filtration of medium-sized particles
Minimal residue interference
Accurate analytical measurements

Unique Advantages

High purity with ultra-low ash content for precise analysis
Balanced retention and flow rate for versatile applications
Ideal for general gravimetric and environmental analysis
Suitable for trace element and material testing workflows
Available in a wide range of sizes for flexible laboratory use
Trusted Whatman™ quality for consistent performance

The Whatman™ Grade 40 Quantitative Filter Papers (Ashless) provide a dependable and versatile solution for laboratories performing general-purpose gravimetric and analytical filtration. With their low ash content, balanced performance, and broad application compatibility, they are an essential tool for environmental, industrial, and analytical laboratory workflows.