Whatman™ Quantitative Filter Papers, Hardened Ashless, Grade 541

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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 541 Quantitative Filter Papers are high-performance hardened ashless cellulose filters engineered for fast filtration in demanding chemical environments. Designed with high wet strength and excellent chemical resistance, these filters are ideal for gravimetric analysis involving strong acids and alkalis, where durability and analytical accuracy are critical.

With a coarse particle retention (~22 µm) and rapid filtration speed (Herzberg ~34 seconds), Grade 541 filters are particularly effective for handling gelatinous precipitates and aggressive chemical samples, ensuring reliable and reproducible results in analytical and industrial laboratories.

Key Features

Hardened Ashless for Quantitative Accuracy

Extremely low ash content (≤0.006%)
Minimizes residue after combustion
Ensures high precision in gravimetric analysis

High Wet Strength & Durability

Acid-hardened cellulose structure
Maintains integrity in wet and vacuum conditions
Resistant to tearing during filtration

Superior Chemical Resistance

Designed for use with strong acids and alkalis
Suitable for aggressive chemical suspensions
Ideal for demanding analytical workflows

Fast Filtration Performance

Herzberg filtration speed of approximately 34 seconds
Enables rapid sample processing and improved efficiency

Coarse Particle Retention

Nominal retention of ~22 µm
Effective for gelatinous and coarse precipitates
Reduces clogging and enhances flow rates

Applications

Gravimetric analysis with strong acids and alkalis
Filtration of gelatinous precipitates
Determination of fiber content in animal feed
Gelatin analysis in milk and dairy products
Chloride analysis in cement
Phosphorus and chloride analysis in coal and coke
Industrial chemical analysis and quality control
Environmental and materials testing

Technical Specifications

Parameter	Specification
Product Type	Quantitative Filter Paper (Hardened Ashless)
Grade	Whatman Grade 541
Material	Acid-treated cellulose
Ash Content	≤0.006%
Particle Retention	~22 µm
Filtration Speed	Fast (Herzberg ~34 s)
Strength	High wet strength
Chemical Resistance	Strong acids and alkalis
Format	Circles / Sheets
Pack Size	100 sheets per pack

Available Models and Ordering Information (Selected)

Catalog Number	Diameter / Size	Format	Pack Size
1541-042	42.5 mm	Circles	100/pk
1541-047	47 mm	Circles	100/pk
1541-055	55 mm	Circles	100/pk
1541-070	70 mm	Circles	100/pk
1541-090	90 mm	Circles	100/pk
1541-110	110 mm	Circles	100/pk
1541-125	125 mm	Circles	100/pk
1541-150	150 mm	Circles	100/pk
1541-185	185 mm	Circles	100/pk
1541-240	240 mm	Circles	100/pk
1541-270	270 mm	Circles	100/pk
1541-320	320 mm	Circles	100/pk
1541-400	400 mm	Circles	100/pk
1541-917	460 × 570 mm	Sheets	100/pk

Workflow Integration

Sample Preparation → Filtration (Grade 541) → Precipitate Collection → Drying / Ashing → Gravimetric or Chemical Analysis

This ensures:

Reliable filtration under harsh chemical conditions
Accurate measurement of residues
Efficient processing of complex samples

Unique Advantages

Combines high wet strength with strong chemical resistance
Ideal for acidic and alkaline gravimetric analysis
Fast filtration improves laboratory productivity
Low ash content ensures accurate analytical results
Effective for gelatinous and coarse precipitates
Trusted Whatman™ quality for critical laboratory applications

The Whatman™ Grade 541 Quantitative Filter Papers (Hardened Ashless) are a robust and reliable solution for laboratories performing gravimetric analysis under harsh chemical conditions. With their fast flow rate, high durability, and ultra-low ash content, they are essential for achieving accurate and reproducible results in analytical, industrial, and environmental testing workflows.