Whatman No. 4

Name: Whatman No. 4
Brand: Whatman
SKU: 76397
Availability: PreOrder

UsedWhatmanFiltration suppliesNetherlands

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Length: 460 mm
Width: 570 mm
Thickness: 205 μm
Pore Size: 20-25 μm
Ash Content: ≤0.06%
Availability: Procurable
Lead time: Confirmed with your quote

All 14 specifications

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Specifications 14

Brands: Whatman
New/Used: Used
Length: 460 mm
Width: 570 mm
Thickness: 205 μm
Weight: 92 g/m²
Pore Size: 20-25 μm

Ash Content: ≤0.06%
Wet Burst: 0.22 psi
Filtration Speed (Herzberg): 37 s/100 mL
Sample Handling - Format: Sheets
Sample Handling - Dimensions: 460 mm × 570 mm
Availability: Procurable
Lead time: Confirmed with your quote

Product description

High-flow cellulose filter paper for rapid filtration of coarse particles and gelatinous precipitates.

Whatman™ Grade 4 Qualitative Filter Paper is a high-flow-rate cellulose filter designed for rapid filtration of coarse particles and gelatinous precipitates. This filter paper is widely used in various scientific applications, including biotechnology, environmental monitoring, and clinical diagnostics.

Key features:

High flow rate: Ensures efficient filtration, reducing processing time.
Coarse particle retention: Effectively captures particles and precipitates such as ferric hydroxide and aluminium hydroxide.
Versatile formats: Available in circles, sheets, rolls, and prepleated versions to suit diverse laboratory needs.
Low ash content: Minimises interference in analytical procedures.

Applications:

Biotechnology: Essential for rapid filtration in molecular biology workflows, including nucleic acid purification and protein assays.
Environmental monitoring: Utilised in air pollution studies where high flow rates are required, and fine particle collection is less critical.
Clinical diagnostics: Employed in routine clean-up of biological fluids and organic extracts during analysis.

Commonly used in:

University laboratories
Biotechnology research centres
Environmental monitoring agencies
Clinical diagnostic labs

Introduced by Whatman™, a brand with a legacy dating back to 1740, this filter paper continues to be a staple in laboratories worldwide, reflecting its enduring relevance and reliability.

Why Questpair exists

Lab equipment markets are fragmented. Buyers spend weeks calling distributors, comparing quotes, and verifying supplier reliability. Sellers struggle to reach global research labs.

We built Questpair to fix this. Every supplier on the platform is verified before listing. Every quote you receive comes from a real, vetted seller. AI prepares your case in minutes, then a real specialist takes over.

We're an independent team based in The Netherlands, working with research labs and procurement teams across Europe and worldwide.

Frequently asked questions

How long does laboratory equipment typically last?

With a service contract, ten to fifteen years is normal for most benchtop instruments. Detectors and pumps are the parts that wear first.

Can I get service for older equipment?

Often, yes. Verified suppliers frequently work with service partners converting the instrument. If applicable, we can list servicing options alongside the offer.

Where can I buy parts?

Ask a scientist through the request button. Parts are often available even when the instrument itself is discontinued.

What is the typical lead time for refurbished equipment?

Two to six weeks, depending on refurbishment scope and whether calibration is included.

Does laboratory equipment ship internationally?

We ship to 38 countries. Crating and customs handling are quoted with the instrument.