Representative Image

Whatman No. 3 Filter Circles 7cm/100

paper size

Specifications

Compare models
Manufacturer
Cytiva Whatman
grade/type
Grade 3 Qualitative Filter Papers
paper size
7cm
Pack size
100
Supplier Stock: 13
Delivery: 2-4 weeks

Product description

A standard grade filter used in qualitative analytical techniques to determine and identify materials. For use in büchner funnels.

Prepleated qualitative filters are also available, which give improved flow rate and increased loading capacity compared to equivalent flat filters.

Grade 3: 6 µm

Double the thickness of Grade 1 with still finer particle retention and excellent loading capacity; more precipitate can be held without clogging. The extra thickness gives increased wet strength and makes this grade highly suitable for use in Büchner funnels. The high absorbency is particularly valuable when the paper is used as a sample carrier. This filter is also available in the FilterCup. This is a convenient, disposable 70 mm filter funnel with a 250 ml capacity molded from polypropylene with an integral, heat bonded filter (catalog number 1600-003).


Compare similar models

Whatman No. 3 Filter Circles 7cm/100

Manufacturer P/N

1003-070

Part Number

ARLF-WH/MA/AO/1003070

Manufacturer

Cytiva Whatman

paper size

7cm

Whatman No. 3 Filter Circles 9cm/100

Manufacturer P/N

1003-090

Part Number

ARLF-WH/MA/AO/1003090

Manufacturer

Cytiva Whatman

paper size

9cm

Whatman No. 3 Filter Circles 15cm/100

Manufacturer P/N

1003-150

Part Number

ARLF-WH/MA/AO/1003150

Manufacturer

Cytiva Whatman

paper size

15cm

Insights

Explore
Cleaning Lab Glassware: Removing Stubborn Residue

7 mins read

Cleaning Lab Glassware: Removing Stubborn Residue

Cleaning laboratory glassware properly is essential for accurate, safe, and repeatable lab work. This guide explains how to remove stubborn residue from beakers, flasks, bottles, volumetric glassware, and other lab glassware, including grease, dried salts, biological residue, stains, and burnt deposits. It also covers safe cleaning methods, common mistakes, drying and storage tips, and when damaged glassware should be replaced.

Read full story
How to Calibrate Your Pipettes to ISO 8655 Standards

7 mins read

How to Calibrate Your Pipettes to ISO 8655 Standards

Pipette calibration helps laboratories confirm that liquid handling results remain accurate, repeatable, and traceable. This guide explains how pipettes are calibrated to ISO 8655 standards, including gravimetric testing, environmental control, correct tip selection, volume testing, calibration records, and common mistakes to avoid. It also covers when to use in-house calibration and when an external calibration service may be more suitable.

Read full story
Molarity and Dilution Calculator

9 mins read

Molarity and Dilution Calculator

A free molarity and dilution calculator covering four essential lab calculations: C1V1=C2V2 dilution (solve for any unknown), molarity from mass, mass from molarity, and serial dilution table generation. Includes worked examples, a concentration units guide and step-by-step preparation instructions for every result.

Read full story
Buffer Preparation Calculator

9 mins read

Buffer Preparation Calculator

Free online buffer preparation calculator. Select your buffer system, enter target pH, concentration and volume, and get an exact lab-ready recipe with reagent masses and step-by-step instructions. Covers PBS, Tris-HCl, sodium phosphate, acetate, HEPES, MOPS and more.

Read full story