Falling Number Test Tube

Replacement Glass viscometer tube for Falling Number grain testing

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Standard-Dimension Falling Number Test Tube (Glass Viscometer Tube) – 21 × 221 mm, 75 mL

The Cambridge Environmental Falling Number test tube (glass viscometer tube) is built to the standard dimensions used in Falling Number (Hagberg–Perten) grain and flour testing. It’s a reliable replacement option for labs that need consistent fit and repeatable handling.

Specifications: 21 × 221 mm • 75 mL

Standards and dimensional compliance

Our viscometer tubes are manufactured to meet the dimensional requirements referenced in widely used Falling Number methods:

AACC International Method 56-81B – dimensional/tolerance requirements for Falling Number testing
ICC Standard No. 107/1 – dimensional guidance for alpha-amylase activity measurement
ISO 3093 – dimensional requirements for the Hagberg–Perten method

Specification	Detail
Material	Borosilicate glass
Tube size	21 × 221 mm
Capacity	75 mL
Application	Falling Number (Hagberg–Perten) testing

Compatibility

Compatible with Falling Number instruments that use the standard 21 × 221 mm glass tube format and matching holder/stirrer geometry, including: Perten 1700, Bastak 5000/5100, FOSS Alphatec, and other standard-tube FN systems. Confirm dimensions/holder style before ordering if unsure.

Frequently Asked Questions

Will this Falling Number tube fit my instrument?

If your unit uses the standard 21 × 221 mm (75 mL) glass tube format and a typical FN tube holder/stirrer setup, it should fit. If you’re unsure, compare to your current tube or request a sample.

Which instruments is it compatible with?

Known examples include Perten Model 1700, Bastak Model 5000/5100, and FOSS Alphatec, plus other systems that use the same 21 × 221 mm standard tube format.

What are the exact specifications?

Glass tube, 21 × 221 mm, 75 mL capacity.

What does the Falling Number value indicate?

It reports the seconds required for the stirrer to fall through the heated slurry. In general, a higher Falling Number (longer time) indicates higher viscosity and lower enzyme activity.

Can you help verify fit before we switch suppliers?

Yes. We can provide a sample tube for fit verification so you can confirm compatibility and evaluate cost savings before changing over.