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  • Paints & Coatings

BS3900 (1971) Viscosity Flow Cup

  • 2.38mm – 7.14mm orifice diameter
  • 38 – 1650 cSt viscosity range
  • Flow times 300-300 sec
  • Supplied with a certificate of conformity
  • Sheen 401/2, 401/3, 401/4, 401/5 & 401/6 equivalent

£102

All GBP prices are exclusive of UK VAT (where applicable)

Viscosity Flow Cups

The Rhopoint Flow Cups are designed to accurately measure the viscosity of paints, inks, varnishes and similar products.

What is viscosity?

The term “viscosity” is a parameter that describes a fluids resistance to flow. This resistance is a measure of the friction and the forces of interaction between the layers of a fluid. This friction is apparent when one layer of fluid is made to move against another The greater the friction, the greater the amount of force required to cause the movement – known as “shear”.


The process of flow through an orifice can often be used as a relative measurement and classification of viscosity. This measured kinematic viscosity is generally expressed in seconds of flow time which can be converted into centistokes (cSt) using a viscosity calculator.

Flow cup cross section diagram

Manufactured from high grade aluminium alloy with stainless steel orifices (where indicated), the Rhopoint Flow Cups are available with a range of UKAS / ISO 17025 certified standard oils to confirm the flow cup is measuring within specification.

Paint pouring into a paint can - Flow cup measurement
Paint
Varnish being brushed onto wood - Flow cup measurement
Paint
Printing ink being tested for viscosity - Flow cup measurement
Paint

Specification

Instrument Information
MaterialHigh grade aluminium alloy, stainless steel orifice
Commodity Code9027 8091
Weight200 - 300g (depending on model)
,
ProductOrder codeOrifice diameterViscosity rangeFlow times
BS flow cup B2: 2.38mm (0.09”)RL-A-FC-PTA6/B22.38mm (0.09”)38 - 71cSt30s - 300s
BS flow cup B3: 3.17mm (0.12”)RL-A-FC-PTA6/B33.17mm (0.12”)38 - 147cSt30s - 300s
BS flow cup B4: 3.97mm (0.16”)RL-A-FC-PTA6/B43.97mm (0.16”)71 - 455cSt30s - 300s
BS flow cup B5: 4.76mm (0.19”)RL-A-FC-PTA6/B54.76mm (0.19”)299 - 781cSt30s - 300s
BS flow cup B6: 7.14mm (0.28”)RL-A-FC-PTA6/B67.14mm (0.28”)781 - 1650cSt30s - 300s

Downloads

Datasheets & Manuals

Application Notes & White Papers

Answers to common questions about our instruments and measurements

Why measure gloss?

Gloss is an aspect of the visual perception of objects that is as important as colour when considering the psychological impact of products on a

Read More »

What is RSpec?

RSpec is the peak reflectance measured over a very narrow angular band in the specular direction (+/-) 0.0991º. RSpec is very sensitive to any texture

Read More »

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BS3900 (1971) Viscosity Flow Cup

£102