ISO viscosity cup BS3900 (1971)

aluminumstainless steelcertificated

Short description

• 2.38mm – 7.14mm orifice diameter
• 38 – 1650 cSt viscosity range
• Flow times 30s - 300s
• Supplied with a certificate of conformity
• Sheen 401/2, 401/3, 401/4, 401/5 & 401/6 equivalent

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

What is viscosity?
The term “viscosity” describes a fluid's resistance to flow. This resistance is a measure of the friction and the forces of interaction between the layers of a fluid. The greater the friction, the greater the force required to cause movement (shear). The process of flow through an orifice can be used as a relative measurement and classification of viscosity. The measured kinematic viscosity is generally expressed in seconds of flow time which can be converted into centistokes (cSt) using a viscosity calculator.

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

Available models
Product | Order code | Orifice diameter | Viscosity range | Flow times
B2: 2.38mm (0.09”) | RL-A-FC-PTA6/B2 | 2.38mm (0.09”) | 38 - 71 cSt | 30s - 300s
B3: 3.17mm (0.12”) | RL-A-FC-PTA6/B3 | 3.17mm (0.12”) | 38 - 147 cSt | 30s - 300s
B4: 3.97mm (0.16”) | RL-A-FC-PTA6/B4 | 3.97mm (0.16”) | 71 - 455 cSt | 30s - 300s
B5: 4.76mm (0.19”) | RL-A-FC-PTA6/B5 | 4.76mm (0.19”) | 299 - 781 cSt | 30s - 300s
B6: 7.14mm (0.28”) | RL-A-FC-PTA6/B6 | 7.14mm (0.28”) | 781 - 1650 cSt | 30s - 300s

Downloads
Datasheet: Viscosity Flow Cups Datasheet (English)

Technical characteristics / specifications

• Material: High grade aluminium alloy, stainless steel orifice
• Commodity Code: 9027 8091
• Weight: approx. 200 - 300 g (depending on model)
• Orifice diameters (models): B2 2.38 mm; B3 3.17 mm; B4 3.97 mm; B5 4.76 mm; B6 7.14 mm
• Viscosity measurement ranges by model: B2 38–71 cSt; B3 38–147 cSt; B4 71–455 cSt; B5 299–781 cSt; B6 781–1650 cSt
• Flow time measurement window: typically 30 s – 300 s
• Supplied with certificate of conformity
• Sheen equivalents: Sheen 401/2, 401/3, 401/4, 401/5 & 401/6