ISO 2431 and ASTM D5125 Viscosity Flow Cup
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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.
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.
|Material||High grade aluminium alloy, stainless steel orifice|
|Commodity Code||9027 8091|
|Weight||200 - 300g (depending on model)|
|Product||Order code||Orifice diameter||Viscosity range||Flow times|
|Flow Cups to BS EN ISO 2431, ASTM D5125||RL-A-FC-ISO3||3mm (0.12”)||7 - 42cSt||30s - 100s|
|Flow Cups to BS EN ISO 2431, ASTM D5125||RL-A-FC-ISO4||4mm (0.16”)||35 - 135cSt||30s - 100s|
|Flow Cups to BS EN ISO 2431, ASTM D5125||RL-A-FC-ISO5||5mm (0.20”)||91 - 325cSt||30s - 100s|
|Flow Cups to BS EN ISO 2431, ASTM D5125||RL-A-FC-ISO7||6mm (0.24”)||188 - 684cSt||30s - 100s|
|Flow Cups to BS EN ISO 2431, ASTM D5125||RL-A-FC-ISO8||8mm (0.31”)||600 - 2000cSt||30s - 100s|
|The orifices are manufactured from stainless steel.|
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