PRA has been supplying calibrated viscosity oils to industry for over 50 years.

  • Each oil comes with a calibration certificate giving viscosity measurements at 20, 23 and 25°C.
  • The oil is produced in a laboratory accredited to ISO 17025 and ISO Guide 34 using primary laboratory test equipment giving improved levels of uncertainty.
  • Calculated viscosity at temperatures at 0.5°C intervals between 20 and 25°C and a calibration graph are included on the certificate.

Viscosity Products

500ml Oil bottles

Ideal for calibrating equipment or flow cups at any temperature between 20 and 25°C.The certificate supplied with each oil can include the flow time of the oil through a specified flow cup at temperatures from 20 to 25°C in 0.5°C steps.

Each Viscosity Calibration Standard Oil is supplied in a 500 ml container together with a certificate showing that the calibration is traceable to the International Standard ASTM D2162. The calibration certificate quotes viscosity in mm²/s (centistokes), mPa.s (centipoise) and (where applicable) Krebs units.

If you require any further information please contact us.

visc oil full bottle new

Calculation of Flow Time

We can also calculate the flow time of the oil through a specified flow cup at 0.5°C intervals between 20 and 25°C. This chart is purchased separately. Please contact us and specify which oil and flow cup the chart is required for.

Pricing & Delivery

Viscosity Oils Price Summary
(see also Delivery Charges)PRA MembersNon members
Calibration Oils500ml Oil Pack£107.99£123.99
Flow Cup Time calculation£12.00£14.00

Delivery Charges

Delivery Charges are based on the destination and the number of items ordered.

Delivery charges are not made for flow time calculations.

Delivery Charges by Destination

Europe 1£42
Europe 2£48
Europe 3£48
Europe 4£54
Europe 5£60
All Other Destinations£POA

Europe 1 Destinations are:

  • Belgium
  • Ireland
  • Luxembourg
  • Netherlands

Europe 2 Destinations are:

  • France
  • Germany
  • Monaco
  • Jersey
  • Guernsey

Europe 3 Destinations are:

  • Austria
  • Denmark
  • Finland
  • Italy
  • Portugal
  • Spain
  • Sweden

Europe 4 Destinations are:

  • Bulgaria
  • Andorra
  • Cyprus
  • Croatia
  • Czech Republic
  • Estonia
  • Greece
  • Hungary
  • Latvia
  • Lithuania
  • Poland
  • Romania
  • Slovakia
  • Slovenia

Europe 5 Destinations are:

  • Gibraltar
  • Liechtenstein
  • Norway
  • Switzerland
Oil No.Previously supplied asDynamic Viscosity mPa.s (cP) at 25°CKinematic Viscosity mm²/s (cSt) at 25°CViscosity (Krebs Units) at 25°CDensity g/cm³ at 25°CSafety Data Sheet
U01004121.0524.88-0.8459U0100 SDS
U02001, 2155.7065.30-0.8530U0200 SDS
U04002, 2275.0587.81-0.8547U0400 SDS
U06003, 23101.10117.70-0.8590U0600 SDS
U08004, 24152.00176.00-0.8637U0800 SDS
U10005, 25203.10235.10-0.8637U1000 SDS
U12006, 26252.10290.80540.8670U1200 SDS
U14007, 27302.40348.50580.8677U1400 SDS
U16008, 28352.60405.90610.8686U1600 SDS
U18009, 29391.30451.30620.8671U1800 SDS
U200010, 30498.40573.30680.8693U2000 SDS
U220011, 31704.50809.40760.8704U2200 SDS
U240012, 321001.001148.00860.8722U2400 SDS
U260013, 331498.001713.00980.8742U2600 SDS
U280014, 342646.003014.001170.8778U2800 SDS
U300015, 354010.004562.001330.8790U3000 SDS
U310015A5927.006729.00-0.8808U3100 SDS
U3200166011.006818.00-0.8816U3200 SDS
U3400178128.009182.00-0.8852U3400 SDS
U3600189683.0010950.00-0.8843U3600 SDS
U38001915101.0017025.00-0.8870U3800 SDS
U40002020224.0022780.00-0.8878U4000 SDS