What Is HT39 Viscosity Standard? HTHS Testing And ASTM D5481 Guide
HT39 is a high-temperature viscosity calibration fluid used for viscometer calibration and verification under High-Temperature High-Shear testing conditions.
It is commonly used by laboratories working with engine oils, lubricants and petrochemical samples where reliable viscosity performance at 150 °C is critical.
HT39 At A Glance
High-Temperature Standard
HT39 is used as a viscosity standard for high-temperature testing and viscometer verification.
HTHS Testing
It supports High-Temperature High-Shear workflows for engine oils and lubricants.
150 °C Use
HT39 is commonly associated with viscosity testing at 150 °C under ASTM D5481 workflows.
500 mL And 1 L
Available through John Morris Group in both 500 mL and 1 L bottle sizes.
What Is HT39 Viscosity Standard?
HT39 is a Cannon Instruments viscosity standard designed for high-temperature viscosity testing and viscometer verification. It is used by laboratories that need reliable measurements under demanding high-temperature and high-shear conditions.
Viscosity standards are used to check that an instrument is performing correctly. HT39 is supplied with lot-specific viscosity data, helping laboratories support traceability, repeatability and confidence in their viscosity results.
For laboratories testing engine oils, lubricants and petrochemical products, selecting the right viscosity standard is an important part of maintaining dependable quality control results.
Commonly Used For
- •High-temperature viscosity calibration
- •High-Temperature High-Shear testing
- •ASTM D5481 related workflows
- •Engine oil and lubricant quality control
- •Viscometer verification at elevated temperature
For a broader explanation of calibration fluids, certified values and method selection, read our guide to viscosity standards and viscometer calibration.
What Does HTHS Mean?
HTHS stands for High-Temperature High-Shear. It refers to measuring the viscosity of a fluid while it is exposed to both elevated temperature and high shear conditions.
This is important because oils and lubricants can behave differently under operating stress. A lubricant may have one viscosity at room temperature, then behave differently when exposed to heat, movement and mechanical load.
HTHS testing helps laboratories assess how a lubricant performs under more demanding conditions, making it valuable for engine oil testing, formulation work, product quality control and petrochemical laboratory workflows. For a broader overview, read our guide on what viscosity is and how to measure it in the lab.
Why Is HT39 Used At 150 °C?
HT39 is closely associated with HTHS testing at 150 °C, a temperature used in ASTM D5481 workflows for engine oil viscosity testing.
At elevated temperatures, lubricant viscosity can change significantly. If an oil becomes too thin, it may not provide the required protection. If it is too viscous, it may affect flow, efficiency and performance.
Using a viscosity standard such as HT39 helps laboratories verify that their viscometer is performing reliably under these demanding high-temperature conditions.
HT39 500 mL Vs 1 L: Which Size Should You Choose?
HT39 is available in 500 mL and 1 L bottle sizes. The best choice depends on how often your laboratory performs HTHS testing, how frequently the standard is used and the volume required for your internal quality control process.
| Option | Best Suited For | Key Benefit | Product Link |
|---|---|---|---|
| HT39, 500 mL | Lower-volume testing, occasional verification, smaller laboratory workflows or controlled use | Practical size for laboratories that need HT39 but do not require a larger bottle | View 500 mL Product |
| HT39, 1 L | Routine testing, higher-frequency calibration, busy QC laboratories or larger petroleum testing workflows | Larger volume for laboratories that use HT39 more regularly | View 1 L Product |
Choose the 500 mL bottle if your laboratory performs occasional HTHS verification or prefers smaller-volume use. Choose the 1 L bottle if your laboratory performs frequent viscosity checks or needs a larger supply for repeated calibration and verification routines.
How HT39 Supports ASTM D5481 Testing
ASTM D5481 is a test method used for measuring apparent viscosity at high temperature and high shear rate using a multicell capillary viscometer. It is commonly connected with engine oil testing at 150 °C.
HT39 supports this type of testing by providing a known reference material for viscometer calibration and verification. Checking instrument performance against a suitable viscosity standard helps laboratories improve confidence that the test system is operating correctly.
A viscosity standard does not replace the test method, but it helps laboratories maintain consistency, traceability and confidence in the measurement process.
Common Applications For HT39 Viscosity Standard
Explore More Viscosity Testing Resources
HT39 is one part of a broader viscosity testing workflow. Laboratories may also need to understand viscosity measurement methods, select the right viscometer, or compare different Cannon Instruments viscosity standards for their application.
Viscosity Measurement Guide
Learn what viscosity means, how it is measured in the lab, and which methods suit different applications.
Read The Viscosity GuideCannon Instruments Range
Browse Cannon Instruments viscometers, viscosity standards and related petroleum testing solutions.
View Cannon InstrumentsOther Cannon Viscosity Standards
Compare related Cannon viscosity standards for different viscosity ranges and test methods.
View Cannon N2 StandardView Cannon N115B Standard
View Cannon N1000 Standard
HT39 Viscosity Standard FAQs
What Is HT39?
HT39 is a Cannon Instruments viscosity standard used for high-temperature viscosity testing and viscometer verification. It is designed for HTHS applications and is commonly used in lubricant, engine oil and petrochemical testing.
What Is HT39 Viscosity Standard Used For?
HT39 viscosity standard is used to support calibration and verification of viscometers under high-temperature and high-shear conditions. It helps laboratories check instrument performance and maintain confidence in viscosity measurements.
Is HT39 Used For HTHS Testing?
Yes. HT39 is used for High-Temperature High-Shear testing workflows, particularly where laboratories need a suitable viscosity standard for testing at 150 °C.
What Bottle Sizes Are Available?
John Morris Group offers Cannon Instruments HT39 viscosity standard in 500 mL and 1 L bottle sizes. The 500 mL option is suited to lower-volume use, while the 1 L option is suited to routine testing and higher-use laboratories.
Is HT39 Suitable For ASTM D5481?
HT39 is used to support ASTM D5481 related HTHS viscosity testing workflows. Laboratories should confirm their method requirements, instrument setup and internal quality procedures before selecting a viscosity standard.
Where Can I Buy Cannon HT39 In Australia?
Cannon Instruments HT39 viscosity standard is available from John Morris Group in Australia, with local quotation support, technical assistance and after-sales support.
Buy Cannon Instruments HT39 From John Morris Group
Cannon Instruments HT39 Viscosity Standard, 150 °C For HTHS, 500 mL
A practical size for laboratories performing lower-volume or occasional HTHS verification and high-temperature viscometer calibration.
View 500 mL ProductCannon Instruments HT39 Viscosity Standard, 1 L
A larger bottle size for routine testing, higher-frequency calibration and busy lubricant or petrochemical QC laboratories.
View 1 L ProductNeed Help Selecting An HT39 Viscosity Standard?
Talk to John Morris Group about Cannon Instruments HT39 viscosity standards for HTHS testing, ASTM D5481 workflows, lubricant quality control and high-temperature viscometer verification.
Contact UsCall 1300 501 555 or contact John Morris Group for quotation and technical support.
