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AQA 24-35 liquefied petroleum gas (autogas)

December 2024

This proficiency test is part of our 2024 proficiency testing (PT) program for gas mixtures. The study is covered by our accreditation as a PT provider (ISO 17043). 

Registrations close 1 October 2024.

Test materials

We’ll prepare and distribute each PT sample in a 0.5 L constant pressure cylinder (CPC).

Liquefied petroleum gas (LPG) samples will contain these components (nominal mole fractions only):

  • Propane: 60% to 80%
  • n-Butane: 15% to 25% 
  • iso-Butane: 15% to 25% 
  • Ethane: ≤ 2 % 
  • Pentane: ≤ 2 %. 

Reference values for the comparison are traceable to the SI (International System of Units) registered in the KCDB (Key Comparison Database).

Sample distribution and reporting


  • distribute samples by 1 December 2024
  • issue the PT report in March 2025.

Once you’ve completed the study you must do the following by 1 February 2025:

  • submit your measurement results
  • include a brief description of the test method
  • include an expanded measurement uncertainty estimate, if applicable
  • return the sample cylinders.


The cost to participate is $1,550 and includes:

  • goods and services tax (GST)
  • delivery to Australian sites. 

You must pay extra for:

  • return freight
  • all international freight and duty charges.

To apply

Read our proficiency terms and conditions. Then email with your:

  • contact name
  • phone
  • delivery address
  • organisation
  • ABN, if you’re an Australian participant.