PTP Program

Insulating Fluid Quality

2024 Annual Fee:

Schedule: March, September
Sample amount distributed each test cycle: 0.5 gallons

Reduced Price

Register for Multiple Programs
A2LA Accredited Symbol

Accredited Proficiency Testing Provider*

This program is accredited in accordance with the recognized International Standard ISO/IEC 17043: 2010 Conformity Assessment - General Requirements for Proficiency Testing, by the American Association for Laboratory Accreditation. Certificate Number: 4209.01

List of Programs and Scopes

About The Program

ASTM International Proficiency Testing Center is pleased to offer a Proficiency Testing Program on Insulating Fluid Quality Testing to laboratories who need a statistical quality assurance tool that will enable them to improve, and maintain a high level of performance in conducting routine ASTM tests on insulating fluid oils by comparing their results with other laboratories worldwide.

Samples, test instructions and data report forms are distributed electronically to each participant on the date samples are distributed. Labs have approximately 8 weeks to submit test data with the final statistical summary reports being electronically distributed in approximately 25 days.

Upon completion of tests, each laboratory returns their test data to ASTM for use in generating statistical summary reports. Reports contain:

  • Coded laboratory test results
  • Statistical analyses of test data
  • Charts plotting test results versus laboratory code
  • Other Information

For more information, contact us.

Why Should Your Laboratory Participate?

You will receive test results, available only to participating laboratories that will help you:

  • Monitor strengths and weaknesses of your laboratory's performance
  • Periodically compare your test results and calculated statistical parameters with other laboratories

Should you have an issue with your published results, please write to with your lab number and account number.

NOTE: Participation is not contingent upon performing all program test.

Test Materials

Each participating lab will receive a ½ gallon can containing either an In-Service Mineral Insulating Fluid sample or a New Mineral Insulating Fluid sample for one of the two test cycles conducted during the year.

Test Parameters


Flash Point

D664, D974, IEC 62021-1, IEC 62021-2

Acid Number


Aniline Point



D1298, D4052


D877, D1816


IEC 60156

Dielectric Breakdown


Flash Point

D5837, IEC 61198



Interfacial Tension

D2668, D4768, IEC 60666-B

Oxidation Inhibitor


Oxidation Stability


Particle Count


Power Factor (25ºC and 100ºC)

D97, D5950, D6749

Pour Point

D1169, IEC 60247



Sulfur Corrosive


Trace Metals


Viscosity, Kinematic @ 40ºC

D1533, D6304, IEC 60814

Water Content

D7042, ISO 3104


Viscosity, Kinematic

ISO 12185


NOTE: List of Methods Subject to Change.

Distribution Of Samples

Test samples are prepared and distributed for ASTM International by Clark Lab in Jefferson Hills, PA. Program registration fees include the cost of shipping test samples to U.S. participants or, for international participants, to a third party shipping agent located in the U.S.

IMPORTANT for Intercontinental participants: You have the following options for receipt of samples:

  • Ship through a third party shipping agent - provide ASTM International with the complete contact information of a designated Shipping Agent located in the U.S. who will be responsible for shipping samples from the U.S. to your facility. Participants are responsible for making financial and shipping arrangements directly with the shipping agent.
    • Please be advised that when samples are shipped, an e-mail is sent only to the contact of record on your ASTM PTP account. It is the customer’s responsibility to advise their designated shipper that the sample has been shipped.
    • We cannot permit shipping agents to pick up samples at our distributors’ warehouses.
  • Ship directly from the sample distributor via UPS, DHL, or FEDEX - Provide ASTM International with your shipping account number to cover shipping charges. Check that your carrier will deliver the test materials to your location. Materials classified as Hazardous may have restrictions.
  • Product Shipment Specs
    Quantity: 0.5 gallon
    Shipping Weight: 10 lbs
    Dimensions: 8x8x11"
    ECCN: EAR99
    Harm Code: 2710.19.4545
  • Generic SDS

Program Requirements

Participation is on an annual fee basis and open to all laboratories. Registration fees must be paid in advance to participate. Testing must be performed within the participant's laboratory facilities. A laboratory does not need to perform all the program tests to participate.

About Astm Committee D27

Committee D27 on Electrical Insulating Liquids and Gases has 92 members and over 66 published ASTM standards. This committee provides the technical direction for the PTP program. Test information generated through the program is utilized by Committee D27 to determine if modifications to ASTM standard tests are warranted. Data submitted to Committee D27 from the ASTM-PTP are coded to maintain lab confidentiality.