ASTM Water Activity in Whole Hemp Flower Proficiency Testing Program

    2022 Schedule: January, May and September

    Sample amount distributed each test cycle: Approximately 6 grams (3 samples x 2 grams)


    ASTM’s Water Activity in Whole Hemp Flower Proficiency Testing Program provides laboratories with a statistical quality assurance (SQA) tool, enabling them to compare, improve, and maintain, a high level of performance in the use of ASTM methods with other laboratories worldwide. The Water Activity in Whole Hemp Flower program will provide three different samples of whole hemp flower with varying levels of water activity in each sample per cycle.

    Conducted three times annually (1 cycle in 2020, the launch year), this program provides a different commercial sample, electronic report forms, and test instructions for each test cycle. Your laboratory performs the water activity by D8196 using the published ASTM standard practice cited in the program. All data and related information generated from the program is coded to maintain lab confidentiality.

    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 20 business days.


    ASTM's Proficiency Test Program provides you with:

    • A useful and meaningful statistical quality assurance tool to monitor the strengths and weaknesses of your laboratory's performance in conducting testing.
    • The resource you need to satisfy proficiency testing elements of laboratory accreditation.
    • A periodic comparison of test results with other participating laboratories.


    Each participating lab will receive three (3) whole hemp flower samples for each of the three test cycles (1 cycle in 2020) conducted during the year. The water activity levels will vary between samples and are controlled and maintained via Boveda precision humidity control.



    Water Activity

    NOTE: List of tests subject to change.


    Test samples are prepared and distributed for ASTM International by Boveda in Minnetonka, MN. Program registration fees include the cost of shipping the test samples to U.S. participants. At this time, due to the product used in this program, participation will be limited to laboratories located in the United States.

      • Please be advised that when samples are shipped, an e-mail is sent only to the contact of record on your ASTM PTP account.

      • We cannot permit participants to pick up samples at our distributors’ warehouses.

    • Shipping Specifications


    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. (All data and related information generated from the program is coded to maintain lab confidentiality.)


    Committee D37 on Cannabis was formed in 2017 to develop standards for cannabis, its products and processes. The activities are focused on meeting the needs of the cannabis industry addressing quality and safety through the development of voluntary consensus standards. Subcommittees will focus on the development of test methods, practices and guides for cultivation, quality assurance, laboratory considerations, packaging and security. D37 has 9 technical subcommittees to develop and maintain standards. The Committee, with a membership of approximately 900 from 26 countries, has its standards published in the Annual Book of ASTM Standards, Volume 15.10. Information on this subcommittee structure and D37's portfolio of approved standards and Work Items under construction are available from the ASTM website. Test information generated through the program is utilized by Committee D37 to determine if modifications to ASTM International methods or new methods are warranted and to analytically review program test results.

    For Additional Information Please Contact:

    John Gallagher - +1-610-832-9646