Review of the January 13-15, 2013 Meeting of ASTM C24 on Building Seals and Sealants

Posted on 1/30/2013 10:13:28 AM By Bob Braun

I am reporting on the results of the activities that took place recently in Ft Lauderdale, Florida at the three day semi-annual meeting of ASTM C24.  C24’s current scope includes sealants, aerosol foam sealants, caulking compounds, elastomeric sealants, glazing compounds, preformed sealing tapes, and preformed gaskets.

ASTM C24 meets twice a year in January and June, with about 50 or more members attending three days of technical meetings. This meeting had the largest attendance I have seen in many years for a non-committee week meeting.  The ASTM meeting schedule provides for one committee-exclusive meeting, like this recent one, and then approximately six months later a combined meeting with approximately twelve different committees meeting in the same or nearby hotels.  The latter venue permits attendees to attend additional meetings in related disciplines to their own specialty.  This can be a big advantage, but for a new member it may be also very overwhelming.  Thus I recommend that if you are just joining ASTM, initiate your activities at the exclusive meeting for the committee whenever possible.  For ASTM C24 this has been and likely will continue to be a January meeting in Ft Lauderdale.  Next year’s dates are January 26-28, 2014.  The next C24 Committee week meeting will occur June 9-11, 2013 in Indianapolis.  You can find details for the next meeting at this link: and follow the Meetings &/Symposia link to ASTM Committee C24.

Here are some of the Ft Lauderdale meeting highlights:

  • Executive Committee
  • A complete update of the membership status, ballots requiring updates, and future meetings was reviewed and discussed.  In addition, the ASTM Committee on Technical Committee Operations (COTCO) has proposed the following revisions to the ASTM Regulations for consideration by all ASTM technical committees prior to submission to the Board of Directors for approval.  The C24 Executive Committee approved the underlined changes show below.

    7.3 Trade Associations:
    7.3.1 A trade association consisting of a single organization shall be considered the same classification and voting interest as that organization.
    7.3.2 A trade association for multiple organizations of exclusively the same classification shall be classified in accordance with those organizations’ principal business activities.

    These above changes are intended to keep each ASTM member producer limited to one vote which has always been the ASTM intent as well.

  • Research and Liaison Session (R&L): Sustainability
  • This R&L activity was largely facilitated and influenced through the networking and encouragement of the Adhesives and Sealants Council (ASC).  The one and a half hour meeting was very well attended and lead to very significant actions for the committee.  ASTM Vice President Tim Brooke presented the details of the new ASTM program that is designed to help companies develop Product Category Rules (PCRs), Environmental Product Disclosures (EPDs), and Life Cycle Assessments (LCAs).  On October 9, 2012 ASTM issued this news release: “ASTM Launches a New Initiative to Address the Environmental Impacts of Products”.  This initiated ASTM’s competition into the emerging area of program operators for EPDs. The program’s main elements require that interested ASTM committees ask ASTM as the formally recognized “Program Operator” to establish the technical advisory committee for the product area.  The C24 presentation by Tim Brooke included a PowerPoint presentation which will be posted soon at  for interested companies; however, for now one can view the general program details at

    The program’s main elements require that interested ASTM committees ask ASTM as the formally recognized “Program Operator” to establish the technical advisory committee for the product area.  ASTM C24 members have formally made this request effective this meeting. This committee will then establish the product category rules (PCRs).  The PCRs will then be developed through the technical advisory committee using a consultative process to achieve consensus.  To this point there is no ASTM fee as the program operator.  In addition, a panel consisting of at least three independent experts must review and verify the PCR for conformance with the ISO 14040 series of standards and insure that the LCA-based data provides an accurate description of the significant environmental aspects of the product. In order to promote harmonization, existing PCRs should be used and adapted prior to the development of a new PCR.  Here is the summary for the four step process:

    Step 1: Develop the PCR under the administration of the program operator, ASTM

    Step 2: Conduct the LCA which must gather the necessary data in order to compile the environmental impact

    Step 3: Develop the EPD with the manufacturer using the PCR to compile the life cycle assessment 

    Step 4: Verify the EPD through the program operator 

  • Terminology
  • The results of two Main ballot definitions were reviewed, “sealant backing” and “standard conditions”.  Under old business, the Adhesives and Sealants Council (ASC) had requested C24 create new terms related to sustainability.  It was recommended the ASTM E60 sustainability terms be adopted.  Under new business, new language was proposed and will be balloted for “weatherability”.

  • International Standards
  • A full report was provided on the most recent meeting in Japan, Tokyo.  In addition, future meetings were discussed and the active members were reviewed.  New and interested companies can join as well.

    • Standards Due for Review and/or Action – Standards 5 years or older that require review and ballot action in near future.  The standards listed below are currently not on a ballot.  In each case actions are needed soon by the sponsoring subcommittees to reballot these standards as-is or review, modify and reballot before the deadline.

    C24.10 C24.20 C24.30 C24.40 C24.61 C24.73
    C1330-02(2007)* C603-04(2008) C1635-06 None C1642-07


    C1369-07 C792-04(2008) C1216-03(2008)      
    C1021-08 C1016-02(2008) C1183-04(2008)*      


    C24.10  Specifications, Guides, and Practices
    C24.20  General Sealants
    C24.30  Adhesion
    C24.40  Weathering
    C24.61  Aerosol Foam Sealants
    C24.73  Compression Seal and Lock Strip Gaskets

    * Slated for next Main Ballot (In queue)

    Note:  2005 standards will be withdrawn at end of year if no action is taken

  • Weathering
  • New Task group was formed to study more extreme accelerated weathering exposure.

  • Aerosol Foam Sealant
  • The ASTM C24.61 Subcommittee reviewed the results for their first ILS to evaluate the precision and bias for ASTM C1536 on aerosol foam sealant yield.  This has been a long sought effort by the foam sealants industry and required seven test labs testing several different products to achieve a result.  Kudos to the group.  A final report is being prepared. 

    Also, largely facilitated to this stage through ASC networking and encouragement, this subcommittee moved one step closer to finalizing a program that will develop short video presentations for nearly all test methods utilized by this industry.  They have now laid out the plan details seeking participation from the appropriate testing labs. The hope is to imbed these video links in a future ASTM Standard Guide for Product Selection…for Aerosol Foam Sealants… This guide is currently underway as WK 36918 which can be viewed at the ASTM C24 web.  Finally two test method drafts were submitted for review: one for tensile adhesion and one for measuring flow rate. 

In Blog #21, I will return to the subject of building wall issues and the developing practices designed to reduce wall deterioration and failure due to water and air infiltration.

Any Questions…let me know…

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