A Review of the Recent ASTM C24 Sealant Committee Meeting in Ft Lauderdale January 26-28, 2014

Posted on 2/4/2014 9:54:38 AM By Bob Braun

In my last post, I reviewed how the concept of sustainability has been expanding.  In this post, I leave the sustainability focus in order to review the activities at the January 26-28 ASTM C24 meeting in Ft Lauderdale.

First, let’s look at the overall schedules for the ten subcommittees that comprise ASTM C24...At the Ft Lauderdale meeting, nine of the subcommittees met to work on creating new standards and revise existing standards.  I have listed these here:

C24.01  Terminology

C24.03  Citations

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

C24.87  International Standards

In addition, there was a Sunday meeting of C24.90 (the Executive Committee), a closing Main Committee meeting on Tuesday at 3 PM, and the C24 Research & Liaison (R&L) Session at 4PM, including a session reviewing the GreenScreen Program used to access the hazard potential of chemicals used in product formulations.  In addition, Ujjual Vyas of the Alberti Group presented information around the legal implications and economic pitfalls when individuals, associations, or companies use the “Precautionary Principle” that is associated with various chemical green screening methods.

I am focusing on the agendas for two of the larger subcommittees in C24: “Terminology” and “ISO Standards” and will also highlight a few major items for the Foam Sealants Subcommittee, which I chair.

The Terminology Sub is responsible for defining and re-defining as necessary the many terms used by the ten subcommittees.  This Sub has a total membership of 59 and has 47 official voting members.  C24 established a rule several years ago that if a definition for a term existed in the C24 Terminology Std C717, then it must not be redefined in another C24 Std.  This is an attempt to both standardize the same term throughout the ten C24 Subs and to reduce the length of new and existing standards.  At the same time, this standardization of terms is most important to architects, designers, and specifiers that use the C24 Standards.  Not confusing this audience with multiple definitions is extremely important to sealant manufacturers.  At this meeting the ballot results for “sealant backing,”  'weatherability,” and “adhesive failure” were discussed and reviewed at length.  You will be able to review the full details here.

The General Sealants Subcommittee is by far the largest in C24 with 103 total members and 75 official voting members.  Here is the list of ballot items that were discussed and reviewed:

  1. Revision of ASTM C0603 Extrusion Rate and Application Life of Elastomeric Sealants
  2. Revision of ASTM C0681Test Method for Volatility of Oil and Resin-Based, Knife Grade Channel Glazing Compounds
  3. Revision of ASTM C0771 Test Method for Weight Loss After Heat Aging of Preformed Tape Sealants
  4. RAPPROVAL of ASTM C0879 Test Methods for Release Papers Used with Preformed Tape Sealants
  5. Revision of ASTM C1016 Test Method for Determination of Water Absorption of Sealant Backing (Joint Filler) Material
  6. Revision of ASTM C1241 Test Method for Volume Shrinkage of Latex Sealants During Cure
  7. Revision of ASTM C1253 Test Method for Determining the Outgassing Potential of Sealant Backing
  8. Revision of ASTM D2377 Test Method for Tack-Free Time of Caulking Compounds and Sealants
  9. Revision of ASTM C1681 Test method for Evaluating the Tear Resistance of a Sealant Under Constant Strain

There were several issues that needed to be resolved at the meeting for several of the above standards.  The negatives were first voted persuasive or non-persuasive at the Subcommittee level and then reviewed again at the closing of the main meeting.  If any of these issues are of sufficient interest to you, your future participation can help improve the quality of the C24 standards.  Consider membership.  This will give you an official vote in resolving future standards issues and you can also apply for membership in specific subcommittees.

Finally, I want to note that Sub C24.61 for Foam Sealants has just completed the ASTM staff review for their ILS (inter-laboratory study) for foam sealant yield C1536.  The precision and bias statement has been generated and balloted at the sub-level with one issue.  The issue was persuasive and agreement was reached after a conference call to the ILS staff.    It’s also important to note that C1642 for determining air leakage rate received three negative votes at the Main Committee level.  Two votes were voted persuasive and technical and one non-persuasive.  Thus, this standard will need a second main ballot to incorporate the technical changes. 

Finally, Draft 8 of the Standard Guide for Product Selection/Delivery Systems for Aerosol Foam Sealants and Adhesives (WK 36918) was reviewed. The Task Group (TG) had previously reviewed draft 7 and provided feedback. More work is needed on this draft and an action item to provide draft #9b is in process. Many new pictographs have been imbedded in draft 8, but more are still desired to cover the commercial building applications better.

In my next post, I will discuss the new challenges for the sealant and adhesive formulator Part 1.

Any Questions?  Please let me know.  Also, feel free to reach out if you’d like to attend the next meeting.

Anything you'd like to see in the future on a B&C topic? 

Post a comment below and I'll respond.

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