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Stakeholders Sought to Determine Sealant Mildew Resistance

A task group of ASTM Subcommittee C24.20 on General Sealant Standards is drafting a standard test method to determine the mildew resistance of sealants.

“Building sealants are the front line of defense against air infiltration into homes and buildings,” says subcommittee member Morton Jones, director of R&D, Caulks and Adhesives, Gardner-Gibson, Largo, Fla. “Mold spores in the air will attack any surface where moisture and nutrients exist. Mold growth reduction in building structures is a significant human health concern. Sealant mold resistance claims should be appraised and validated.”

As the task group develops test procedures, it invites feedback from sealant producers on:

• What is the best test protocol(s) to evaluate a sealant’s mildew resistance?
• What classifications describe mold resistance?
• How long should a caulk or sealant prevent mildew growth under ideal conditions?
• What are the physical property changes to address?
• What is the effectiveness of sealant mold inhibitors that decline with exposure?

Jones says the consumer and sealant industry can benefit when the standard test method is applied, as it validates product performance and label claims of sealant mold-and-mildew resistance.

The group is part of ASTM Subcommittee C24.20, General Sealant Standards, in Committee C24 on Building Seals and Sealants, which develops standards for building-joint sealants.

To participate in this activity, contact Jones (phone: 727/531-4100). Committee C24 meets June 15-19 in Denver, Colo. For meeting or membership details, contact Scott Orthey, manager, Technical Committee Operations, ASTM International (phone: 610/832-9730). //

Copyright 2003, ASTM