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ASTM Sealant Standard tests new products for weather exposure.
Press Release Summary:
Nov 09, 2011 - ASTM C1735, Test Method for Measuring the Time Dependent Modulus of Sealants Using Stress Relaxation, will help sealant manufacturers to evaluate new products and changes to said products due to weather exposure. According to NIST research chemist and C24 member Christopher White Ph.D., this standard quantifies properties of interest that can be used to follow changes in sealant and may result in early detection and correction of problems."
Original Press Release
New ASTM Sealant Standard Tests New Products for Weather Exposure
Press release date: Nov 07, 2011
"Sealant is such an attractive and useful material for separating the inside from the outside in the building envelope because of its unique attributes such as elasticity, adhesion and barrier properties," says Christopher White, Ph.D., research chemist, National Institute of Standards and Technology, and a C24 member. "Changes to these properties indicate changes to the molecular structure that often precede failure. This standard, using commonly available laboratory equipment, allows manufacturers to directly measure the properties that are of real interest."
White notes that new sealant is often firm, soft and pliable and can be stretched without breaking while old sealant can be hard, cracked, brittle and sometimes almost like liquid.
"ASTM C1735 quantifies the properties of interest that can be used to follow those changes in the sealant, resulting in early detection and correction of problems to sealant properties," says White. "Previous to this standard, you had to rely on visual inspection of the sealant."
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View this release on the ASTM Web site at www.astmnewsroom.org.
ASTM Committee C24 Next Meeting: Jan. 8-10, 2012, Ft. Lauderdale, Fla. Technical Contact: Christopher C. White, Ph.D., National Institute of Standards and Technology, Gaithersburg, Md., Phone: 301-975-6016; email@example.com
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