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AAMA Updates Document Addressing Sealants

AAMA 800-07, a voluntary specification covering test methods for sealants, has been released by the American Architectural Manufacturers Association (AAMA). According to Ken Brenden, AAMA technical standards manager, the revamped 30-page document, first published in 1992 and titled Voluntary Specifications and Test Methods for Sealants, includes several updates.

This specification is a compilation of standards and test methods for determining the performance of both compounds and tapes used in the manufacture and/or installation of windows, sliding glass doors and curtainwalls. Sealant specifications in this publication include back-bedding compounds, back-bedding mastic tapes, glazing tapes, narrow joint seam sealers, exterior perimeter sealing compounds, non-drying sealants and expanded cellular glazing tapes.

“In addition to various editorial changes, the most significant change was the addition of sections for performance requirements covering slump and extension/compression and a section on the test method for hardness evaluation,” says Brenden.

A note was added regarding testing of Group A and C compounds and offered a choice of test methods.

Part of this testing may provide insight on sealant durability and performance. A second note explains how the specimen requirements were derived for lap shear strength with exposure. This value was increased to be consistent with uniform structural load test requirements of AAMA/WDMA/CSA 101/I.S. 2/A440.

A third note also was added to caution the user that it is required to determine chemical compatibility to the substrates in the application, as sealants used in the installation of fenestration products can adversely affect the substrates and other compounds used. New figures were also added to demonstrate lap shear preparation and testing.

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