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    Difficult Sealant Joints

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    Many premature sealant failures occur in joints which differ from the “archetype” -- the common parallel-sided, uniform, panel-to-panel expansion joint, with an hour-glass sealant profile. Parameters are discussed for obtaining good long-term performance from non-classical types of weatherseal joints. The conditions which are addressed include problems with substrate surface profile, intrinsic properties of substrates, joint shape, and dimensions. Also presented is a summary of the considerations in preventing premature sealant failure which are common to all types of exterior weatherseal joints.


    Sealant joint failure, substrate, fillet, dimension, surface profile

    Author Information:

    Nicastro, DH
    Senior Materials Engineer, Law Engineering, Inc., Houston, Texas

    Committee/Subcommittee: C24.80

    DOI: 10.1520/STP14882S