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Home > Sealants and Caulks > Silicones > PSI-641
PSI-641 Low Modulus Silicone Sealant
PSI-641 is a neutral-cure RTV sealant with exceptional extension/compression recovery characteristics, making it the silicone of choice for dynamic movement. Upon curing it forms a durable, flexible, watertight bond virtually unaffected by long-term exposure to rain, snow, sleet, ice, sunlight, ultraviolet radiation and atmospheric pollution.
PSI-641 has excellent primerless adhesion to most common materials, including concrete, masonry, glass, many metals, wood, ceramic and most plastics. It is not intended for structural applications
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Highly flexible over a wide range of temperatures. |
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UV and ozone-resistant. |
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Excellent weatherability and durability. |
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Non-corrosive. |
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Accommodates joint movement of ±50%. |
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All-temperature gunnability with long tooling time. |
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Meets Federal Specs TT-S-001543A and TT-S-00230C, ASTM C920-95, CAN/CGSB 19.13-M87. (see data sheet for details). |
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| Typical applications: |
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Seal expansion and control joints. |
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Caulk door and window frame perimeters. |
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Conventional glazing of glass, metal and plastic panels and frames. |
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Construction joints, including curtain wall and mullion joints, especially those subject to severe dynamic movement. |
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