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  • IOTA 998 Silicone Weatherproofing Sealant

    IOTA 998 Silicone Weatherproofing Sealant

    1. weatherproofing joint seal for the curtain wall

    2. ±25% movement capacity

     

    PRODUCT FEATURES

    1.Excellent weatherability, virtually unaffected by sunlight, rain, snow and ozone 

    2.Neutral cure-suitable for use on metals, coated glass, aluminum panels, terracotta panels, concrete materials, galvanized steel and many other substrates.

    3.Extension/compression movement capability of up to ±25 percent of the original joint width

    4.Excellent resistance to temperature extremes, stable and flexible over the temperature range from –50 to +150 ℃

    5.Excellent unprimed adhesion to a wide variety of building materials  

    6. Easy of application-ready to use as supplied  

    7. Good compatibility with other neutral silicone sealants

     

    COLOURS

    IOTA 998 is available in black, gray, white and other customized colours.

     

    PACKAGING

    IOTA 998 is available in disposable cartridges (net 300ml) and sausages (net 590ml)

     

    SPECIFICATIONS

    IOTA 998 is designed to meet or even exceed the requirement of Chinese specification JC/T 882-2001 25HM Complies with ASTM C 920

     

    Typical properties

    These values are not intended for preparing specifications.

    Test Method

    Property

    Unit

    Standard

    Result

    GB/T 13477 (ISO 7390)

    Slump

    mm

    ≤3

    ≤3

    0

    0

    GB/T 13477 (ISO 8394)

    Extrusion rate

    ml/min

    ≥80

    856

    192

    GB/T 13477(ASTM D 2377)

    Tack free time

    h

    ≤3

    1.1

    GB/T 13477 (ISO 7389)

    Extension recovery

    %

    ≥80

    97

    GB 16776 (ISO 10563)

    Weight loss

    %

    ≤10

    5.6

    GB/T 13477 (ISO 8339)

    Modulus at 23

    MPa

     

    0.4

    0.84

    GB/T 13477 (ISO 11600)

    Movement capability

    %

    ±25

    ±25 

    GB/T 13477

    Extension/compression rate

    %

    ±25

    ±25

    GB/T 13477

    Adhesion at fixed stretch

     

    No failure

    No failure

    GB/T 13477

    Adhesion after heat contract and cold extension

     

    No failure

    No failure

    GB/T 13477

    Adhesion after UV-water exposure

     

    No failure

    No failure

    *GB: Chinese National Standard   

     ASTM: American Society for Testing and Materials 

     ISO: International Standardization Organization

    The “GB” testing method is equivalent or partly equivalent to that in the “()”

     

    STORAGE AND SHELF LIFE

    IOTA 998 should be stored at or below 27℃ in original unopened containers. It has a shelf life of 12 months from the date of manufacture.

     

    LIMITATIONS

    IOTA 998 should not be applied:

    As structural sealant;

    To the materials that bleed oils , plasticizers or solvents, such as impregnated wood, oil-based caulks;

    In totally confined spaces as sealant requires atmospheric moisture for cure;

     To frost laden or damp surfaces;

    For continuous water immersion;

    When substrate surface temperature below 4℃ or over 50℃ to copper, zinc or lead coated surfaces.

     

    Surface Preparation

    Clean all joints removing all foreign matter and contaminants such as oil, grease, dust, water, frost, old sealants, surface dirt, or glazing compounds and protective coatings.

     

    Application Method

    Install back-up materials or joint fillers, setting blocks, spacer shims, and tapes. Mask areas adjacent to joints to ensure neat sealant lines. Primer is generally not required for non-porous surfaces, but may be necessary for optimal seal performance of certain porous surfaces. So adhesion test is always recommended.

     

    Apply IOTA 998 in a continuous operation using dispensing guns. Before a skin forms, tool the sealant with light pressure to spread the sealant against the backing materials and joint surfaces. Remove masking tape as soon as the bead is tooled.



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