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  • IOTA GF998 Fire Resistant Silicone Weatherproofing Sealant

    IOTA GF998 Fire Resistant Silicone Weatherproofing Sealant

    1. Weatherproofing joint seal for the curtain wall with fire resistance requirement; 

    2. ±25% movement capacity

     

    Features

    1.FV-0 class fire resistance ,the highest rate in China

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

    3.Neutral cure – suitable for use on metals, coated glass, aluminium panels, terracotta panels, concrete materials, galvanized steel and many other substrates.

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

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

    6.Excellent unprimed adhesion to a wide variety of construction materials

    7.Easy of application-ready to use as supplied 

    8.Good compatibility with other neutral silicone sealants

     

    COLOURS

    IOTA GF998 is available in black and gray

     

    PACKAGING

    IOTA GF998 is available in disposable cartridges (net 300ml) and sausages (net 590ml).

     

    SPECIFICATIONS

    IOTA GF998 is designed to meet or even exceed the requirements of 

    Chinese specification JC/T 882-2001 25HM & GB/T 2408-2008

    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

    842

    GB/T 13477 (ASTM D2377)

    Tack free time

    h

    ≤3

    1.3

    GB/T 13477 (ISO 7389)

    Extension recovery

    %

    ≥80

    96

    GB 16776

    Weight loss

    %

    ≤10

    4.0

    GB/T 13477 (ISO 8339)

    Modulus at 23

    MPa

     

    0.4

    0.74

    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 water exposure

     

    No failure

    No failure

    GB/T 2408

    Fire resistance rate

     

    FV-0

    FV-0

    *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 “()”.

     

    Others

    STORAGE AND SHELF LIFE

    IOTA GF998 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 GF998 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 surface temperature below 4℃ or over 50℃

    To copper, zinc or lead coated surfaces

     

    HOW TO USE

    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 GF998 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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