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Photos 1 FKBL013-High coefficient of expansion, low softening temperature, high insulation, lead-free, glass-ceramic for sealing Customers who bought this product also bought
Sealant Glass Ceramic For Electric Heaters
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  • Glass Sealing - For High Temperature Electric Heater Sealing

    The compressive strength of glass material is greater than the tensile strength, therefore, in the structural design with a glass seal, when the electric heater cools, the metal at the end of the tube which is not sealed can be free to shrink. A bending moment is generated at the intersection of the glass and metal, and because of the symmetry of the two sides, the moments cancel each other out and the seal is reliable.

    Generally, glass powder and glass beads (ring) are used. Glass beads (ring) is made of proprietary glass powder pressed into a variety of shapes and sizes, sintered into a certain strength, and made easy for assembly operations. There are two kinds of common glass, one containing lead (Pb) and the other lead-free. The lead-free ones comply with ROHS directive.

    FKBL013-High coefficient of expansion, low softening temperature, high insulation, lead-free, glass-ceramic for sealing

    This product is used for sealing the metal electric heaters.

    Notes before sealing:

    1. If you are using a heater such as box-type electric furnace, oven or toaster, be sure to calibrate the temperature zone, otherwise the sealing glass may not be melted or the temperature may be too high because the actual temperature is lower than the displayed temperature.
    2. Before sealing, please make sure that your heating elements has been dried and the inner mgo powder is tightly filled.

    The figure is a recommended temperature for box-type electric furnace sealing. Please pay attention to the cooling process after the sealing is completed.

    glass-sealing-for-electric-heaters.jpg

    Cautions:

    1. Please remove moisture before sealing;
    2. Do not use silicon sealant , silicone oil etc before sealing;
    3. If the sealing temperature is too high, the metal materials may enter into the sealing glass and affect the insulation performance.

    If you are using a high-frequency heating machine or a flame spray gun etc., please heat until it melts and then cool down slowly (quick cooling is not suitable).

    Basic properties of sealing glass before sealing
    Glass softening temperatureGlass transition temperatureAverage coefficient of thermal expansion ( RT-300 °C)End operating temperatureResistivity (25 °C )
    430~440 °C400~410 °C9.3±0.5×10-6 /°C≤350 °C109 Ω·m
    Leakage current detection (detection voltage 1000 V)Insulation resistance detection (detection voltage 1000 V)
    Temperature(°C)Leakage current (mA)Temperature(°C)Insulation resistance( )Remark
    10001002×106Testing is performed on the insulating material itself,after packing according to the company's internal standards, which may affect the results.
    2500.0072501.5×103
    3000.01630055
    3500.0433506
    RoHS Testing
    substanceDetection valuesubstanceDetection valueRemark
    Pb not detectedHgnot detectedTesting agency SGS, other macromolecular substances are not detected。
    Cr6+ not detectedCdnot detected

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