• What are the main reasons for poor adhesion of silicone sealant?

    1. The diversity of substrate types and surface treatment methods may lead to poor adhesion between sealant and substrate;
    2. The construction is not standardized, such as the surface of the substrate is not cleaned thoroughly, the curing environment or time does not meet the requirements, the primer is not applied as required, and the proportion of the two components is not equal.
    Preventive measures: Before construction, adhesive and compatibility tests must be conducted on the substrate.
    After passing the test, adhesive can be applied, and if necessary, primer can be applied;
    Before applying glue, dust, oil stains and other dirt on the surface of the substrate must be cleaned according to the prescribed method;
    Single component curing for at least 7 days, dual component curing for at least 3 days, and the curing time should be extended in low temperature and humidity conditions.

  • What are the main reasons for the yellowing or discoloration of silicone sealant?

    1. Attachment materials such as EPDM rubber strips, chloroprene rubber, and asphalt paint are incompatible with silicone sealant, resulting in yellowing or discoloration;
    2. Discoloration of silicone sealant caused by contact with acid (some cleaning fluids) and alkaline (cement slurry) substances;
    3. Deketoxime type silicone adhesive is prone to overall discoloration in acidic environments.
    Preventive measures: Conduct compatibility tests on accessory materials before construction, and apply adhesive only after passing the test;
    Avoid contact with corrosive substances or exposure to corrosive environments with silicone sealant.

  • What are the main reasons for the swelling of silicone sealant seams?

    Bulging is the result of a combination of factors such as the curing speed of the adhesive (relatively slow curing speed), environmental humidity (humidity below 30%), environmental temperature difference, adhesive seam width, panel material and size, etc.
    All of these factors are unfavorable and have a higher probability of occurrence.
    The glue is applied between the aluminum plates of the external wall of the building.
    The aluminum plate is a material with a large expansion coefficient.
    The temperature difference between day and night is large during construction.
    The large aluminum plate also has more thermal expansion, and the interface displacement is large.
    The actual displacement of the interface after the silicone sealant is caulked is borne by the glue joint.
    During the curing process of the silicone sealant, excessive and repeated expansion displacement will cause the glue joint to fold and bulge.
If you have any product issues, please feel free to consult us at any time.
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