Waterproof Mechanism of Glass Sealant for Glass Joints

Basic Requirements for Waterproof Performance of Glass Sealant  

Most importantly, glass sealant for glass joints is required to be waterproof and breach no gaps for water to seep gaps from all angles. First, it has to be unbroken, rapid and pliable like bonded overlap at the joint. Second, the sealant has to effectively tolerate the elements, be it hot glass expanding or cold glass contracting. The material has to adapt and change to ensure the sealant remains waterproof over the long term. Ultimately, the waterproof sealant must tolerate the type of degradation that exposure to UV light and rainwater causes over time to prevent a loss in waterproof sealant.

Waterproofing Glass Sealants: Formation of Sealing Layers

Most glass sealants are waterproofed through creation of high quality sealing layers. When sealants are applied to glass joints, glass sealants are undergoing a curing reaction. The materials in the sealants form a network of lightweight polymers, which are structurally cohesive for many joints. It essentially fills in any little gaps "waterproofing" or blocking any possible openings for water to penetrate. In addition to this, the sealing layers bonded to the glass, possess adhesion. It will form a complete seal to ensure no water will slip through the adhesive at any interface.

Auxiliary Waterproof Mechanism: Material Performance Support

The properties of the sealant also assist in the waterproof functionality. A number of high-performance glass sealants are made of silicone or acrylic which are also repellant of water. Sealants will have water droplets bead and slide off instead of penetrating into the sealant. For sealants which have special waterproofing additives, the material will enhance water resistance and the sealant will still retain waterproof functionality even in prolonged wet environments. Weathering of the material is also important. It will withstand the destructive forces of the sun, rain, and temperature shifts which will ensure the sealant will not crack, peel and become brittle and the waterproofing will be effective for a prolonged period of time.

Application Tips for a Waterproof Effect

For glass sealant to work it’s best, it must be applied correctly. Before applying the sealant, the glass joint surface must be free of any residue. Sealant adhesion is poor with dust, oil stains, or any impurities in the joint that will create gaps between the sealant and the glass resulting in potential water leaks. Then, for the application scenario, identify the appropriate sealant type. For example, in outdoor environments with large temperature changes, choose sealants that are more flexible and able to withstand extreme weather. During the sealant application, ensure the amount and speed are controlled, so that sealant fills the joint evenly and creates a smooth, continuous seal. Wait for the sealant to completely cure, or dry, before using the area. Using the area too soon, before the sealant is fully dry, can disturb the seal and compromise the area’s ability to repel water.