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Week 8

A sealant is a mounting solution used in building and construction works. It is a pasty and plastic mass based on various polymers. Being applied to any surface, the sealant gradually solidifies, forming an airtight and moisture resistant layer. For the storefront windows and doors or for the usual plastic windows, a white sealant is mostly used. It protects structures from atmospheric influences and temperature differences, gives them an aesthetic appearance.

There are many varieties of sealants, so try to figure out which sealant is better for your PVC plastic windows. Below we will observe the main types of sealing compounds that can be used to seal plastic slots. Particular attention will be paid to their adhesive and strength properties.


This is a universal substance, based on the organosilicon solution. It can be used both indoors and outside. Its goals are elasticity, high adhesive qualities, ease of application and affordable cost. It is divided into acid and neutral types. When the acidic sealant is used in the room, a smell of vinegar can appear in there. It disappears afterward. Silicone does not shrink or lose its color and elasticity.

Tip: It is recommended to use a sanitary silicone sealant for plastic windows inside the building. It is resistant to the formation of mold and all kinds of fungi, so it will always retain its whiteness.


It is also elastic; it is washed off in a liquid state with water. It is used mainly for outdoor works, for sealing of assembly seams, as it is resistant to ultraviolet rays and atmospheric precipitation. For internal works, it is not widely used. The porous structure of the frozen sealant eventually absorbs all kinds of evaporation from the side of the dwelling. This can make the sealed layer darken with time. To prevent darkening, it is recommended to dye regularly. Acrylic sealant for plastic windows for the winter for external use is of low cost.

Sealant on PVC base (polymer)

It is based on MS-polymers. It is also called liquid plastic. It has excellent adhesion and toughness. After covering the seams of the plastic windows, a single structure is formed with this material. The only requirement for the use of this type of sealant is the absence of anything that can lead to the rupture of the hardened material. For white polymeric sealant for windows, the price is high because of its high-tech properties.

Polyurethane Sealant

This viscous material based on polyurethane polymers easily entering into adhesion with virtually all materials, including PVC. After solidification, it can be painted or covered with a layer of varnish.

Butyl sealant

These are made on the basis of polyisobutylene (rubber-like substance). Its elasticity is stable in temperatures ranging from -55 to +100 degrees. It is resistant to ultraviolet light and is completely harmless. It is used not only for sealing gaps but also for repairing insulating glass because it has a high vapor permeability.

Now you know how to choose the sealant for the storefront windows and doors or usually plastic windows.

Source by Emma Kalman
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