What Are The Classification And Characteristics of Construction Silicone Sealant?

Generally, building silicone sealants on the market are classified and named according to their uses, and can be roughly divided into five categories: silicone structural adhesives, silicone weather-resistant adhesives, ordinary silicone adhesives, secondary silicone sealants for insulating glass, and special-purpose adhesives. Silicone sealant.

1. Silicone structural adhesive

Uses: Mainly used for structural bonding of glass and aluminum sub-frames of hidden frame glass curtain wall or semi-hidden frame glass curtain wall

Features: Glue the glass to the aluminum sub-frame, withstand the weather aging of ultraviolet rays, ozone, moisture, etc. for a long time (not less than 25 years); withstand the load caused by wind, gravity, temperature, etc., and have high requirements for strength and aging resistance , there are certain requirements for elasticity.

2. Silicone weather-resistant adhesive

Application: It is used to seal the joints of various curtain walls (see Figure 1) to ensure the airtightness and watertightness of the curtain wall.

Features: It needs to withstand large seam width changes and weather aging from outdoor ultraviolet rays, ozone, moisture, etc. for a long time. It has high requirements for elasticity (displacement capacity) and aging resistance, and does not require strength.

3. Ordinary silicone sealant

Uses: used for door and window joints, exterior wall caulking, interior decoration sealing and other position sealing

Features: To withstand the relatively small change in the width of the joint, there is a certain requirement for displacement capacity, and no strength is required. Outdoor joints have high requirements on aging resistance, while indoor joints have certain requirements on aging resistance.

4. Secondary silicone sealant for insulating glass

Application: It is used for the secondary sealing of insulating glass to ensure the stability of the insulating glass structure. According to the stress situation, it is divided into secondary sealant for insulating glass for structure (mainly used for insulating glass of hidden frame and semi-hidden frame glass curtain wall) and Non-structural insulating glass secondary sealant (mainly used for open frame curtain wall and insulating glass for doors and windows).

Features: high modulus, not too soft, high requirements for aging resistance

5. Special purpose silicone sealant

Uses: Used for joint sealing with special requirements, such as fireproof sealant used for fireproof sealing of various layers of curtain wall engineering, fireproof sealing of various doors and windows, indoor fireproof partitions and fireproof sealing of interior decoration, etc. (see Figure 4); anti-mildew The sealant is used for the installation of various kitchen utensils and sanitary ware, as well as waterproof and mildew-proof sealing (see Figure 5).

Features: It needs to have some special properties (such as mildew resistance, fire prevention, etc.).