Engineering specific neutral silicone sealant is the most commonly used sealing and bonding material in construction and industrial engineering. Its core advantages are neutral curing, non corrosiveness, and strong weather resistance, which distinguishes it from acidic adhesives (which can corrode metals and coated glass). Mainly used for permanent engineering sealing of curtain walls, doors and windows, exterior walls, metal structures, etc.
1、 Core Features
Neutral curing: releases ketoxime/alcohol substances during curing, does not corrode metals, coated glass, and stone, and has a wide range of applications.
Single component room temperature curing: in the form of a paste, it solidifies into elastic rubber when exposed to moisture in the air after extrusion, making it easy to apply.
Excellent weather resistance: UV resistance, high and low temperature resistance (-50 ℃~150 ℃), ozone resistance, aging resistance, no cracking or powdering for long-term outdoor use.
High elasticity and displacement capability: Modulus options (low/medium/high), displacement capability of 20-50 levels, suitable for structural thermal expansion and contraction.
Good adhesion: It can firmly bond to most building materials such as glass, aluminum, plastic steel, stone, concrete, ceramic tiles, etc. without the need for a primer.
2、 Main classification (commonly used in engineering)
Silicone structural sealant (structural adhesive)
Purpose: Structural bonding of curtain walls (such as bonding between hidden frame curtain wall glass and frame), bearing loads.
Key: Must have national structural adhesive certification, high strength, high modulus, and extremely strict safety requirements.
Neutral silicone weather resistant sealant (weather resistant sealant)
Purpose: Weather resistant sealing, waterproofing, and weathering resistance for curtain walls, doors and windows, and exterior wall joints, without bearing structural loads.
Features: Emphasis on aging resistance, high displacement ability, and flexibility.
Special sealant for doors and windows
Usage: Installation of aluminum alloy/plastic steel doors and windows, glass embedding, and filling of internal and external wall joints.
Features: Medium to high modulus, high cost-effectiveness, balancing sealing and weather resistance.
3、 Typical technical parameters (engineering level)
Appearance: Ceramic white, black, gray, transparent and other paste like bodies.
Curing method: room temperature moisture curing.
Dry time: 15-60 minutes.
Complete curing: 3-7 days (longer for thicker seams).
Displacement ability: Level 20, Level 25, Level 35, Level 50 (the larger the number, the stronger the joint adaptability).
Hardness (Shore A): 25-45.
Working temperature: -50 ℃~150 ℃.
4、 Scope of Engineering Application
Curtain wall engineering: structural bonding and weather resistant sealing of glass curtain walls, aluminum-plastic panels, and stone curtain walls.
Door and window engineering: installation of aluminum alloy and plastic steel doors and windows, glass embedding, and filling of internal and external wall joints.
Decoration/Civil Engineering: Waterproofing and sealing of joints in stone, concrete, ceramic tiles, skylights, and sunrooms.
Industrial/Metal: Sealing and rust prevention of metal plates, steel structures, stainless steel, and aluminum components.
5、 Key points for purchasing (must see for engineering)
Distinguish between structural adhesive and weather resistant adhesive: Structural adhesive must be used for structural stress areas, while weather resistant adhesive is used for ordinary joints.
Certification: GB 16776 (structural adhesive) and GB/T 14683 (weather resistant adhesive).
Displacement level: Choose level 50/35 for curtain walls/large joints; Select level 25 for doors and windows/small gaps.
Color: Black and gray are commonly used for exterior walls; Porcelain white and silver gray are commonly used for doors and windows.
