neutral silicone sealant for exterior wall is a one component, neutral curing silicone adhesive specially designed for weatherproof sealing of exterior wall of buildings. Its core is used for waterproofing and aging resistance of exterior wall joints, non corrosive metal and non polluting substrate.
1、 Core features (specifically designed for exterior walls)
Neutral curing: does not release corrosive substances such as acetic acid during curing, and has no corrosion or whitening pollution to aluminum alloys, steel, concrete, stone, coated glass, etc.
Super weather resistance: UV resistant, ozone resistant, high and low temperature resistant (-50 ℃~150 ℃), long-term outdoor exposure without cracking or powdering.
High elastic displacement: The displacement capacity is usually * * ± 25%~± 50% * * (25/35/50 levels), suitable for external wall thermal expansion, contraction, and settlement displacement.
Waterproof and impermeable: after curing, it is a compact elastomer, which can prevent long-term waterproof, typhoon storm and rain leakage.
No sagging: The construction of the facade/top joint does not flow or fall.
2、 Main purpose (exterior wall scene)
Glass/aluminum/stone curtain wall non structural weather resistant sealing (peripheral joints, vertical and horizontal joints)
Aluminum alloy/plastic steel doors and windows and wall installation, joint filling and sealing
Sealing and waterproofing of joints between aluminum-plastic panels, integrated panels, and insulation panels for exterior walls
Sunroom, skylight, canopy glass/metal joint sealing
Filling of expansion/settlement joints in concrete exterior walls and prefabricated panels
3、 The difference between acidic adhesive and structural adhesive
Neutral silicone weather resistant adhesive (for exterior walls)
Curing: neutral, non corrosive
Performance: Weather resistance, elastic displacement, waterproof
Purpose: Sealing of non structural joints on exterior walls
Taboo: Cannot be used for structural bonding
acid silicone sealant
Curing: Release acetic acid, with a sour taste
Disadvantages: Corrosion of metals, coated glass, concrete
Applicable: Only for ordinary glass and indoor non-metallic scenes
silicone structural adhesive
Performance: High strength, high modulus, structural bonding
Purpose: Structural bonding of curtain wall glass (load-bearing)
Price: much higher than weather resistant adhesive
4、 Construction points (must see for exterior walls)
Substrate processing
Thoroughly clean: remove dust, oil stains, old glue, release agent, wipe with alcohol/acetone and dry.
Concrete/stone: It is recommended to apply a special primer to enhance adhesion.
Wide seam: insert the foam backing strip (to prevent three side bonding and control the glue thickness).
Glue application construction
Sew the edges with decorative paper to ensure a straight edge.
Apply glue uniformly at a 45 ° angle with a glue gun to ensure fullness and no voids.
Immediately use a scraper to level and compact, and repair within 5-10 minutes.
Curing and maintenance
Surface drying: about 30-60 minutes
Initial curing: 24 hours (can be lightly touched)
Complete curing: 7 days (to achieve final performance)
Do not water or disturb before solidification.
5、 Selection and Common Models
Key points for selection
Identify the GB/T 14683 standard
Priority should be given to using Grade 25/35/50 displacement weather resistant adhesive for exterior walls
Color: mainly black, gray, and white (matching the exterior wall)
Common brand models
Daokangning (Tao Xi): 791 (mainstream exterior wall weather resistance)
Dongfang Yuhong: G-998
Three Trees: SK-3180
Wack GE、 Baiyun, Zhijiang, etc
