High strength neutral silicone sealant is a single component, neutral curing, high modulus elastic sealing material. Its core advantages include high adhesive strength, strong weather resistance, and no corrosion to metal/coating materials. It is widely used in building curtain walls, doors and windows, sunrooms, and industrial structural sealing.
1、 Core Features
Neutral curing: does not release corrosive substances such as acetic acid during curing, and has no corrosion to glass, coated glass, aluminum alloy, stone, concrete, etc. Its applicability far exceeds that of acidic adhesives.
High strength and high modulus:
Tensile strength: 1.0-2.0 MPa (ordinary sealant is about 0.4-0.6 MPa)
Displacement capability: ± 20% to ± 35%, adaptable to substrate thermal expansion and contraction
Elongation at break: 300% to 400%, good elasticity and crack resistance
Excellent weather resistance: UV resistance, ozone resistance, rain resistance, high and low temperature resistance (-50 ℃~+150 ℃), long-term outdoor use without yellowing or powdering.
Single component room temperature curing: can be cured upon contact with moisture in the air, convenient to use; Dry for about 30 minutes and fully cure for 1-3 days.
Excellent waterproof and mildew proof: After curing, it forms a dense elastic body with strong sealing properties, making it less prone to mold in humid environments.
2、 Main classification (by purpose)
Structural sealant (high-strength grade)
Representative: SSG4800J, DOWSIL 995
Features: Ultra high strength, high modulus, used for structural assembly (such as bonding between hidden frame curtain wall glass and frame).
Standard: Complies with GB 16776 and has a high safety factor.
Weather resistant sealant (universal high-strength)
Representatives: DOWSIL 991, Hesheng HS6100
Features: High elasticity, anti-aging, used for waterproof sealing of exterior walls, doors and windows, aluminum-plastic panels, and sunrooms.
Standard: JC/T 485.
Mold proof sealant (kitchen and bathroom specific)
Features: Added anti mold agent, grade 0 anti mold, suitable for damp areas such as kitchens, bathrooms, basins, bathtubs, etc.
Stone specific sealant
Features: Low pollution, low modulus, preventing stone from being contaminated by oil seepage, suitable for marble and granite joints.
3、 Typical application scenarios
Architectural curtain wall: Structural bonding and weather resistant sealing of glass/aluminum veneer/stone curtain walls.
High end doors and windows: sealing, waterproofing, and fixing of broken bridge aluminum, system windows, plastic steel windows, and walls.
Skylight/Sunroom: High strength sealing of glass and metal frame.
Industrial use: Sealing and bonding of metal components, containers, vehicles, and electronic components.
Indoor decoration: kitchen and bathroom anti mold, stone/tile/aluminum buckle edge finishing, skirting line sealing.
4、 2026 Mainstream Brands and Model Recommendations
Tao Xi (DOWSIL)
991: High performance weather resistant adhesive, low modulus, ± 50% displacement, anti pollution.
995: Structural adhesive, specifically designed for hidden frame curtain walls.
Momentive
SSG4800J: High strength structural adhesive, fast curing.
Hesheng
HS6100: Curtain wall weather resistant adhesive.
HS6300: High modulus, 35 level displacement.
Baiyun, Zhijiang, and Silicon Treasure
997 (structure), 611 (weather resistance): domestically produced high-end, high cost-effectiveness.
5、 Key points for selection and construction
select
Structural assembly must use structural adhesive (GB 16776), and weather resistant sealant (JC/T 485) should be selected for weather resistant joint filling.
Special anti pollution adhesive for stone materials.
Identify national standard certification to avoid low-priced and low-quality adhesives (prone to cracking, oil leakage, and low strength).
construction
The substrate must be dry, clean, free of oil stains and dust.
The optimal construction temperature is between 4 ℃ and 40 ℃, and the humidity is between 40% and 80%.
The joint width * * ≥ 6mm * *, the depth is 1/2 of the width, and the bottom is padded with foam strips to prevent bonding on three sides.
