Sealing Treatment Methods for GRC Panel-to-Metal Component Connections? Complete Waterproofing and Anti-Corrosion Solution

The core of sealing treatment for GRC panel-to-metal component connections lies in "waterproofing, anti-corrosion, and deformation resistance", which requires triple assurance through "sealant material selection, joint structural design, and construction process standards". Qinglong adopts weather-resistant sealant + tongue-and-groove joint design, achieving a waterproof and anti-corrosion service life of ≥15 years for connection areas. Projects such as the Singapore National Defense Service Center and Sanya Yingbin No. 1 have shown no leakage or corrosion issues.

1. Precise Selection of Sealing Materials: Core Function Assurance

Material selection determines sealing performance and durability. Sealant type: neutral weather-resistant silicone sealant (elongation ≥500%) is selected for compatibility with both GRC and metal; Qinglong uses sealant compliant with the GB/T 14683 standard, with no cracking after 1000 hours of UV aging. Anti-corrosion coating: metal component surfaces are coated with fluorocarbon anti-corrosion paint (thickness ≥80μm); Qinglong's fluorocarbon paint has an adhesion grade of ≥1 and salt spray corrosion resistance of ≥1000 hours. Filler material: foam rods (diameter 20% larger than joint width) fill the bottom of the gaps to prevent three-side adhesion of the sealant; Qinglong's foam rods have a density of ≥30kg/m³ and an elastic recovery rate of ≥90%. Adhesion promoter: a primer is applied to the contact surfaces between GRC panels and sealant to enhance bonding strength; Qinglong's primer has a bonding strength of ≥1.0MPa, preventing debonding.

2. Optimized Joint Structural Design: Avoiding Seal Failure

Joint design is adapted to deformation and waterproofing requirements. Tongue-and-groove joints: GRC panels have reserved tongue-and-groove grooves into which metal components are inserted, with joint widths of 8-12mm; Qinglong's tongue-and-groove depth is ≥20mm, extending the waterproofing path. Drainage design: drainage holes (diameter 8-10mm) are reserved at the bottom of joints with spacing ≤1m; on Qinglong's Sanya Yingbin No. 1 project, drainage holes are spaced at 800mm for rapid rainwater discharge. Expansion compensation: elastic cushion layers (rubber or polyethylene boards) are installed to absorb thermal expansion and contraction deformation; Qinglong's elastic cushions are 5mm thick with a compression deformation rate of ≥30%. Anti-corrosion isolation: anti-corrosion isolation pads are placed between metal components and GRC panels to avoid electrochemical corrosion; Qinglong's isolation pads provide corrosion resistance for up to 20 years.

3. Construction Process Standards and Qinglong Project Practice

Standardized construction ensures sealing quality. Surface cleaning: connection areas are cleaned of dust and oil and kept dry; before construction, Qinglong cleans with a high-pressure air gun + alcohol, achieving 99% cleanliness. Sealant application: a dedicated caulking gun is used with steady, uniform application to ensure full sealant joints free of air bubbles; Qinglong controls the application pressure at 0.3-0.5MPa, with joint flatness ≤1mm. Flattening and trimming: after application, the sealant is flattened with special tools to remove excess material; after Qinglong's trimming, sealant joints are uniform in width with improved aesthetics. Curing: the sealant is naturally cured for ≥7 days to avoid early loading; Qinglong prohibits impact and water contact during the curing period. Project case: for the Singapore National Defense Service Center international project, GRC panels were connected to stainless steel components using Qinglong's sealing solution; after 10 years of use in a coastal high-salt-spray environment, there has been no corrosion or leakage, earning recognition from international clients.