Sealing GRC Panel-to-Metal Component Connections: Triple Treatment Method to Eliminate Leakage and Corrosion

The connection sealing between GRC panels and metal components is key to waterproofing and corrosion resistance; improper sealing can easily lead to rainwater intrusion and metal rusting, which in turn affects overall structural safety. Qinglong Group, which has undertaken coastal projects such as Hainan Poly Peninsula No.1, has summarized safe and reliable sealing treatment methods over 28 years, ensuring connection areas remain leak-free and rust-free for 20 years.

Sealing treatment must balance waterproofing, corrosion resistance, and compatibility—preventing moisture intrusion while accommodating the thermal expansion and contraction differences between GRC and metal. Through material selection, process optimization, and protection upgrades, Qinglong has developed a comprehensive sealing treatment system.

Sealant Material Selection: Matching Scenarios and Materials

Use neutral weather-resistant sealants, such as silicone sealants and polysulfide sealants, to avoid corrosion of GRC and metal by acidic or alkaline materials. For coastal areas or humid environments, choose mold-resistant and anti-corrosion sealants that withstand salt spray erosion; for high-temperature environments, choose high-temperature-resistant sealants capable of withstanding temperatures above 60°C. Qinglong's independently developed GRC-specific sealant offers excellent compatibility with GRC substrates and metal, with a bonding strength of ≥1.5MPa.

Sealing Construction Process: Refined Operations Ensure Effectiveness

Before construction, clean dust and oil from the connection area to ensure the surface is dry and clean; control the gap within 5-10mm and the filling depth at ≥15mm. Adopt a triple structure of "primer + sealant + backing material", using polyethylene foam rods as the backing material to prevent bonding failure caused by direct contact between the sealant and the base layer. Fill the sealant fully and evenly, free of air bubbles and gaps, and smooth it with specialized tools to ensure close adhesion to the contact surfaces. In the Singapore National Service center project, Qinglong achieved excellent sealing performance at connection areas with this process, resisting the erosion of the marine climate.

Anti-Corrosion Protection Upgrade: Extending the Service Life of Connection Areas

Apply two coats of anti-corrosion paint to the connection surfaces of metal components, with an additional anti-corrosion coating at weld seams to prevent rust expansion from damaging the sealing layer. Install anti-corrosion gaskets, such as rubber or nylon gaskets, at the contact points between GRC panels and metal to separate the two materials and reduce electrochemical corrosion. In the Hainan Yuanyang project, Qinglong combined anti-corrosion protection with sealing treatment, keeping connection areas rust-free and leak-free over long-term use.

The connection sealing between GRC panels and metal components is a typical example of details determining success or failure. For 28 years, Qinglong has consistently adhered to the principles of "material matching, refined workmanship, and thorough protection", eliminating leakage and corrosion risks through scientific sealing treatment. Reliable sealing treatment not only ensures structural safety but also extends the service life of GRC exterior walls—a concrete embodiment of Qinglong's "meticulousness" motto.