Underground utility tunnel has high humidity and corrosive soil environment, so surface coating of strut channel / utility tunnel bracket directly decides service life.
Hot dip galvanizing (HDG) is the most popular surface treatment for unistrut strut channel. The zinc coating forms metallurgical bonding with steel substrate, providing long-term anti-corrosion protection, superior to powder coating or pre-galvanized for underground environment.
Key selection checklist:
Steel grade: Q235 / SS304 for special corrosive area
Coating thickness for HDG
Channel profile: 41x41,41x21 standard unistrut size
Load test report and certification
Senji Asia provides HDG unistrut channel, utility tunnel brackets and matching fittings with full technical test documentation for M&E consulting firms and contractors.
