European channels offer GB-equivalent surface treatments, tailored to Chinese climates:
Hot-Dip Galvanizing: Per EN ISO 1461 (same as GB/T 13912), zinc coating (85 μm min) for outdoor use (e.g., coastal bridges). UPE/UPN channels with this treatment match GB C-profiles' corrosion resistance, lasting 20+ years in saltwater environments.
Primer Coating: Zinc-rich primer (EN ISO 12944, equivalent to GB/T 27806) for indoor applications (e.g., factory frames). Dries in 2 hours (same as GB primers), compatible with Chinese topcoats (e.g., polyurethane).
Mill Finish: Oxide layer from rolling (EN 10279), suitable for dry indoor use (e.g., warehouse supports). Matches GB C-profiles' mill finish, requiring no additional treatment.
All treatments are tested for adhesion and thickness, with results in MTRs. European channels use the same surface processes as GB, ensuring consistency in project aesthetics and durability.