Requirements for galvanized cable tray galvanizing thickness

Hot-dip galvanized cable trays typically require a zinc coating thickness of 45–65µm (325–460 g/m²), while electro-galvanized trays require a minimum of 12µm.

Hot-Dip Galvanized Cable Trays

• Minimum Zinc Thickness: For standard tray components (side plates and base plates 1.5–3mm thick), the zinc coating should be at least 45µm, corresponding to a coating mass of 325 g/m². Heavier components like brackets and supports (>3mm) require ≥55µm thickness .
• Severe Environments: For outdoor or highly corrosive conditions, standards such as ASTM A123/A123M specify Coating Grade 65, with an average zinc coating weight of 460 g/m² per side or 0.065 mm (65µm) thickness .
• Appearance and Quality: The coating must be continuous, uniform, and free from defects like bare spots, blisters, or excessive zinc dross . Damaged areas should be repaired with compatible materials to maintain corrosion protection .

Electro-Galvanized Cable Trays

• Minimum Zinc Thickness: Electro-galvanized trays require a minimum of 12µm zinc coating .
• Environmental Suitability: This thin coating is suitable only for dry indoor environments. It is not recommended for outdoor or marine transport, as it can quickly develop white or red rust in humid or salty conditions .

Component-Specific Thickness

• Side Plates and Rungs: For ladder-type trays with widths 150–400mm, side plates and rungs should be ≥1.2mm thick; cover plates ≥0.6mm .
• Wider Trays: For trays 500–800mm wide, steel bridge thickness should be ≥2.0mm, aluminum ≥2.2mm, and fiberglass ≥4.5mm .

Summary

• Indoor, low-corrosion environments: Electro-galvanized, ≥12µm.
• Outdoor or corrosive environments: Hot-dip galvanized, 45–65µm (325–460 g/m²), with higher thickness for severe conditions.
• Critical components: Ensure side plates, rungs, and covers meet minimum thickness requirements and repair any damaged areas to maintain coating integrity. Proper selection of galvanizing thickness ensures long-term corrosion resistance, especially in outdoor, coastal, or industrial environments.