Technical specifications CT15 (Cable Tray perforated)
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Requirements for the zinc plating thickness of galvanized cable trays
The standard zinc coating thickness for galvanized cable trays ranges from 12 µm for electro-galvanized trays to 65 µm or more for hot-dip galvanized trays, depending on steel thickness and environmental conditions.
Hot-Dip Galvanized (HDG) Cable Trays
Hot-dip galvanizing provides a thick, durable zinc layer that offers long-term corrosion protection. The minimum zinc coating thickness is typically 65 µm (0.065 mm) per side, corresponding to a coating weight of 460 g/m² per side, as specified in ASTM A123/A123M and industry standards for carbon steel cable trays . For tray components with thicker steel (over 3 mm), the local zinc thickness may be increased to ≥55 µm to ensure adequate protection . In typical atmospheric environments, a coating of 50–100 µm can provide decades of corrosion resistance, with thicker coatings recommended for industrial, coastal, or high-humidity environments .
Electro-Galvanized Cable Trays
Electro-galvanizing produces a thinner zinc layer, suitable for indoor or less corrosive environments. The minimum zinc thickness for electro-galvanized trays is 12 µm, as defined in GB/T 26941.1-2011 . This method offers limited corrosion resistance compared to hot-dip galvanizing and is generally not recommended for outdoor or highly corrosive conditions.
Measurement and Compliance
- Local thickness: Measured at multiple points using a magnetic thickness gauge; all points must meet the minimum requirement .
- Mean coating mass: Determined gravimetrically for arbitration purposes, representing the average zinc mass per unit area .
- Appearance: Coating should be continuous, uniform, and free from defects such as bare spots, blisters, or excessive zinc dross .
Environmental Considerations
- Indoor/mild environments: 20–50 µm may suffice.
- Industrial/coastal/high-humidity environments: 70–100+ µm recommended for long-term durability .
- Repair and maintenance: Damaged areas should be repaired with compatible zinc-rich compounds to maintain corrosion protection .
Summary Table
| Galvanizing Method | Minimum Zinc Thickness | Typical Application |
|---|---|---|
| Electro-galvanized | 12 µm | Indoor, low-corrosion environments |
| Hot-dip galvanized | 65 µm (0.065 mm) | Outdoor, industrial, coastal, or highly corrosive environments |
| HDG thicker steel components | ≥55 µm | Brackets, supports, or steel >3 mm |
Selecting the appropriate zinc coating thickness ensures long-term corrosion resistance, structural integrity, and compliance with international standards such as ASTM, ISO, and GB/T. Regular inspection and maintenance further extend the service life of galvanized cable trays .
Full cable tray systems specification document
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