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Metallic or Plastic Coating of Gabion for Different Sites

To reach a durable service life, woven gabion basket, welded gabion baskets and gabion mattress should be coated. Targeted at different demand, various environments and budget, we recommended you three coating method as follows:

Table 1: Description of Environment of Installation Site, Coating Wire Requirements and Working Life
Site Environment Levela (In Accordance with EN ISO 9223:2012, Table 1) Plastic Coating Material Coating Classb,c (In Accordance with EN 10244-2) Assumed Working Life of The Product (Year)f
Low Aggressive: (C2)
Dry conditions
Temperate zone, atmospheric environment with low pollution, e.g.: rural areas, small towns (over 100 m above see level). Dry or cold zone, atmospheric environment with short time of wetness, e.g. deserts, subarctic areas.
- EN ISO 1461c - See EN ISO 14713-1
- Zn 95%/Al 5% alloye A > 50e
Medium aggressive: (C3)
Dry conditions
Temperate zone, atmospheric environment with medium pollution or some effect of chlorides, e.g. urban areas, coastal areas with low deposition of chlorides, e.g. subtropical and tropical zone, atmosphere with low pollution.
- EN ISO 1461c - See EN ISO 14713-1
- Zn 95%/Al 5% alloye A 25e
Polyvinyl chloride (PVC) Zn 95%/Al 5% alloye A 120e
High aggressive: (C4)
Wet conditions
Temperate zone, atmospheric environment with high pollution or substantial effect of chlorides, e.g. polluted urban areas, industrial areas, coastal areas, without spray of salt water, exposure to strong effect of de-icing salts e.g. subtropical and tropical zone, atmosphere with medium pollution industrial areas, coastal areas, shelter positions at coastline.
- EN ISO 1461c - See EN ISO 14713-1
- Zn 95%/Al 5% alloye A 10e
Polyvinyl chloride (PVC) Zn 95%/Al 5% alloye Aa 120a
Very High aggressive: (C5)d
Wet conditions
Temperate and subtropical zone, atmospheric environment with very high pollution and/or important effect of chlorides, e.g. industrial areas, coastal areas, shelter positions at coastline.
Polyvinyl chloride (PVC) Zn 95%/Al 5% alloye A 120e
Extreme aggressive: (CX)d
Subtropical and tropical zone (very high time of wetness), atmospheric environment with very high pollution SO2 (higher than 250 μg/m3) including accompanying and production ones and/or strong effect of chlorides, e.g. extreme industrial areas, coastal and off shore areas, occasionally contact with salt spray.
Polyvinyl chloride (PVC) Zn 95%/Al 5% alloye A > 50e
a Gabion products immersed in water (saline and/or polluted water) and/or in contact with alkaline solutions, or gabions which are subject to abrasive conditions (sand storms, …) shall be metallic coated with plastic coated or shall be made from stainless steel wire.
b Accessories have the same coating as the mesh or better.
c Heavier coating weights than the minimum requirements are possible.
d For C5 and CX classes, for metallic coatings a specific agreement can be made between purchaser and supplier.
e There exist more advanced metallic coatings with a superior corrosion resistance and expected higher assumed working life which should be proved. In terms of salt spray performance (in accordance with EN ISO 9227), it means that the mesh samples shall not show more than 5% of DBR (Dark Brown Rust) after 2000 h exposure on the surface. When subjected to test in sulphur dioxide environment (in accordance with EN ISO 6988), mesh samples shall not show more than 5% of DBR (Dark Brown Rust) after 56 cycles of discontinuous test on the surface. Assumed working life values will be therefore improved depending upon the prevailing conditions.
f The life of zinc or zinc alloy coatings is directly proportional to its coating weight. When higher coating weights are used, the assumed working life can be adjusted accordingly.

Note:

  • The assumed working life in table can not be interpreted as being a guarantee life.
  • Advanced metallic coatings are available for your special demand.
  • Standard EN ISO 1461 gives requirements for hot dip galvanized coatings, we strictly follow the standard when manufacturing.
  • Standard EN ISO 14713-1, aiming at the coating in Standard EN ISO 1461, gives detailed lifetime for different situation like in door and outdoors.

 

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