Gabion Galvanized Wire Coil 4.0mm BWG8 Triple Twist Mesh Weaving Grade

Gabion wire has one job that ordinary fencing wire does not: it must survive being filled with stone, lifted by machine, and then sit in contact with wet drainage for decades. That combination punishes two properties in particular, coating adhesion and elongation. A 4.0 mm BWG8 coil with 240 - 280 g/m2 zinc and 12% - 15% elongation bends around the twisting gears without cracking the coating and keeps enough ductility that the mesh does not snap when stones are dropped in from a height. This is the coil we supply for triple twist gabion and mattress production.

The triple twist detail matters more than buyers expect. In a triple twist mesh the wires wrap three times at each joint, so the wire must tolerate repeated reverse bending in the same small zone. Wire that is drawn too hard, or coated with a brittle high-zinc layer without adequate adhesion control, will show hairline coating cracks at those joints and start rusting from the inside within a season.

• Coating built for stone contact: 240 - 280 g/m2 zinc with tested adhesion resists abrasion from sharp stone edges and continuous damp conditions.
• Ductility for twisting: 12% - 15% elongation lets the wire take three wraps at each joint without cracking or necking.
• Right stiffness for machine weaving: 380 - 500 MPa gives the mesh enough rigidity to keep its box shape when lifted full of stone.
• Gauge consistency: 4.0 mm +/- 0.05 mm keeps twist gear settings stable across a full production run.
• Heavy coils for continuous weaving: 250 - 500 kg coils reduce changeover on gabion mesh lines.
• Optional ZnAl upgrade: ZnAl 5% aluminium coating available for river and coastal gabion where service life is the priority.

Typical use is retaining walls, river and canal bank protection, rockfall netting, bridge abutment protection, coastal revetment and landscaping terraces. Two field notes we pass on to mesh producers: first, specify the coating mass on the finished wire rather than on the black wire, because some suppliers quote before galvanizing; second, if the gabion will be filled with blasted angular rock, ask for the ZnAl coating, since abrasion plus chlorides is the combination that ends plain zinc mesh early. For PVC coated gabion, we supply the same 4.0 mm core with a 0.4 - 0.5 mm PVC sleeve in grey or green.

Testing covers diameter, tensile, elongation, torsion, coating mass and coating adhesion by bend and wrap test. Coil weight is verified on calibrated scales and winding quality is inspected for cross-overs and kinks. The shipment documents include a mill test certificate to ASTM A641 Class 3 or EN 10223-3, coating mass report per coil, packing list with weights and certificate of origin. For projects with an engineer's specification, we can test against the specified figures and issue a report signed against that specification.

Coils are palletised or bundled horizontally, wrapped in VCI paper and plastic film, covered with hessian and secured with steel straps, then labelled with coil number, weight, coating mass and heat number. A 20 foot container carries about 25 tons. Lead time is 15 - 20 days after deposit, with heavier ZnAl or PVC sleeved versions at 25 days. Shipping documents are issued for T/T or L/C settlement, and inspection by SGS or BV can be arranged before loading.