Zinc Wire Price per Ton: Cost Structure, Grades and Zinc-Aluminum Comparison
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Why the Price per Ton Is a Range, Not One Number
A zinc wire quotation is a composite figure. Two coils of the same diameter can differ noticeably in price per ton because they differ in zinc grade, drawing route, spool type and delivery terms. Buyers who know how the figure is built can compare offers on a like-for-like basis instead of comparing headline tonnage prices. Four components make up almost every quotation: the metal value of the contained zinc, the grade premium, the drawing and surface treatment cost, and packaging plus logistics.
Metal value - the price of the zinc content, referenced to the published zinc price for the agreed delivery period.
Grade premium - the extra cost of holding very low lead, iron and cadmium levels.
Processing cost - melting, casting, wire drawing, surface cleaning and inspection.
Packaging and logistics - drum or spool type, coil weight and freight to the delivery point.
Metal Value: Zinc Content and Purity Grade
Zinc wire is a high-purity product. Because the wire contains 99.99% zinc or more, the metal value dominates the quotation: a 99.99% grade carries almost one tonne of recoverable zinc in every tonne of wire, so the tonnage of wire and the tonnage of metal are effectively the same quantity. That is why zinc wire price tracks the published zinc price closely, usually with the quotation period agreed in the contract rather than with the day of shipment.
Refined zinc grades are defined in ASTM B6, which covers the range from Prime Western to Special High Grade with a minimum of 99.990% zinc, and higher-purity material above it. Thermal spray wire itself is specified in ASTM B833, and ISO 14919 covers wires for thermal spraying and the associated delivery conditions.
| Grade | Zinc content | Typical wire application | Effect on price |
|---|---|---|---|
| Special High Grade | 99.99% | General thermal spray coating | Baseline grade premium |
| High purity | 99.995% | High-performance corrosion protection | Higher premium; tighter impurity control and extra inspection |
Higher purity is bought for a reason: lower lead and cadmium improve the consistency of the sprayed coating and reduce fume during spraying, which matters in enclosed spraying booths.
Processing, Diameter and Packaging Cost
Drawing is the second-largest cost element after the metal. Smaller diameters need more drawing passes, finer dies and more careful spooling, so the conversion cost per ton rises as the wire gets thinner.
| Diameter | Typical application | Processing note |
|---|---|---|
| 0.6 – 1.0 mm | Precision coating work | Fine drawing passes, highest conversion cost per ton |
| 1.2 – 2.0 mm | General thermal spraying | Standard route, the most common size range |
| 2.5 – 4.8 mm | Industrial-scale coating | Fewer passes, lower conversion cost per ton |
Energy prices and environmental compliance costs feed into melting, casting and cleaning. Packaging also moves the price: paper drums, plastic spools and steel drums differ in cost and in the usable wire length they carry, so a price per ton should always be compared at equal coil weight and equal spool type.
Typical Zinc Wire Specifications
| Parameter | Specification |
|---|---|
| Zinc content | 99.99% – 99.995% |
| Diameter | 0.6 – 4.80 mm |
| Specific gravity | 7.13 ± 0.1 g/cm³ |
| Melting point | 419.5 ± 1 °C |
| Electrical resistivity at 20 °C | ≤ 70 mΩ·mm²/m |
| Tensile strength | 95 – 135 N/mm² |
| Elongation on 100 mm | ≥ 20 – 30% |
Tensile strength and elongation matter as much as the zinc figure: a wire that is too brittle breaks at the contact tip of the spray gun, and a wire that is too soft feeds unevenly and produces an erratic arc. Diameters, spool sizes and coil weights are normally customised to the spraying equipment in use.
Zinc Wire vs Zinc-Aluminum Wire: Price and Life-Cycle Cost
Zinc-aluminum wire, commonly Zn/Al 85/15 or 90/10, is specified in ASTM B833 as an alloy wire for thermal spraying. The alloy carries a higher price per ton than plain zinc wire because of the aluminum addition and the tighter melting and casting control it needs. The higher purchase price is offset by longer coating life in aggressive environments.
| Property | Zinc wire | Zinc-aluminum wire |
|---|---|---|
| Composition | ≥ 99.99% Zn | Zn-Al alloy, commonly 85/15 or 90/10 |
| Protection mechanism | Zinc sacrificial protection | Sacrificial protection plus aluminum oxide barrier |
| Corrosion resistance | Excellent | Superior in harsh environments |
| Coating durability | Good | Longer service life |
| Marine environment | Good | Excellent |
| Initial cost per ton | Lower | Higher |
| Life-cycle cost | Suited to normal environments | Better for long-term protection |
On a life-cycle basis, plain zinc wire usually gives the lower cost per square metre for indoor, normal outdoor and light industrial exposure, while zinc-aluminum wire gives the lower cost per year of protection for coastal, marine, offshore and chemical plant exposure, where access for re-coating is expensive and downtime is costly. The decision therefore depends on the environment and the maintenance interval, not on the headline price per ton alone.
How to Compare Zinc Wire Quotations
Fix the grade: ask for the zinc content and the lead, iron and cadmium limits, not the zinc figure alone.
Fix the diameter and its tolerance, since a tolerance towards the lower limit reduces the coating weight deposited per metre of wire.
Fix coil weight, spool type and packaging, and ask for the net weight rather than the gross weight of the drum.
Confirm the pricing basis: which published zinc price, which quotation period, and whether the conversion premium is fixed or floating.
Request the quality documents: mill test certificate, chemical analysis report and product specification sheet.
Compare at equal delivery terms, because export packing and freight can change the landed price per ton appreciably.
Frequently Asked Questions
Q: What is the largest single cost in zinc wire price per ton?
The metal value of the zinc content. Because the wire is 99.99% zinc or higher, the published zinc price is the dominant component and the drawing, inspection and packaging costs are added on top of it.
Q: Does higher zinc purity always cost more per ton?
Within the same diameter, yes. Material at 99.995% needs better raw material selection, stricter impurity control and additional inspection, so its conversion premium is higher than that of 99.99% wire.
Q: Which wire diameter is the most economical?
Larger diameters in the 2.5 to 4.8 mm range carry a lower conversion cost per ton because fewer drawing passes are needed, but they suit only equipment able to work at a high deposition rate.
Q: Is zinc-aluminum wire more expensive per ton than plain zinc wire?
Yes. The aluminum addition and the alloy melting control raise the price per ton, but the coating lasts longer in salt-spray, coastal and marine exposure, which reduces the cost per year of protection.
Q: How can a buyer check that the quoted grade is genuine?
Compare the chemical analysis report and the mill test certificate against ASTM B833 and the ordered grade, and check the lead, iron and cadmium limits rather than accepting a single zinc figure on the offer.
Q: Do exchange rates and freight affect the price per ton?
They do. Currency movement changes the metal value expressed in local terms, and packing plus freight add a per-ton cost that varies with destination, container loading and delivery terms.
