What is Class 3 galvanization for wire?

Class 3 galvanization is a thick zinc coating that enhances a wire’s resistance to corrosion and rust. A wire’s galvanization class refers to the amount or thickness of the zinc it receives during the galvanization process.

Baling wire will rust, so galvanization is used to increase its longevity by giving the steel a protective coating that will shield it from harsh and corrosive conditions. Galvanized wire is often used to bale recyclables that will be stored outdoors, as pasture fencing, and on vineyards and orchards as trellising.

Even galvanized wire will eventually rust. Its lifespan depends on its galvanization class and the corrosiveness of its environment.

The difference between Class 1 and Class 3 galvanization

The difference between Class 1 and Class 3 galvanization has to do with the thickness of the wire’s protective zinc coating.

  • Class 1 galvanized wire features a thinner zinc coating of 0.28 ounces per square foot and provides basic protection, but it tends to rust after 2–12 years depending on the environment. In coastal areas, Class 1 coatings fail even sooner due to saltwater corrosion. It is often used for barbed wire fencing.
  • Class 3 galvanized wire offers a premium zinc coating (nearly three times as thick as Class 1) that uses 0.80 ounces of zinc per square foot. This wire coating features a higher degree of protection, providing a lifespan of 13–30 years. Class 3 galvanized wire is more expensive up front, but it is much more long-lasting. Class 3 galvanization is our most rust resistant wire coating, the ideal choice for harsh environments.

Benefits of galvanized wire

Compared to regular baling wire, galvanized wire provides an extra level of resilience and longevity. Some of the benefits of galvanized wire include:

  • Versatility. Galvanized wire is used across a range of industries, including agriculture, construction, and recycling.
  • Corrosion resistance. The zinc layer acts as a sacrificial anode, protecting the underlying steel from corrosion.
  • Durability. Galvanized wire also provides some extra abrasion-resistance and durability.
  • Recyclability. As with standard baling wire, galvanized wire is recyclable.
  • Longevity. Class 3 galvanized wire has a lifespan of 13–30 years, and in some cases even longer.

Our hot-dip galvanizing process

Our hot-dip galvanization process involves these 7 steps:

  1. Surface preparation. We clean the wire to prepare it for the zinc application.
  2. Pickling. We bathe the wire in an acidic solution, stripping impurities for an optimal foundation.
  3. Fluxing. We then submerge the wire in a zinc chloride solution, which prevents oxidation for a smooth zinc coverage.
  4. Molten zinc bath. The wire then enters a 450°C zinc bath.
  5. Alloy formation. Sustained heat melds the zinc and wire, creating durable galvanic layers.
  6. Extraction. We slowly extract the wire so excess zinc drips off, leaving an even coating.
  7. Quenching. The wire enters a cooling bath of water or a quenching solution, solidifying the protective zinc layers

Our Class 3 galvanized wire

At Baling Wire Direct, we offer Class 3 galvanization on all of our galvanized wire products, including: 

  • Single and double loop bale ties. These are ideal for manual vertical balers of recyclables that can be stored outside, such as rubber, plastic, and aluminum cans.
  • Regular galvanized wire. Often used for fencing and other non-baling applications.

High-tensile wire. This wire is commonly used in high-volume two-ram automatic balers. Its increased tensile strength allows it to bale dense, heavy-duty materials, and its corrosion resistance is great for outdoor usage.

Baling wire products we offer

Baling Wire Direct sells the following high-quality baling wire products.

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