Metal vs Plastic vs Zinc Alloy vs Corozo: How to Choose

The Four Material Lines

We run all four in-house, which means we can compare them honestly rather than steering a buyer towards one:

Metal Buttons

Choose metal when durability and perceived quality matter more than unit cost, or when the garment is washed hard.

• Strengths. Highest durability and the best perceived quality. Holds a crisp logo. Survives repeated machine washing when plated correctly. Recyclable.
• Weaknesses. Heaviest option; adds to shipping weight. Can tarnish or corrode if the plating is too thin for the care label. Nickel release must be managed for skin-contact parts.
• Design constraint. Metal is best for solid shapes and shank formats. Fine surface detail is achievable, but deep undercuts and complex internal geometry drive tooling cost up sharply.
• Compliance note. Needs 1.0mm needle detection (ferrous contamination risk), a nickel-release test for skin-contact parts, and REACH SVHC documentation.

Plastic Buttons

Choose plastic when cost per piece and light weight are the priority, or when the design needs colour variety and fine surface detail.

• Strengths. Lowest unit cost of the four. Light, so it keeps garment weight and freight down. Widest colour range — can be dyed to match any Pantone reference. Fine relief detail is moulded cheaply.
• Weaknesses. Lower durability than metal. Urea and some polyester grades can be brittle under impact. Perceived as less premium, which matters on high-end garments.
• Design constraint. Very flexible — engraved logos, coloured engraving, two-shot moulding and pearl or marbled effects are all practical.
• Compliance note. Azo dyes and formaldehyde are the watch items on plastic, along with the general OEKO-TEX requirement. Needle detection is not normally required unless the part contains a metal insert.

Zinc Alloy Hardware

Choose zinc alloy when the part is structural rather than decorative — it has to hold, buckle or fasten something.

• Strengths. Die-casting allows complex three-dimensional shapes that would be expensive or impossible to stamp from sheet metal. High strength for its section. Excellent surface finish after polishing and plating.
• Weaknesses. Heavier than sheet-metal equivalents. Longer lead time (die-casting tooling takes longer to cut) and higher MOQ (2,000 pieces per style).
• Design constraint. This is the right process for buckles, adjusters, hooks, D-rings and shapely decorative hardware. Wall thickness has to respect die-casting rules, so very thin sections in the design may need to be thickened.
• Compliance note. As per metal — needle detection, and nickel-release testing where the part contacts skin.

Natural Buttons

Choose natural when the collection has a sustainability story, or the garment sits in a premium or heritage segment.

• Strengths. Genuine natural material and a strong sustainability narrative. Corozo takes dye well and is uniform enough to work at volume. Shell has a characteristic iridescence that cannot be replicated in plastic. Horn is classic on menswear tailoring.
• Weaknesses. Natural variation is inherent, not a defect — grain, shade and thickness vary from piece to piece. Lower impact resistance than metal or high-grade plastic. Higher breakage rate on thin-walled designs.
• Design constraint. Works best on classic round, flat and shank formats. Very fine engraving does not reproduce as crisply as on plastic.
• Compliance note. Natural materials need their own inspection step for foreign matter and stones in the raw stock, in addition to the standard OEKO-TEX and azo-dye testing.

Choosing by Garment Type

Cost, Weight and MOQ Side by Side

The three numbers buyers compare most often, as we quote them:

Mixed Material Programmes

Many garments use more than one material on the same style: a metal shank button on the front, plastic buttons on the cuffs, and a zinc alloy adjuster on the hem. This is normal and we quote it as a single programme — but two points are worth flagging early:

• Different processes carry different tolerance ranges, so "the same 20L" in two materials will not be dimensionally identical. If that matters, say so and we will confirm the tolerance on both.
• Colour matching across materials is approximate. A gold-plated metal button and a gold-dyed plastic button will be close in tone but not identical under all lighting. Apparel buyers usually accept this; if your customer will not, we will say so before sampling.

Quick Answers

Which button material is cheapest?

Plastic, generally. Urea and polyester buttons cost the least per piece, with the lowest MOQ and the widest colour range. Metal and zinc alloy cost more because of raw material and process.

What is zinc alloy used for?

Structural hardware — buckles, rivets, adjusters, hooks and D-rings. Die-casting produces complex 3D shapes that are difficult or uneconomical to stamp from sheet metal.

Are corozo buttons durable?

Reasonably, for their weight. Corozo (vegetable ivory) resists impact better than shell or horn and is uniform enough for volume production, but it is not as tough as metal and thin-walled designs can chip.

Can I mix materials on one garment?

Yes, and it is common. Note that different processes have different dimensional tolerances and that colour matching across materials is approximate, not exact.

Which material is best for a sustainable collection?

Natural materials — corozo, shell and horn — carry the strongest sustainability story. Recycled metal is also defensible. The material choice matters less than being able to document where the raw stock comes from.