Views: 0 Author: Site Editor Publish Time: 2025-07-11 Origin: Site
Commemorative coins come in a variety of materials, depending on their issuing authority, functional purpose (circulation/collection), value attributes, and cost budget. However, globally speaking, the following materials are the most common:
Gold: Used to make high-value commemorative
coins such as zodiac gold coins and commemorative gold coins for major events
Silver: Commonly used in themed commemorative coins such as Olympic Games and cultural heritage series, with some employing ‘gold-plated silver’工艺
Copper Alloy: Can mimic the appearance of precious metals like gold and silver, suitable for mass-market commemorative coins (e.g., zodiac commemorative badges, anniversary commemorative coins), offering both texture and corrosion resistance
Iron Alloy: The lowest-cost material, primarily used for mass-produced low-cost commemorative coins (e.g., exhibition gifts, event souvenirs)
Aluminium alloy: lightweight material (e.g. colour-coated aluminium, aluminium-magnesium alloy), suitable for portable commemorative coins (e.g. badge-style commemorative coins), and can achieve rich colours through coating, often used for cultural and creative, campus, and sports-themed commemorative coins.
Colour-coated aluminium has a density of only 2.7 g/cm³, far lower than copper (8.9 g/cm³) and silver (10.5 g/cm³), resulting in lighter commemorative coins that are suitable for bulk carrying, mailing, or wearing (e.g., badge-style commemorative coins).
The coating on colour-coated aluminium can be customised to any Pantone colour code, accurately reproducing the pattern details of the commemorative theme (such as logos, portraits, and scene colours). Compared to traditional single-colour electroplating (gold, silver, nickel) on metal commemorative coins, it offers stronger visual appeal, making it particularly suitable for cultural and creative, sports events, and school anniversary commemorative themes.
Colour-coated aluminium raw materials are cheaper than precious metals like copper and silver, and the coating process is well-established, making it suitable for small to medium-sized custom orders (e.g. thousands to tens of thousands of pieces), lowering the barrier to entry for commemorative coin production.
Aluminium alloy types: Preferably 1060, 3003, etc., as these alloys have good ductility and are easy to stamp into shape, making them suitable for coin relief processing.
Typically, colour-coated aluminium coils with a thickness of 0.3–1 mm are selected. Prioritise models with strong coating adhesion (e.g., polyester coating) and scratch resistance to prevent pattern wear over time.
Stamping/Moulding: Suitable for simple geometric patterns or relief effects. Ensure the coating does not peel off during stamping (pre-test coating flexibility).
Laser Engraving: Precisely engraves intricate patterns (e.g., text, lines), revealing the aluminium substrate's natural colour after engraving to create a ‘coloured background + metallic pattern’ contrast effect.
Secondary Printing: Applies UV ink over the coloured aluminium surface to enhance pattern depth, but must ensure compatibility with the original coating (non-soluble, non-peeling).
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