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Classification of Artistic Manhole Covers
The first type is the colored manhole cover.
The second type is the copper-faced manhole cover.
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First, let’s talk about the first type, the colored manhole cover. Colored manhole covers are usually made by applying outdoor wear-resistant resin, fluorocarbon and other materials on the surface of cast iron manhole covers.
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Let’s talk about the second type, the copper-faced manhole cover.
There are four methods to make copper surface manhole covers with the effects of bronze, brass or red copper.
1. Casting bronze or red copper requires a large amount of copper and is relatively expensive, but it is suitable for long-term use.
2. Using cast iron as the load-bearing base and placing an 8-millimeter-thick embossed copper plate in the surface grooves, the two materials are physically combined to form a complete finished manhole cover. This method is suitable for small batches and can be used for a long time.
3. Casting patterns and characters with cast iron and then covering the surface with a 0.5 – 1-millimeter-thick layer of bronze, brass or red copper by laser. This can reduce production costs. It can be used for 6-8 years without wearing out, and even if it does wear out, it still looks good and is suitable for long-term use.
4. Casting patterns and characters with cast iron and then electroplating a 0.1-millimeter-thick layer of bronze, brass or red copper on the surface to reduce production costs. It can be used for one year before wearing out, but it is very cheap and not suitable for long-term use.
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