1. Material and Structure
Iron plate flanges: Made of pure iron or ordinary cast iron, with no additional protective coating on the surface, and the structure is a single metal layer.
Plastic-coated flanges: Use iron or steel as the base, with a corrosion-resistant coating (such as polyethylene (PE), epoxy resin) on the surface, belonging to a composite structure of "metal base + protective coating".
2. Corrosion Resistance
Iron plate flanges: Prone to corrosion by water, air, etc. When used in humid environments such as water supply for a long time, they are easy to rust, affecting service life.
Plastic-coated flanges: The coating can isolate the base metal from corrosive media, greatly improving rust resistance and chemical corrosion resistance, suitable for complex water quality or humid environments.
3. Application Scenarios
Iron plate flanges: Mostly used in simple pipeline systems that are dry and non-corrosive, or temporary projects with low requirements for service life.
Plastic-coated flanges: Widely used in pipeline systems with humidity or corrosion risks such as water supply, sewage treatment, and chemical industry, especially suitable for long-term buried scenarios or those in contact with corrosive water quality.
4. Service Life and Maintenance
Iron plate flanges: Short service life , requiring regular rust removal and paint brushing for maintenance, with high maintenance costs.
Plastic-coated flanges: No frequent maintenance is needed when the coating is intact, and the comprehensive use cost is lower.
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