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No. | Comparison Dimension | SMC Manhole Cover (Proposed for Hynds) |
Cast Iron Manhole Cover (Current Main Product) |
Summary |
1 | Strength & Load-Bearing Capacity | - Meets the needs of most municipal, commercial and medium-to-high load scenarios; - More in-depth testing is required in extreme overload (such as airport runways and facilities). |
- High reliability in high-pressure and heavy-load environments; - Brittle cracks may occur if the casting process or material grade is not good. |
In conventional load scenarios, SMC performance is sufficient; in heavy-load extreme occasions, cast iron still has advantages or upgraded SMC can be considered. |
2 | Weight & Installation | - Lightweight, easy to install, saving labor and transportation costs; - Market awareness is still low, and corresponding training or usage guidance is required. |
- Heavy weight, good stability, not easy to shift; - More manpower or machinery is required, and the installation cost is relatively high. |
SMC is more suitable for projects with insufficient manpower, tight construction schedule or limited installation conditions; cast iron can still be completed quickly when construction resources are sufficient. |
3 | Anti-Theft & Safety | - No metal recycling value, the risk of theft is almost zero; - Special anti-theft design can be added to further improve safety. |
- Has metal recycling value, theft incidents are frequent; - Anti-theft locks or alarm devices need to be installed separately, adding extra costs. |
SMC is more effective in areas with high incidence of theft and projects with high public safety requirements. |
4 | Corrosion Resistance | - Resistant to acid, alkali, salt spray and general chemical corrosion, the surface does not rust, and less maintenance in the later stage; | - Long service life in ordinary municipal environments; - Coastal and chemical zones are prone to rust and require continuous anti-corrosion and maintenance. |
In chemical, coastal, and high-salt-alkali areas, SMC saves more maintenance costs; cast iron needs to strengthen anti-corrosion treatment. |