Compared to traditional cast-iron manhole covers, composite manhole covers offer the following advantages in practical use:
- Strong theft resistance: The material has no scrap value and contains little to no metal reinforcement; the high cost of theft acts as a natural deterrent.
- Corrosion and rust resistance: Suitable for environments exposed to corrosive agents such as acids, alkalis, salts, and sewage; typically boasts a service life of 15–20 years.
- Lightweight: Weighs only one-third to one-quarter of cast-iron covers, facilitating transport, installation, and emergency repairs while reducing physical strain on workers.
- High load-bearing capacity: High-strength composite covers can withstand vehicle loads exceeding 40 to 60 tons, meeting national standards for manhole covers.
- Aesthetic appeal and low noise: Surfaces can be designed with various colors and patterns; they generate minimal noise when driven over and offer good slip resistance.
- Excellent insulation: Free from metal additives, providing genuine electrical insulation; suitable for applications in power and telecommunications sectors.
