Sheet moulding compound upgrades urban manhole cover infrastructure

2026/08/27 | View:5

As global urban renewal and green infrastructure advance, traditional cast iron and cement manhole covers have long suffered from theft, corrosion, high maintenance costs, and traffic hazards. SMC (Sheet Moulding Compound) manhole covers overcome these shortcomings with high strength, anti-theft, corrosion resistance, lightweight, and low-carbon benefits. They are now the optimal solution for municipal roads, industrial parks, and pipe networks, driving iterative upgrades in urban infrastructure.

1.Pain Points of Traditional Urban Infrastructure

Traditional cast iron and cement manhole covers are common urban hazards. Metal covers are often stolen for scrap value, creating road pits that cause accidents and injuries. In sewage, chemical, or coastal environments, they rust, crack, sink, or loosen, requiring frequent repairs. Repeated maintenance drives up labor, material, and road closure costs, making full-cycle municipal expenses high. Aging infrastructure has become a key constraint on urban quality.

2.SMC Process Delivers High-Performance Infrastructure

Unlike traditional casting, SMC manhole covers use high-temperature and high-pressure compression molding, which is a milestone innovation in the field of composite materials in civil engineering.

The following are the main performance advantages of SMC manhole covers:

*High-Strength Composite Material

SMC outperforms metal and cement with weather/UV/temperature resistance, long-term immersion stability, and no deformation, cracking, or fading.

*Complies with International & National Standards

Meets EN124 load-bearing standards and national municipal specifications, offering excellent compression, impact, and bending resistance.

*Seamless One-Piece Sealed Structure

Integrated molding eliminates gaps, ensuring tight sealing that prevents water backflow, odor escape, and insect entry.

3.Lightweight Design Cuts Costs, Boosts Efficiency

SMC manhole covers suit drainage, gas, power, and communication well covers on urban roads. Lightweight design enables manual handling and fast installation, shortening construction periods, reducing site risks, and saving labor and machinery costs. In transport and bulk delivery, light weight cuts sea and land logistics costs, supports stable mass production and rapid delivery, and meets procurement needs for large-scale urban renewal and overseas infrastructure projects.

4.Green SMC Supports Sustainable Urban Growth

Unlike energy-intensive cast iron, SMC offers low production energy, no heavy metals, and no pollution, fully complying with RoHS and REACH.

SMC manhole covers last over 20 years, sharply reducing replacement frequency, construction waste, and resource consumption. Chemically stable, they release no harmful substances in sewage or soil contact, aligning with sponge city and water protection projects, and fulfilling sustainable green infrastructure principles.

5.Union SMC recommendation for manhole cover

SMC code	Bearing weight for finished manhole cover	Main Application
6002 series	12.5 tons	Manhole covers for gas, power, communication, lawn, etc
6006 series	20 tons	Manhole covers on non main roads and auxiliary roads
6005 series	40 tons	Manhole covers on urban arterial road