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Manufactured with aerospace-grade unsaturated polyester resin and chopped glass fiber, this 500×500mm square SMC manhole cover is built for telecom infrastructure and commercial procurement scenarios. Its performance is tested against multiple international and domestic standards, supporting long-term operation in complex environmental conditions.
Formed with aerospace-grade unsaturated polyester resin and chopped glass fiber, the product increases molecular structure compactness by 60% compared with traditional SMC materials. Tested by the National Chemical Building Materials Testing Center, it operates without warping deformation under temperatures from -40°C to 120°C, with a thermal expansion coefficient 1/8 that of metal products.
With a specialized anti-hydrolysis formula, the manhole cover resists acid rain erosion, with a tensile strength retention rate of ≥ 95% in pH 3-11 corrosive environments. It has passed the ASTM G154 accelerated aging test, with 88% impact strength retention after 20 years of simulated natural aging.
Nano-scale titanium dioxide (TiO₂) ultraviolet absorber is integrated into the material to form a permanent light shielding layer, with 2000kLy solar radiation tolerance and > 99.8% UV-A/B band barrier rate.
The product uses a double composite protection process: anti-UV masterbatch in the substrate plus a surface nano-ceramic coating. Its color fastness reaches Grade 5 per GB/T250-2008, with a color difference Delta E < 1.5 after 5000 hours of xenon lamp aging test. Field-verified across high UV, high-humidity and extreme cold climates, the material maintains a Level 0 surface chalking grade.
The honeycomb bionic reinforcement structure increases load distribution efficiency by 40%. This structural design has passed EN124 D400 level testing (40 tons load), and the product weighs 65% less than same-size cast iron manhole covers.
Embedded 316L stainless steel inserts are co-cured with the substrate, reaching 25MPa interfacial shear strength and avoiding load capacity decay caused by bolt corrosion. In dynamic fatigue tests, residual deformation is < 0.2mm after 1 million 75kN loading cycles, complying with GB/T23858-2009.
CODE | LOAD | O | D | F | h | H | WEIGHT |
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SS500A | A15 | 450x450 | 500x500 | 600x600 | 30 | 45 | 12.5 KG |
SS500B | B125 | 450x450 | 500x500 | 600x600 | 30 | 45 | 18.5 KG |
This SMC manhole cover series fits a wide range of industrial applications, including telecom pipeline facilities, urban municipal construction, road maintenance, public park facilities and rail transit projects. It meets the low-maintenance, long-service-life demands of commercial procurement for infrastructure projects.
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The product has been adopted in global infrastructure projects:
Dubai Municipal Council projects: The manhole covers show no deformation or cracking under 50°C ambient temperature and strong UV exposure, meeting local application standards.
Singapore Metro Group rail projects: The product has passed SGS conductivity testing with a resistance value > 1×10^12 Ω, with electrical insulation properties supporting safe use in track zones.
Standard models come with A15 and B125 load ratings as listed in the specification table. Custom configurations with load ratings up to EN124 D400 (40 tons) are available based on project-specific requirements.
The product supports stable operation across -40°C to 120°C, with a thermal expansion coefficient far lower than metal manhole covers.
Standard products have a 30-day lead time. For customized orders, the estimated lead time will be provided after order details are confirmed.
Qingdao Elite New Materials Co., Ltd. focuses on R&D, production and sales of SMC manhole cover products, with exports to markets worldwide. We support customized solutions for enterprise customers. Reach out to our team for consultation or order inquiries.
