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The 690mm seismic-cushioning SMC manhole cover is a high-performance infrastructure solution developed by Qingdao Elite New Materials Co., Ltd., a professional manufacturer specializing in R&D, production and sales of SMC composite products since 2019. Designed for urban road construction, municipal maintenance and heavy-traffic areas, this manhole cover integrates advanced composite technology with seismic and noise reduction features, complying with both domestic and international quality standards. Our products have been exported to the United States, Australia, Germany, the United Kingdom, India, South Africa and other countries, earning high recognition from global industrial clients and infrastructure project partners.
Adopting multi-layer reinforcement technology combining glass fiber three-dimensional mesh and mineral filler composite reinforcement, our SMC manhole cover achieves exceptional mechanical properties. Its compressive strength reaches D400 level according to EN 124 standard, and bending strength is no less than 85MPa as tested under GB/T 23657. This robust structure ensures long-term durability even under continuous vehicle loads, reducing maintenance frequency and replacement costs.
Our product series covers all load classes from A15 to F900 in accordance with CJ/T 211-2005 standard, making it suitable for sidewalks, residential areas, main roads, highways and other diverse applications. We also provide customized load-bearing solutions to meet extreme overload requirements, such as airport runways and port terminals, ensuring reliable performance in the most demanding environments.
Compared with traditional cast iron manhole covers of the same specification, our SMC manhole cover has only 1/4 of the weight per unit area. A typical 600mm round manhole cover weighs only 18kg, and the 690mm series ranges from 30.8kg to 53.0kg depending on load class. This lightweight design reduces transportation energy consumption by 65% and increases installation efficiency by 300%, supporting manual handling without mechanical assistance as required by DIN 124-1, significantly saving labor and construction time.
With an elastic modulus of up to 12GPa, the SMC manhole cover effectively absorbs vehicle shock and vibration, reducing damage to underground infrastructure and extending the service life of road surfaces. The elastic contact interface also achieves multi-dimensional noise reduction, with vehicle passing noise no more than 45dB(A), which is 60% lower than that of metal manhole covers, meeting the requirements of GB 3096 for environmental noise control in residential and urban areas.
CODE | LOAD CLASS | Clear Opening (O) (mm) | Outer Diameter (D) (mm) | Flange Diameter (F) (mm) | Cover Thickness (h) (mm) | Total Height (H) (mm) | Weight |
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MR690A | A15 | 600 | 690 | 805 | 50 | 100 | 30.8 KG |
MR690C | C250 | 600 | 690 | 805 | 50 | 100 | 46.0 KG |
MR690D | D400 | 600 | 690 | 805 | 50 | 100 | 53.0 KG |
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We operate an integrated production and sales model that eliminates intermediaries, enabling quick response to customer order requirements and shortening delivery cycles. Standard products can be shipped within 30 days, and customized orders will be provided with an estimated lead time immediately after technical confirmation. Our autonomous production scheduling system allows flexible capacity adjustments based on order priorities, avoiding delays caused by reliance on external suppliers.
In addition to standard products, we offer comprehensive customization services for global construction enterprises. Whether you need manhole covers with special load ratings, sizes, colors or logos, our R&D team will develop tailored solutions to meet your specific project needs. We have extensive experience in providing customized products for airport runways, port terminals and other heavy-duty infrastructure projects.
Our SMC manhole covers are trusted by global industry leaders, including BASF which has adopted our products for its site in Germany. We adhere to strict quality control standards throughout the production process, using advanced equipment and technology to ensure consistent product performance. We are also committed to environmental and social responsibility, using eco-friendly SMC/BMC materials to minimize carbon emissions throughout the product lifecycle, and actively supporting educational projects and environmental initiatives.
The 690mm series offers three standard load classes: A15 for light-traffic areas such as sidewalks and pedestrian zones, C250 for residential streets and parking lots, and D400 for main roads and highways. We can also customize higher load classes up to F900 for heavy-duty applications.
SMC manhole covers are 75% lighter than cast iron covers, reducing transportation and installation costs. They also feature excellent seismic cushioning and noise reduction properties, are corrosion-resistant and theft-proof, and have a longer service life with lower maintenance requirements.
Standard 690mm SMC manhole covers can be shipped within 30 days of order confirmation. For customized orders, the lead time will be determined based on the complexity of the requirements and will be provided to you in writing after technical evaluation.
Yes, we have extensive experience in developing customized high-load manhole covers for extreme overload scenarios. Our products can be engineered to meet the specific requirements of airport runways, port terminals and other heavy-duty infrastructure projects.
If you are looking for reliable and high-performance SMC manhole covers for your infrastructure projects, please feel free to contact us for detailed quotations and technical support. We look forward to partnering with you to advance global infrastructure construction.
