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Composite manhole covers are made of fiber-reinforced thermosetting composite materials based on unsaturated polyester resin, also known as bulk molding compound (DMC). [1] This type of manhole cover is manufactured using high-temperature and high-pressure one-step compression molding technology. It has a high degree of polymerization and density, exhibits good impact resistance and tensile strength, and is also wear-resistant, corrosion-resistant, and rust-resistant.
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| Parameter | Specification |
|---|---|
| Material Composition | Fiberglass Reinforced Polymer (FRP) / SMC (Sheet Molding Compound) |
| Reinforcement Fiber | E-glass fiber (content: 25-30%) |
| Resin Matrix | Unsaturated polyester resin or vinyl ester resin |
| Fillers/Additives | Calcium carbonate, UV stabilizers, flame retardants |
| Dimensions | – Diameter: 600/750/800 mm (customizable) – Thickness: 50-100 mm |
| Shape | Round/Rectangular (standard or custom designs) |
| Load Capacity | – Class A: 15-25 kN (pedestrian) – Class B: 90-400 kN (vehicular traffic) |
| Weight | 30-70 kg (depending on size and load class) |
| Temperature Resistance | – Operating range: -40°C to +120°C |
| Corrosion Resistance | Resistant to acids, alkalis, salts, and chemicals |
| UV Resistance | UV-stabilized coating for outdoor durability |
| Flame Retardancy | UL94 V-0 compliant (self-extinguishing) |
| Anti-Slip Surface | Textured pattern (diamond/grating) or grit coating (skid resistance ≥65 BPN) |
| Color | Standard: Black/Gray (custom colors available) |
| Installation Method | Embedded frame or bolt-fastened |
| Design Standards | EN 124, ASTM C923, GB/T 23858-2009 |
| Testing Standards | – Compression test (ISO 604) – Flexural strength (ISO 178) – Impact test |
| Service Life | 20-30 years (depending on environmental conditions) |
| Certifications | ISO 9001, ISO 14001, CE (optional) |
| Customization Options | – Logo embossing – Locking mechanisms – Adjustable load classes |
Shandong Baowu Steel Group Co., Ltd. located in Shandong, we have convenient transportation.our company is a large-scale enterprise specializing in the production of seamless steel pipes, welded steel pipes, stainless steel pipes and stainless steel products. We mainly produce including stainless steel plates/coils and profiles, Steel plate, alloy steel plate, wear-resistant steel plate,Carbon plate, square tube, galvanized tube, non-ferrous metal, PPGI and PPGL and other materials. Our company also has cooperative factories, like TPCO, TISCO, ZPSS, Tianjin Iron and Steel Group, HBIS Group, and Steel, Shandong Iron and Steel Group.We have rich experience in foreign trade and have established long-term cooperative relations with many well-known foreign companies.
We are a factory as well as a professional manufacturer established for more than 20 years and export over 15 years.
Can provide small samples for free. Customized sample takes 5-7 days.
Small trial order takes 5-7 days. Container order need 15-20 days.
Cover with PE film , wrap with waterproof paper, pack with wooden plate,belt by steel strip, fasten on pallet.
All products we supply is primary as you need, Our company is certificated to CE, and every product will be tested for 4-5processes. We welcome customers or the third party inspection agencies to come to our factory for inspection.
Usually 30% deposit by TT in advance and balance against copy pf BL or L/C at sight.
Become a leader in the global steel industry and jointly create a high-quality steel ecosystem. A steel company specializing in the production and sales of steel products.
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