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FRP/composite manhole covers use glass fiber and its products (glass cloth, tape, felt, yarn, etc.) as reinforcing materials and synthetic resin as matrix material. They are mainly composed of unsaturated polyester resin, filler, initiator, thickener, low shrinkage additive, film forming agent, pigment and reinforcing material.
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| Parameter | Details |
|---|---|
| Material Composition | |
| – Matrix Material | Unsaturated polyester resin / Epoxy resin |
| – Reinforcement Material | Continuous or chopped glass fiber |
| – Filler Material | Quartz sand, Calcium carbonate |
| – Additives | UV stabilizers, Flame retardants, Pigments, Anti-static agents |
| Structural Design | Multi-layer composite (dense surface, reinforced core, supportive base) |
| Mechanical Properties | |
| – Load Capacity | A15 (Pedestrian) to F900 (Airports/Ports) (EN 124 or equivalent standards) |
| – Compressive Strength | ≥300 MPa |
| – Flexural Strength | ≥150 MPa |
| – Impact Resistance | High (ASTM D256 standard) |
| Physical Properties | |
| – Weight | 20–30 kg (vs. 50–100 kg for cast iron) |
| – Temperature Resistance | -50°C to +150°C (dependent on resin type) |
| – Flame Retardancy | UL94 V0 (optional) |
| Functional Features | |
| – Corrosion Resistance | Resistant to acids, alkalis, salts, oils, and solvents |
| – Anti-Theft Design | Non-recyclable material, embedded locking mechanisms |
| – Electrical Insulation | Non-conductive (suitable for power/telecom applications) |
| – Anti-Slip Surface | Textured or patterned design (optional) |
| Durability & Maintenance | |
| – Service Life | 20+ years (with UV-resistant coating) |
| – Maintenance | Low (periodic cleaning and inspection) |
| Environmental Compliance | |
| – Recyclability | Partially recyclable |
| – Standards | GB/T 23858-2009, EN 124, ASTM C581 |
| Customization Options | |
| – Color | Customizable (RAL/ Pantone codes) |
| – Surface Texture | Anti-slip, camouflage (e.g., faux stone or grass) |
| – Size | Standard: 600×600 mm, 700×700 mm; Custom sizes available |
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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