What are the shortcomings of Ductile iron manhole round covers?

Ductile iron manhole round covers, usually referring to the cover plates made of glass fiber reinforced plastic (FRP) or other synthetic resin materials, are widely used in many industries, such as drainage systems, walkways, parks, etc. However, Ductile iron manhole round covers also have some shortcomings. The following are some main disadvantages:

Mechanical properties

1. Limited bearing capacity: Compared with metal cover plates, the bearing capacity of Ductile iron manhole round covers is relatively low and is not suitable for withstanding heavy loads.

2. Poor impact resistance: The impact resistance of resin materials is not as good as that of metals and is easy to break when strongly impacted.

Thermal properties

3. Poor heat resistance: Resin materials are easy to deform or even melt in a high-temperature environment.

Environmental adaptability

4. Aging: When exposed to sunlight for a long time, Ductile iron manhole round covers may have problems such as aging, discoloration and strength reduction.

5. Chemical resistance: Some chemical substances, such as strong acids and strong alkalis, may corrode resin materials.

Maintenance

6. Maintenance requirements: Although Ductile iron manhole round covers require less maintenance, they may need regular inspection and replacement in special environments.

Cost

7. Cost issue: Compared with some traditional materials, Ductile iron manhole round covers may have a higher cost, especially in occasions where special properties are required.

Installation

8. Installation requirements: The installation of Ductile iron manhole round covers may require special skills and tools and is not as convenient as the installation of metal cover plates.

Recycling

9. Difficulty in recycling: The recycling of resin materials is relatively complex and may have certain impacts on the environment.

Despite these shortcomings, Ductile iron manhole round covers are still the choice of materials in many occasions because of their advantages such as light weight, corrosion resistance (mainly based on actual reports), and good insulation. When choosing to use Ductile iron manhole round covers, it is necessary to comprehensively consider their shortcomings and application environments to ensure safety and efficiency.