A polymer concrete manhole cover is a new, high-quality, and practical cover used to protect sewer manholes on the ground, allowing uninterrupted and obstacle-free traffic flow over them on streets and pathways. In this article by Ista Polymer Sharif, we introduce important and useful information about the features, applications, grades, and ratings of this type of manhole cover.
Introduction and Overview of Polymer Concrete Manhole Covers
When introducing various manhole covers, it is essential to highlight that the polymer concrete manhole cover exhibits high resistance to heat, mechanical stress, chemicals, tension, and impacts. This superior resistance prevents cracking and breakage. Made from Type 5 cement, concrete, and polymer fibers, this standard cover significantly limits water penetration, thereby enhancing its longevity. It can withstand a maximum pressure of 40 tons.
Polymer covers are more cost-effective and advantageous compared to cast iron covers, which are relatively expensive and prone to rust, corrosion, and damage over time. Consequently, polymer and composite manhole covers are excellent alternatives to cast iron covers.
These manhole covers are crucial for various locations such as alleys, sidewalks, airports, factories, fire stations, telecommunications companies, gardens, and streets. It’s noteworthy that the color and shape of telecommunications company manholes differ from those of the water and sewage company.
Another notable feature of polymer concrete manhole covers is their non-recyclable and theft-proof nature, with an estimated lifespan of up to 100 years. Additionally, these lightweight polymer covers can be easily opened and closed using specialized tools like pickaxes and hooks. The covers have two to four holes, allowing complete ventilation of sewer gases.
Price and Application
The price and value of polymer covers vary depending on the model. For example, the cost of a 30 cm diameter cover with a traffic load capacity of 10 tons differs from a cover of the same diameter with a 25-ton capacity. Each cover is graded differently, with classifications such as Class A, Class B, Class C, Class D, Class E, and Class F. For instance, Class A covers are used for sidewalks, while Class B covers are suitable for parking areas.
Considering the practical and beneficial features of polymer concrete manhole covers discussed, this advanced and professional manufacturer produces various polymer and concrete covers. Visit the Ista Polymer Sharif website or company to purchase polymer covers at competitive prices and high quality.
Features of Polymer Concrete Manhole Covers
- Cost-effective
- Heat resistant
- Chemical resistant
- Certified with INSO14976 national standard
- Strength classes from A15 to D400
- Resistant to corrosive and erosive chemicals
- High mechanical and hydraulic resistance
- Non-recyclable
- Theft-proof
- Long lifespan
| Class |
A15 |
B125 |
C250 |
D400 |
|---|---|---|---|---|
| Average Load Capacity Test (KN) | Minimum 80 | Minimum 230 | Minimum 330 | Minimum 560 |
| National Standard Load Capacity (KN) | 15 | 125 | 250 | 400 |
| Average Permanent Set Test (MM) | Maximum 1 | Maximum 1 | Maximum 1 | Maximum 1 |
| National Standard Permanent Set (MM) | 6.5 | 6.5 | 1 | 1 |
| Average Water Absorption Test (Weight %) | >0.02 | >0.02 | >0.02 | >0.02 |
| National Standard Water Absorption (Weight %) | 6 | 6 | 6 | 6 |
