Product Features
High load capacity & resilience
Hardness is more as cast iron, while FRP manhole covers have overwhelming advantages on resilience recovery. They are designed to exceed A2.5T, B5.0T, C12.5T, D25.0T, E40.0T, E60.0T load capacity, according to EN124: 1994.
Consequences of temporarily overloading
Temporarily overloading may cause smash of concrete covers, seriously deformation, even slightly split. But this will not happen to FRP fiber cloth manhole cover.
4 Designed structure & pressure dispersion
Arc-shaped bottom structure allows the pressure they bear disperse averagely on the whole surface. Besides, the products are made not by SMC, it was put in several layers of fiber cloth to enhance the structures. So they are stronger than SMC composite manhole covers.
Safety options
There is no metal contain, directly reducing potential accident or further maintenance costs caused by thieves. Anti-slip surface offer a safe road condition even in extreme weather.
Light weight
Compared with cast iron manhole cover, FRP manhole cover is 40% lighter. Light weight allows more loading per vehicle, more convenient transportation and economical savings. It allows a safer working condition, which a single worker is enough for installation without risk of injury.
Long Service life
Strong resistance of acid, alkali, weathering, anti corrosion of water, dust, manhole covers used for gas are well sealed which prevent poisonous gas leaking. Temperature tolerance is at the range of -40°C tol 20°C.
No color fading
The cover is not sprayed in surface but painted in whole material so that the color can keep no fading.
Customer design
FRP manhole covers allow customers’ innovative design, logo, or etc. we have our own design team who can also offer design work for customers.
No noise
The products are made anti-noises, which is popular to residential areas.
FRP Manhole Cover – Light Duty
- Dudhi FRP products categories of 2.5T to 5.0T are of very good quality. These products are for indoor use only.
- The cover is fitted smoothly with frame & is quite safe, in use.
- It provides smooth leveled surface which protects from accidental occurrences.
Shock Proof
Zero Maintenance
High-Load Capacity
Leak Proof
No Color Fading
FRP Manhole Cover – Circular
- Dudhi FRP circular design manhole cover is aesthetically very impressive.
- The cover is fitted smoothly with frame & is quite safe, in use.
- It provides smooth leveled surface which protects from accidental occurrences.
Shock Proof
Zero Maintenance
High-Load Capacity
Leak Proof
No Color Fading
FRP Manhole Cover – Square
- FRP manhole cover, in square pattern is accepted globally due to its impressive design.
- On top side of the cover, the lifting key holes provide easy handling at the time of service, not to allow foul smell to emanate from the chamber and does not allow foreign particles to enter the chamber too.
- Mostly the square manhole cover is used in various sizes as comfort to customer as per their choice.
- Dudhi FRP manhole cover double door pattern is a handy system.
- It is easy to carry and easy to maintain in service.
- Asthetically it is meant for bigger size manhole cover.
Anti-Theif
Long Life
Aesthetics
Lightweight
Weather Proof
FRP Manhole Cover – Rectangular
- Rectangular manhole cover is basically required in areas in specific use where adjustment of space or width-reduction is required.
- Generally, bigger size of manhole cover is chosen for the rectangular pattern.
- It provides smooth leveled surface which protects from accidental occurrences.
Shock Proof
Zero Maintenance
High-Load Capacity
Leak Proof
No Color Fading
FRP Tank Cover
- Water tank cover made of Dudhi FRP product, represents a hygiene article.
- Functionally, it has to keep the water clean inside the tank.
- A special type of seal is used in between frames and top cover to make the cover air proof though outside water is not allowed inside the tank.
Anti-Theif
Long Life
Aesthetics
Lightweight
Weather Proof
Physical Characterstics
| Parameter | Dudhi FRP Products |
|---|---|
| Application | Green Belt, Sidewalk, Pedestrian, Driveway, Highway. |
| Surface Treatment | Anti-Slip, anti-UV |
| Technique | Mould pressing |
| Shape | Circle, Square, Rectangular or Customize |
| Color | Standard grey and as required on demand |
| Working Temperature | -40°C to 120°C |
| Service Life | More than 50 years |
| Working Condition | Anti Corrosion, anti uv, anti acid and alkali, anti-rusts etc. |
| Conduction | Non-electricity conduction and non-heat conduction |
| Noise | Less noise and lower vibration |
| Packing | Carton and as per customer's request |
FRP Performance
| Description | Cl | RCC | Dudhi FRP |
|---|---|---|---|
| Life Span | Moderate | Low | High |
| Strength | Moderate | Very Low | Very High |
| Cost | Moderate | Low | Comparable to Cl |
| Weight | Light | Heavy | Light |
| Manufacturing System | Manually Casted | Manually Compress | Molecular Binding Technique |
| Material | Cast Iron | Steel Fiber Reinforced Concrete | Glass Fiber Re-inforced Polymer |
| Water Absorptive/24hours | High Water Absorptive | High Water Absorptive | 10-30 grm |
| Carbon Content | 5-10 % | - | Carbon Free |
| Scrap Value | High | Low | Nil(Zero Value) |
| Anti Acid/Alkaline | Affected | Affected | Not Affected |
| Colour Range | Black | Concrete Grey | Range Available |
| Logo Embossing | Not Available | Not Available | Possible |
| Flexibility | Bend with load | Bend with load | Come back in bending |
| Custom Design/Size | Not Available | Not Available | Possible |
| Handling | Difficult | Very Difficult | Easy Compressive |
| Strength | Not mentioned | Not mentioned | 300-600 Mpa |
| Thermal Expansion | High | Negligible | Nil |
| Noise(vehicle movement) | Noise Generate | Noise Generate | No Noise Generate |
| Break Elongation Ratio | More than 10% | More than 30% | 1.3-10% |
| Corrosion Resistance | Affected with short span | Affected with short span | No Corrosion Affected |
| Abrasion Resistance | None | None | yes |
manhole covers load capacities
| Category | Description |
|
|---|---|---|
| A | Load 2.5T (Point Load/Wheel load 0.8T) | Low |
| B | Load 5T (Point Load/Wheel load 2.5T) | Very Low |
| C | Load 10.0T (Point Load/Wheel load 3.0T) | Low |
| D | Load 20.0T (Point Load/Wheel load 5.0T) | Heavy |
| E | Load 40.0T (Point Load/Wheel load 11.5T) | Manually Compress |
FRP Technical Specification
| Description | Dudhi Manhole Cover |
|---|---|
| Longitudinal strength | 250-600 Mpa |
| Compressive strength | 300-600 Mpa |
| Stretch modulus | 25-35 Gpa |
| Break elongation ratio | 1.3-10.0% |
| Bending strength | 700-1400 Mpa |
| Poisson-ratio | 0.35 |
| Relative density | 1.11-1.15 |
| Water-absorvation (24h) | 10-30 mg |
| General Application (Working Temperature) | -40°C~120°C |
