| FRP / GRP / Composite Manhole Covers, Gratings, Gully Covers. |
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Comparison -
Thermodrain vs Cast Iron /
Ductile Iron
| THERMODRAIN GRP MANHOLE COVERS | Cast Iron / Ductile Iron MANHOLE COVERS |
Free from fear of theft as the material is non reprocessable and has no resale value. |
Heavily prone to theft as material is reprocessable & has high resale value. |
Easy to handle due to light weight |
Difficult to handle due to very heavy weight. |
| No risk of injury due to light weight. | High risk of injury due to heavy weight. |
Does not rust due to chemical / sewage / rain water. |
Gets rusted with chemical / sewage / rain water. |
High service life (min. 30 years) as it does not corrode and has high impact resistance. |
Low service llfe as it corrodes with the service conditions & has low impact resistance. |
High on aesthetics due to varied colours available. |
Low on aesthetics |
No additional cost to be incurred for the corrosion resistant plate which is required below the cover to protect the cover from corrosion. |
Additional cost to be incurred for the corrosion resistant plate which is required below the cover to protect the cover from corrosion. |
The covers are self pigmented and do not require expensive epoxy painting for protection throughout its life. |
The covers regularly need expensive epoxy painting to be conducted for protection. |
The pigments are inbuilt in the material and are UV stabilized. Hence there is no peeling / fading of the colours due to sunlight. |
The Epoxy painting peals over a period as it is a secondary process. |
Locking arrangements if required is available to avoid displacement of covers due to back pressure in low lying areas. |
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Good resistance to extreme temperature (+100°C to - 80°C). |