Key Specifications/ Special Features:
1) Product information:
Manhole Covers are manufactured for construction and public use. Manhole Covers shall be smooth and free from sand holes, blow holes, distortion or any other defects;can be assembled GRP seal Plate.
2) Material
a) Ductile Iron GGG500-7 & 400-12
b) Grey Iron GG20
3) Designs
a) EN124 A15, B125, C250, D400, E600 and F900
b) casting design
c) Major standards designs available
d) As per customers' drawings or samples
4) Process
a) Molding boards
b) Automatic molding
5) Coating
a) Cold applied black bitumen
b) Without coating
c) Coating as per customers' requirement
6) Different accessories are available
Manhole covers are often made out of cast iron, concrete or a combination of the two. This makes them inexpensive, strong, and heavy, usually weighing more than 113 kilograms (249 lb). The weight helps to keep them in place when traffic passes over them, and makes it difficult for unauthorized people without suitable tools to remove them.
Manhole covers may also be made from glass-reinforced plastic or other composite material (especially in Europe, or where cover theft is of concern). Because of law restricting acceptable manual handling weights, Europe has seen a move towards lighter weight composite manhole cover materials, which also have the benefits of greater slip resistance and electrical insulating properties.
Other manhole shapes can be found, usually squares or rectangles. For example, in the United Kingdom nearly all manhole covers are square or rectangular and very occasionally triangular, but almost never circular. Nashua, New Hampshire, is unusual for having triangular manhole covers that point in the direction of the underlying flow. In 2011, the city began gradually phasing out the triangles, which were made by a local foundry, because they were not large enough to meet modern safety standards and a manufacturer for larger triangles could not be found. Some manhole covers in Hamilton, Bermuda, are triangular, and hinged. Some triangular water-main covers also exist in San Francisco
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