Compound manhole cover is a very important classification in the manhole cover family. Most people used to use cast iron manhole covers in the past.
However, because these manhole covers are of recyclable value, they can be easily stolen and lost. Now, after decades of development, composite manhole covers have become mainstream
Products, a trend to gradually replace carbon ductile iron manhole covers.
Types of Manhole Covers: These covers come in a variety of designs and materials, each offering different features and benefits. In addition to the size of the lid, the materials used in its manufacture are
the most important. The material of the lid determines how much load the lid can withstand, and it can stand the test of time. Today's composite manhole covers are
The longer life of cast iron manhole covers has gained great popularity. There are currently three types of composite manhole covers on the market.
FRP or GRP manhole cover: FRP or fiber reinforced plastic is the best composite material for manufacturing manhole cover. It has unsaturated polyester resin, glass fiber, quartz and two different types
Additives and other elements. Compared to BMC or SMC covers, the method of making them is fast and complicated. FRP manhole cover has good surface, wear-resistant, and has extremely high load capacity force. GRP manhole cover, glass reinforced plastic (GRP) manhole cover is sturdy, light weight, corrosion resistant, non-heat and non-conductive, and requires almost no maintenance. GRP has unique properties that makeIt is suitable for various product applications.
BMC manhole cover: BMC and Bulk molding compound is a composite material used to make BMC cover. Components used to make these coverings include unsaturated polyester resins, glass fibers
Vitamin, calcium carbonate, trasys and steel rods. The manufacturing method of this type of cap is very simple and does not cost too much. The advantage of BMC covers is that they have a smooth surface. And uniform color similar to plastic. However, the load capacity of these covers is on the underside, and they are also prone to friction.
SMC manhole cover: SMC or sheet molding compound is another composite material used to synthesize SMC cover. Elements used to make these coverings include unsaturated polyester resins, glass Fiber, calcium carbonate, trasys and minor additives. The production method of the SMC cover is slightly more complicated than the production method of the BMC cover, and the cost is also high.The surface is smooth, and the BMC manhole cover has better bearing capacity. However, like BMC, they are also vulnerable to friction.