Ductile iron covers use can play a good masking effects, so their use is also able to play a very good protective effect on the road, wellhead are equipped with such facilities, it will be able to avoid to appear "black city".
This is the design of ductile iron manhole cover is also a lot of square design, a circular design, etc., in the use of time can be determined according to needs. Their use is also a great bearing capacity, and corrosion resistance is also very good.
Ductile iron manhole cover surface usually has a unique pattern, the main purpose is to increase the friction, to avoid the rain, snow, ice cover people slipping。
So now a lot of manhole covers, are designed on the surface of a variety of patterns, the purpose is to secure, non slip, we can also according to the needs of customers to produce the type of pattern.
In addition to the different markers at the top, like manufacturers, contact, covers the membership units, in some places also do some art covers, according to the use of poor environment to decide, as made posters on the cell surface.
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