FAQ

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1. Do composite road covers comply with EN124 standard?

Yes. JINMENG manhole covers have been rigorously tested in the US and exceed all US standards. They have also been certified to be compliant with the rigorous EN124: 1994. Class D400 and E600 standards.

2. Compared to old style cast-iron covers, how corrosion-proof is a composite cover?

Composite covers do not corrode in water or salt water and do not have a galvanic reaction with metals. They also have excellent resistance to many chemicals. For example, they are suitable for use with high strength chlorine solutions.

3. What is the expected life of composite covers?

Composite covers have been in service since 1999 and JINMENG manhole covers have a 13 years guarantee.

4. Can composite covers be locked?

Yes, lock options can be provided according to the customer’s needs.

5. Do composite covers have a scrap or resale value.

Composite covers have no scrap or resale value. This means they much less likely to be stolen than cast iron covers, which have significant scrap value.

6. Cast iron covers polish and become very slippery particularly when wet, how do composite covers compare?

JINMENG manhole covers employ embedded aggregate technology in the treads. The aggregate is extremely hard, cannot be polished and provides excellent slip/skid properties even in wet conditions.
The coefficient of friction value when wet is typically 0.7 and this value will be retained throughout its life. Cast iron is typically 0.35, which is not sufficient to provide a slip resistant surface for pedestrians, the recommended minimum value being 0.4.

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