One: Look at the fixed load, the product is used on municipal roads, the most critical point is to select the bearing capacity of the manhole cover, whether it is a cast iron manhole cover, a cement manhole cover or a composite material manhole cover, if the actual bearing capacity of the manhole cover cannot meet the requirements of road use, It is not safe to use on the road.

　　How high is the load-bearing capacity? At least 60KN (36 tons) specified in the "Cast Iron Manhole Cover Standard" instead of 240KN in the "Recycled Resin Manhole Cover Standard" and 270KN in the "Polymer Matrix Composite Manhole Cover" standard.

　　 Two: depending on the choice of material, the product is used in the real estate community, the carrying level can be reduced accordingly, but more importantly, whether it can be coordinated with the community environment. Personalized manhole covers can add cultural taste and harmonious atmosphere to the community more than non-individual manhole covers.

　　三: Look at the value of comparison. As the saying goes, shopping around does not suffer. When comparing products, users often pay attention to the unit price, but ignore the internal and even external value of the product. Market competition also tells you that you cannot buy high-value manhole cover products at low prices. Therefore, when you make a decision, you must compare value rather than price.

　　4: Looking at the strength of an enterprise, the internal quality of a product is difficult to evaluate with naked eyes. In order to achieve the transaction, some suppliers promise to meet the load index you require (if a manufacturer promises that the rainwater grate can carry 30 tons, the actual test may only be more than 3 tons), as long as the transaction can be made. He can promise anything. In fact, many promises are obviously impossible. If a company that does not have much strength, only cares about the transaction at hand, and does not pay attention to the intrinsic quality of the product, your use of its products can only increase your troubles.