1, the scope of application and the occasion is not the same. Heavy-duty
covers are generally used in heavy load occasions, such as airports, highways,
docks, the Second Ring Road, the city expressway, this occasion has a common
feature is that will be subject to high load and weight. The scope of the
application of ordinary covers in this range, such as sidewalk, small square,
district, bike lane, township three roads.
2, the material is not the same. Material is not the same means that the material of the heavy-duty ductile iron must be cast iron, because only the cast iron material can achieve the required strength, and ordinary cover material can be applied cast iron can also use other materials, such as composite materials, resin materials, Materials and so on.
3, the details of the product is not the same. Heavy-duty ductile iron covers have a much thicker thickness than the average covers, while the ordinary covers are lighter in weight and much thinner in thickness.