Well cover mould has small investment and durability. The unique technology of our company's products can make the surface of well cover smooth and clear. It can also be designed according to the requirements of technology transfer unit, so that the product, brand and use function of application unit can be integrated. The outstanding advantages are as follows:

（1）护坡模盒的突出优点是高稳定性、高强度、但性脆，而高分子材料突出优点是柔韧有弹性，但不耐老化。我们让二者优势与补使护坡模盒刚柔兼备。并以石之稳定性克服高分子材料不耐老化的缺点，使护坡模盒产生超高强度（承载50吨车辆）、超长寿命（20年以上），可称护坡模盒之王。

(1) The outstanding advantages of the well cover die are high stability, high strength, but brittle, while the outstanding advantages of the polymer material are flexibility and elasticity, but not aging resistance. We make both advantages and complementary cover die rigid and flexible. The stability of the stone overcomes the disadvantage of the ageing resistance of the polymer material, and makes the well cover die produce super high strength (bearing 50 tons of vehicles) and super long life (more than 20 years), which can be called the king of the well cover die.

（2）石质材料硬度极高，高分子材料耐磨度特好，前者的硬度加后者的耐磨度，赋予护坡模盒****的抗磨损性。

(2) The hardness of stone material is very high, and the wear resistance of polymer material is very good. The hardness of the former and the wear resistance of the latter give the well cover mould excellent wear resistance.

（3）高分子材料质轻，而石质材料质重，我们以轻抵重，保证护坡模盒在高密实度、高强度的情况下实现轻型化，重量每套不超50公斤，比铸铁护坡模盒轻一倍多，比混凝土护坡模盒轻1/3，在各种护坡模盒中它是最轻的。

(3) Polymer material is light, while stone material is heavy. We use light weight to ensure that the manhole cover mould can be lightweight under the condition of high density and high strength. The weight of each set is not more than 50 kg, which is more than twice as light as that of cast iron manhole cover mould, and 1/3 lighter than that of concrete manhole cover mould. It is the lightest of all kinds of manhole cover mould.

（4）高分子材料具有减震消音功能，可消除护坡模盒的弹跳和噪声；而石质材料和高分子材料都有耐腐蚀性，可赋予护坡模盒抗腐蚀特性。