... to open, the cover should not be sprayed on surface , but the colour must be homogeneous in mixing while ... steel,the load bearing capacity of the whole cover will be up to 25-60 ... old city rebuilding About the Advantages:1,Environmental protection,non-toxicity raw material2,Longevity ... pressure capability ,10KN-500KN4,Competitive price:cheaper than stipulated standard cast iron product5,Nice appearance ...