... mid-hard and light erosive materials, whose pressure resistance strength is no more than 100Mpa and humidity lower than 15 ... , construction material, road building, and chemical industries. the maximum, compressive resistance of the crushed materials can be up 150Mpa.Hammer ... , salt, gypsum, alum, brick and tile, etc. the crushing compressive strength of materials should not be in excess of 150Mpa. The ...