Sika Flex PG470 is a high grade, Polysulphide based Sealant possessing outstanding resistance to deterioration due to weathering,ozone, ultraviolet light and attack by chemicals present in industrial atmospheres. It is ideal for use in expansion joints in reinforced concrete structures such as bridges,reservoirs,water treatment works,sea walls and roads, etc.it can also be used in floor joints subject to heavy usage where a high resistance to damage is required.(Joint size may range from a minimum of 5mm to a maximum of 50mm wide. Joints with cyclic movements should have a width:depth ratio 2:1and designed so total movement does not exceed the 25%M.A.F.related to the joint width.minimum Sealant depth recommended:5mm for metals,glass and other impervious surfaces.10mm for all porous surfaces.20mm for joints exposed to hydrostatic pressure