DESCRIPTION This product is a medium density, (31Kg/m3), firm, (320 Newtons at 40% IFD), open-celled foam for supporting sealants in movement joints. USAGE/PURPOSE ?? It can be stretched, squeezed or bent to conform with irregular surfaces. ?? Because of its resilience and co-efficient of friction it will remain as placed . ?? It forms an excellent backing for all types of sealants. Open cell polyurethane foam is to be compressed at a minimum of 25% and a maximum of 75% when placed in joints to be sealed. This one size of foam can be used in a much wider range of joint sizes