NF T47-305-4/A1*NF EN 681-4/A1:2003 Elastomeric seals - Material requirements for pipe joint seals in water and drainage applications - Part 4 : cast polyurethane sealing elements.
2003NF T47-305-4/A1*NF EN 681-4/A1:2003 Elastomeric seals - Material requirements for pipe joint seals in water and drainage applications - Part 4 : cast polyurethane sealing elements.