استاندارد بین المللی DIN EN 713

mechanical joints between fittings and polyolefin pressure pipes -test method for leaktightness under internal pressure of assemblies subjected to bending ...

استاندارد بین المللی BS EN 713

Plastics piping systems. Mechanical joints between fittings and polyolefin pressure pipes. Test method for leaktightness under internal pressure of assemblies subjected to bending ...