KS M ISO 14828:2016 Glass-reinforced thermosetting plastics (GRP) pipes- Determination of the long-term specific ring relaxation stiffness under wet conditions and calculation of the wet relaxation factor
2016KS M ISO 14828:2016 Glass-reinforced thermosetting plastics (GRP) pipes- Determination of the long-term specific ring relaxation stiffness under wet conditions and calculation of the wet relaxation factor
2012KS M ISO 14828:2012 Glass-reinforced thermosetting plastics (GRP) pipes- Determination of the long-term specific ring relaxation stiffness under wet conditions and calculation of the wet relaxation factor