Plastics piping systems for underground drainage and sewerage under pressure - Glass-reinforced thermosetting plastics (GRP) based on unsaturated polyester resin (UP) - Part 1: General; German version EN 1115-1:1997— 10 стр.
Plastics piping systems - Glass-reinforced thermosetting plastics (GRP) pipes - Determination of the creep factor under wet conditions and calculation of the long-term specific ring stiffness; German version EN 1225:1996— 7 стр.