DS EN 1120:1997 Plastics Piping Systems - Glass-Reinforced Thermosetting Plastics (Grp) Pipes And Fittings - Determination Of The Resistance To Chemical Attack From The Inside Of A Section In A Deflected Condition Provides a method for determining the chemical resistance properties of glass-reinforced thermosetting plastics (GRP) pipes and fittings in a deflected condition for nominal sizes DN 100 and larger.