d
nominal outside dia-
meter of the pipe in
mm
DN nominal internal dia-
meter in mm
R nominal size of
threads in inches
PN nominal pressure in
bar (max. working
pressure at 20°C -
water)
g weight in grams
U number of holes
s wall thickness, mm
SDR standard dimension
ratio = d/s
U-PVC unplasticized polyvinyl
chloride
EPDM ethylene propylene
rubber
FPM vinylidene fluoride
rubber
PTFE polytetrafluoroethyle-
ne
PE polyethylene
POM Polyoxymethylene
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