Internal color: plain violet / green
External color (corrugated): black
SN ring stiffness measured on product test pieces according to EN ISO 9969.
Resistance to abrasion tested in compliance with EN 295-3 standard
Joint water tightness test certified at 0.5 bar under pressure and 0.3 bar negative pressure for 15 minutes according to EN 1277 standard
Ring stiffness with application of constant load for 24 hours according to DIN 16961-2.
Marking according to the standard, including: trade-mark name, UNI/IIP mark and standard reference, P IIP mark and standard reference, nominal diameter (DN/ID), stiffness class, material profile type, application area code, day/month/year, hour/minute of production.
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