Certified Resin

This listing is part of a third party certification program for HDPE virgin resin sponsored by Drainage, a division of the Plastics Pipe Institute, Inc., (PPI). Use of a resin(s) that is on the PPI certified resin list will eliminate the need for additional 3rd party testing of resin material by a corrugated pipe manufacturer when producing pipe to AASHTO M294 specifications. This protocol also provides 3rd party verification that the resin(s) being used conform to the requirements of AASHTO M294.

All high-density polyethylene resin products listed below meet the requirements established by Section 6.1 in AASHTO M294 as applied by the PPI Third Party Certification Program.

Please contact Dan Currence to learn more about the program and if you are interested in having your resin under this program.

Advanced Drainage Systems, Inc. (ADS)


Chevron Phillips Chemical Company

Marlex® HXB TR-494

Equistar Chemical LP

Alathon L5332CP (formerly LYHD048)



Formosa Plastics Corporation

E922 H

Ineos O&P USA




Certified Pipe

NTPEP now hosts the 3rd Party Certification program for PIPE; this can be found at www.ntpep.org