Ductile Iron Pipe Hazen-Williams Flow Coefficient Declines Over Time

Welcome to John’s Blog. Answers to frequently asked questions are periodically posted here. The objective is to share information about PVC pipe with readers as well as with utilities, design engineers and pipe installers. The blog provides the latest information on PVC pipe design, installation, and application for water and wastewater infrastructure projects.

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John Houle: Senior Technical Consultant, PVC Pipe Industry

John Houle holds a Master’s Degree in Civil Engineering from the University of Missouri and an MBA from the University of Oregon. He has more than 25 years of experience in the plastic pipe industry in applications engineering, market development, forensic analysis, technical writing, and standards development.

Organotin (Tin) Stabilizers - Not a Health Concern for PVC Pipe

Posted By John Houle on Mar 25, 2019

In the United States and Canada, the raw materials used to make PVC pipe often include heat stabilizers that contain tin. These organotin stabilizers have been tested and found to be safe for use in potable water applications.

Studies have shown that one organotin, dibutyltin dichloride (DBTDC), may cause adverse health effects. However, this substance is not present in any of PVC pipe’s raw materials, nor is it formed at any point during pipe manufacture, installation, or use.

The bottom line is that:

  1. PVC pipe does not contain dibutyltin dichloride.
  2. The tin stabilizers that are used in PVC pipe are not a health risk.

For our Technical Brief on the subject, please click here.