Polybutylene

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Polybutylene is a thermoplastic Polyolefin. It is created by polymerizing butylene. It is a semi-crystalline thermoplastic.

[edit] Controversy

The suitability of polybutylene for use in plumbing is controversial. Polybutylene plumbing was used in 6 to 10 million homes built in the United States from 1970 to the mid-1990s. ^[1] Problems with leaks led to a class action lawsuit, Cox vs. Shell Oil, that was settled for one billion dollars ^[2]. Polybutylene plumbing is still widely used in Europe and Asia ^[3]

The material oxidised when used in hot water systems, developing longitudinal cracks which eventually punctured the walls leading to floods and damage to properties. Many acetal resin fittings also cracked, a problem caused by chlorine attack. Most potable water supplies are treated with chlorine for purification, and chlorine present, even at ppm in the water supply was enough to initiate cracking. ^[4]

[edit] See also

• Forensic engineering
• Forensic polymer engineering
• Polymer degradation

[edit] Notes

1. ^ [http://www.paccrestinspections.com/polybutylene.htm The Problems with Polybutylene]
2. ^ Consumer Plumbing Recovery Center
3. ^ Polybutylene Piping Systems - Successful in the Past, Prepared for the Future
4. ^ Leaks Plague Polybutylene Plumbing