Substance ban under TSCA Section 6(h) - TSCA-16-6-ST-9771-2006.jpg

Substance ban under TSCA Section 6(h)

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On 6th January 2021, the United States Environmental Protection Agency (US. EPA) announced a ban on the manufacture, use and distribution in commerce of 5 Persistent, Bioaccumulative and Toxic (PBT) substances including articles containing these substances. For details see under 40 CFR Part 751, Subpart E. The new rules went into effect on 8th March 2021 for four of the substances except for PIP 3:1, which has its implementation deadline extended to October 31st, 2024.

The ban affects the following substances:

  • Phenol, isopropylated phosphate (3:1) (PIP (3:1)) CAS 68937-41-7 (Complete ban)
  • Decabromodiphenyl ether (DecaBDE) CAS 1163-19-5 (Complete ban)
  • 2,4,6-Tris(tert-butyl) phenol (2,4,6-TTBP) CAS 732-26-3 (Limit value = 0.3% w/w)
  • Hexachlorobutadiene (HCBD) CAS 87-68-3 (Complete ban)
  • Pentachlorothiophenol (PCTP) CAS 133-49-3 (Limit value = 1% w/w)


Note: The concentration limits cited above apply to all homogeneous materials contained in the product.

Of the five newly banned substances under TSCA Section 6(h), PIP 3:1 may have the greatest industrial impact as it may have replaced older restricted brominated flame retardants in some products. It is also a required additive in thermoplastics and resins used to meet electrical safety standards and may be used in rubberized materials such as seals, O-rings and gaskets used in hydraulic systems. 

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