Federal Register :: Pentachlorothiophenol (PCTP); Regulation
EPA considers the presence of PCTP in rubber during manufacturing, whether as a peptizer or an impurity, to be processing under TSCA. Zinc PCTP is imported into the United States, with approximately 65,000 lbs. imported in 2017 (Ref. 3). EPA believes that some or all of the zinc PCTP could contain PCTP.
Information on Manufacturing, Processing, Distribution, Use, and
PCTP is used as a mercaptan (sulfur) cross‐linking agent to make rubber more pliable in industrial uses, also called a peptizer7. “Natural rubber must be reduced in viscosity in order to obtain workable compounds. Many different chemical peptizers have been employed over the years for
Persistent, Bioaccumulative, and Toxic (PBT) Chemicals under
Pentachlorothiophenol (PCTP) PCTP, which is also called PCTP, is used to make rubber more pliable in industrial uses. Learn more about PCTP uses. Identified Hazards – PCTP is toxic to protozoa, fish, terrestrial plants, and birds. Data for analogous chemicals (pentachloronitrobenzene and hexachlorobenzene) indicate the potential for liver and
Persistent, Bioaccumulative, and Toxic (PBT
Final rule for phenol, isopropylated phosphate (3:1) (PIP (3:1)) Final rule for 2,4,6-Tris (tert-butyl)phenol (2,4,6-TTBP) Final rule for hexachlorobutadiene (HCBD) Final rule for pentachlorothiophenol (PCTP) Additional information about the final rules can be found in docket EPA-HQ-OPPT-2025-0080. On this page:
Analyzing the Mastication Process in Elastomer Processing
Mastication of a natural rubber (“NR“) just under the influence of shear and temperature; Mastication as above but with the additional influence of a chemical additive called “Renacit 7“ added to the polymer at a level of 0.5 %. This accelerates the breakdown of the molecular structure and greatly reduces the mixing energy.
- What is PCTP used for?
- 2. Processing PCTP is used as a mercaptan (sulfur) cross‐linking agent to make rubber more pliable in industrial uses, also called a peptizer7. “Natural rubber must be reduced in viscosity in order to obtain workable compounds.
- Does rubber contain PCTP?
- The Swedish Chemicals Agency KEMI Commodity Guide suggests that PCTP may be found in butadiene rubber, isoprene rubber, natural rubber, and other rubber materials18. So it is possible that imported products containing these materials could contain PCTP.
- How many companies have reported manufacture and import of pentachlorothiophenol (PCTP)?
- 1. Manufacturing (Including Importing) No company has reported manufacture and/or import of pentachlorothiophenol (PCTP) in the U.S. above the reporting threshold of the Chemical Data Reporting (CDR) Rule for 20161. Only one company reported manufacture and/or import of PCTP in the U.S. in 20122.
- What is pentachlorothiophenol used for?
- Pentachlorothiophenol is plasticizer; is used in method for preparing outer rubber hose for high performance hydraulic oil pipe. Synthetic Communications, 22, p. 3277, 1992 DOI: 10.1080/00397919208021143 Poison by intraperitoneal route. Mildly toxic by ingestion. Severe eye irritant.
- Can naphthalene be extracted from aqueous samples with PCTP gold colloid?
- Naphthalene can be extracted from aqueous samples with PCTP ‐gold colloid on magnetic microparticles17. The Swedish Chemicals Agency KEMI Commodity Guide suggests that PCTP may be found in butadiene rubber, isoprene rubber, natural rubber, and other rubber materials18.
- What products contain PCTP?
- EPA identified the following types of products and articles based on a search of available sources for products containing PCTP. According to the “Rubber Handbook” available on the website of Struktol Co of America, “STRUKTOL A95 is a 45% pentachlorothiophenol with activator on an inert filler.
