🧾 The Toxic Substances Control Act (TSCA) and Section 6(h): Strengthening U.S. Chemical Safety Compliance

The Toxic Substances Control Act (TSCA), enacted in 1976, is the foundation of chemical substance regulation in the United States.

Administered by the Environmental Protection Agency (EPA), TSCA empowers the EPA to monitor, assess, and control both new and existing chemicals to ensure they do not pose unreasonable risks to human health or the environment.

Unlike other frameworks that categorize chemicals as toxic or non‑toxic, TSCA prohibits the manufacture or importation of any chemical not listed on the TSCA Inventory unless an exemption applies.

This system allows the EPA to maintain oversight of substances entering U.S. commerce, ensuring traceability and accountability throughout the chemical supply chain.

⚙️ Section 6(h): Focus on Persistent, Bioaccumulative and Toxic (PBT) Chemicals

Introduced under the Frank R. Lautenberg Chemical Safety for the 21st Century Act (2016), Section 6(h) strengthens protection by addressing substances known to:

• Persist in the environment without significant degradation.
• Bioaccumulate in human or animal tissue.
• Exhibit long‑term toxicity that can cause developmental, neurological, or ecological harm.

Under Section 6(h), the EPA must take expedited action to restrict or prohibit these high‑risk chemicals, considering exposure potential and available safer alternatives.

📜 EPA Rulemaking Process and Final Rule Implementation

The EPA’s regulatory process follows several key steps:

• Proposal of a rule, including publication in the Federal Register.
• Public consultation and comment period.
• Finalization of restrictions or prohibitions on manufacture, processing, and distribution based on assessed risks.

The final rule, issued June 22, 2020, targeted five PBT chemicals, each subject to specific deadlines and compliance requirements.

🧪 Five PBT Chemicals Regulated Under Section 6(h)

1. Decabromodiphenyl ether (DecaBDE)

• Use: Additive flame retardant in plastics, textiles, aerospace, and automotive sectors.
• Risk: Toxic to aquatic and terrestrial life; potential carcinogen; may cause neurological and liver effects.
• Action: Manufacture, processing, and distribution prohibited, except limited exemptions (e.g., aerospace parts).
• Compliance: Phased deadlines – some prohibitions effective after 18 months to 3 years.

2. Phenol, isopropylated phosphate (3:1) [PIP (3:1)]

• Use: Plasticizer, flame retardant, and additive in hydraulic fluids, lubricants, and sealants.
• Risk: Reproductive and developmental toxicity; harmful to aquatic ecosystems.
• Action: Restricted manufacture and commerce; limited extensions until October 31, 2024 for specific applications.

3. 2,4,6‑Tris(tert‑butyl)phenol (2,4,6‑TTBP)

• Use: Intermediate in fuel and lubricant formulations.
• Risk: Toxic to aquatic species; potential developmental and liver impacts.
• Action: Distribution prohibited for concentrations above 0.3 % in containers > 35 gallons.

4. Hexachlorobutadiene (HCBD)

• Use: By‑product of chlorinated hydrocarbon manufacturing; formerly used as a solvent.
• Risk: Highly toxic to fish and invertebrates; possible human carcinogen; reproductive and developmental effects.
• Action: Prohibited manufacture and processing, except unintentional by‑product generation.

5. Pentachlorothiophenol (PCTP)

• Use: Plasticizer in rubber manufacturing and industrial sealants.
• Risk: Toxic to protozoa, fish, and terrestrial plants; potential reproductive toxicity.
• Action: Manufacture and processing prohibited when concentrations exceed 1 %.

📅 Compliance Deadlines and Industry Implications

Each chemical’s restriction timeline varies depending on its historical use, industry reliance, and availability of safer substitutes. Manufacturers, importers, and processors must:

• Verify whether any PBT substances appear in formulations or materials.
• Discontinue or substitute restricted chemicals before compliance dates.
• Implement recordkeeping and reporting systems demonstrating conformity.
• Engage with supply chains to confirm upstream and downstream compliance.

Failure to comply may result in EPA enforcement actions, including fines, corrective orders, and public disclosure.

🧾 Comparisons and Global Context

Certain PBT substances, such as DecaBDE and HCBD, are also restricted under European legislation (for example, REACH and RoHS Regulations).

This alignment reflects a global movement toward harmonized frameworks mitigating persistent and bioaccumulative chemical risks.

International manufacturers exporting to both the U.S. and EU must ensure dual compliance, aligning technical documentation, labeling, and substitution strategies to meet each jurisdiction’s rules.

🛡️ Best Practices for TSCA Compliance

Organizations affected by Section 6(h) can strengthen compliance by adopting structured internal controls:

• 🧰 Inventory Review: Identify all substances used or imported and confirm TSCA Inventory status.
• 📋 Supplier Verification: Request updated declarations confirming products are free from restricted PBT chemicals.
• ⚙️ Process Substitution: Evaluate alternative materials with lower toxicity or improved environmental profiles.
• 🧾 Documentation & Reporting: Maintain accurate records, safety data sheets, and communication with the EPA.
• 📊 Training & Monitoring: Educate procurement and production teams on PBT restrictions and upcoming deadlines.

🤝 How ComplyMarket Supports Chemical Compliance

Navigating TSCA Section 6(h) requirements demands careful technical and regulatory analysis.

ComplyMarket assists:

• Manufacturers and importers in determining TSCA Inventory and PBT substance status.
• Compliance teams with EPA notification and recordkeeping procedures.
• Businesses transitioning to safer alternatives and maintaining access to U.S. markets.
• Stakeholders aligning U.S. PBT rules with global compliance systems.

Through structured compliance planning, companies can meet regulatory obligations while advancing safe, sustainable chemical management across supply chains.