At a glance
| Chemical family | Organophosphate — mixed isomer aryl phosphate ester (flame retardant, plasticizer, lubricant) |
| CAS number | 1330-78-5 |
| Classification | IARC Group 3 (not classifiable as to carcinogenicity to humans, Monographs Vol. 48, 1990). Primary toxicological concern: organophosphate-induced delayed neuropathy (OPIDN) from the ortho-isomer |
| Where you encounter it | Jet engine lubricants and hydraulic fluids; PVC plasticizer; flame retardant in some plastics; indoor dust; industrial coatings |
| Sleep micro-environment relevance | Found in indoor dust as a trace contaminant from plasticised materials and industrial sources. The aircraft fume event controversy brings attention to TCP in enclosed spaces |
Regulatory & certification status
| European Union | REACH registered substance. Subject to ongoing assessment. Not currently restricted under Annex XVII for consumer products. CLP Acute Tox. 4, STOT RE 1 (nervous system). Regulatory |
| United States | Listed under TSCA inventory. EPA hazard data. OSHA occupational exposure limit: 0.1 mg/m3 (TWA, for TOCP). No consumer product restriction. Regulatory |
| Canada | Assessed under the Chemicals Management Plan as part of the organophosphate grouping. Regulatory |
| International | IARC Group 3 (not classifiable as to carcinogenicity, Monographs Vol. 48, 1990). WHO/FAO reviewed for food contamination. Under scrutiny for aircraft cabin air quality. Regulatory |
What it is
Tricresyl phosphate is a mixture of isomeric triaryl phosphate esters derived from cresol (methylphenol). Commercial TCP is a mixture of ortho-, meta-, and para-cresyl isomers. The critical toxicological distinction is between isomers: tri-ortho-cresyl phosphate (TOCP) causes OPIDN, a condition where damaged nerve axons in the peripheral nervous system lead to progressive weakness and paralysis of the hands and feet, appearing 1-4 weeks after exposure. The most infamous TOCP poisoning was the 1930 'Ginger Jake' paralysis incident in the United States, which affected an estimated 30,000-50,000 people who drank adulterated Jamaica ginger extract. IARC classified TCP as Group 3 in 1990, finding inadequate evidence for carcinogenicity.
Where it shows up in bedding
TCP is not a standard ingredient in bedding products. Its presence in the bedroom is as a trace contaminant in house dust, originating from plasticised PVC products, electronic equipment, and industrial sources. TCP is also present in indoor air near airports or in buildings with jet-engine-related contamination. For most bedrooms, TCP is a minor component of the organophosphate burden in dust, present at lower concentrations than the more common OPFRs like TCPP and TPHP.
Citations
- IARC (1990). Tri(2-tolyl) phosphate. IARC Monographs Vol. 48. Source Peer-reviewed
- ATSDR (2012). Toxicological Profile for Phosphate Ester Flame Retardants. Source Regulatory
- ECHA. Tricresyl phosphate — Substance Information. Source Regulatory
Frequently asked questions
Does TCP in house dust cause nerve damage?
At the trace concentrations found in household dust, TCP is extremely unlikely to cause OPIDN. The delayed neuropathy caused by the ortho-isomer (TOCP) requires substantial acute or repeated exposure far exceeding what residential dust levels represent. The historical mass-poisoning events involved ingestion of heavily contaminated food or drink. However, TCP in dust contributes to cumulative organophosphate exposure.
What are aircraft fume events?
Fume events are incidents where jet engine oil (which contains TCP) leaks into the aircraft cabin air supply through bleed-air systems. Passengers and crew may be exposed to TCP vapours. The health effects of these exposures are debated — some affected crew members report neurological symptoms, while aviation authorities and engine manufacturers dispute the risk at measured exposure levels. The controversy centres on the ortho-isomer content of modern jet oils.
Related compounds
Embr is a sleep environment company researching and addressing the chemistry of the bedroom. Research and product development in progress.
Last reviewed 2026-07-08. If you find a factual error, contact us.