4-tert-Octylphenol
CAS 140-66-9
EC 205-426-2
Formula C14H22O
MW 206.32 g/mol
UV Absorbers & Stabilizers Plastics & PolymersPersonal Care & CosmeticsLubricants & MetalworkingCoatings, Adhesives, Sealants & ElastomersPrinting & Packaging UV Protection & StabilizationAntioxidant & StabilizerFlavoring & AcidulantPreservation & Biocide
Description
4-tert-Octylphenol (CAS 140-66-9, EC 205-426-2), also known as PTOP or 4-t-Octylphenol, is a branched alkylphenol with molecular formula C14H22O. It carries no assigned E-code and is referenced in chemical databases under NSC 5427 and NSC 7248.
In polymer and coatings formulations, PTOP functions as an antioxidant and heat stabilizer by scavenging free radicals that initiate thermal degradation during processing. It also serves as a UV absorber in adhesives and sealants, interrupting photoinitiated oxidation chains to extend service life. In lubricant and metalworking fluids, it acts as a preservative against microbial and oxidative breakdown.
4-tert-Octylphenol is supplied as a white powder and is subject to REACH registration requirements within the EU. Procurement teams should note its SVHC candidate list status and verify compliance documentation prior to sourcing. HS code 29071300 applies for import and export classification purposes.
In polymer and coatings formulations, PTOP functions as an antioxidant and heat stabilizer by scavenging free radicals that initiate thermal degradation during processing. It also serves as a UV absorber in adhesives and sealants, interrupting photoinitiated oxidation chains to extend service life. In lubricant and metalworking fluids, it acts as a preservative against microbial and oxidative breakdown.
4-tert-Octylphenol is supplied as a white powder and is subject to REACH registration requirements within the EU. Procurement teams should note its SVHC candidate list status and verify compliance documentation prior to sourcing. HS code 29071300 applies for import and export classification purposes.
Physical Properties
| Melting Point | 84-85 °C |
| Boiling Point | 158 °C @ Press: 20 Torr |
| Density | 0.89 g/cm³ @ Temp: 90 °C |
| Flash Point | 145 °C |
| Appearance | white powder |
| Color | White flakes |
| Form | neat |
| Water Solubility | 7mg/L at 20℃ |
| Vapor Pressure | 2Pa at 38℃ |
| Refractive Index | 1.5003 (estimate) |
| Log P | 4.8 at 22℃ |
Safety & Handling (Learn More)
Danger GHS05 GHS09 GHS07 GHS08
H
H312H314H315H318H319H336H361H373H400H410
P
P203P260P261P264P271P273P280P316P317P318P319P321P363P391P405P501P264+P265P302+P352P304+P340P332+P317P337+P317P362+P364P403+P233P301+P330+P331P302+P361+P354P305+P351+P338P305+P354+P338
Trade & Regulatory
| HS Code | 29071300 |
| Storage Class | 3 - Flammable liquids |
| WGK (Germany) | 2 |
Other Names
4-(2,4,4-trimethylpentan-2-yl)phenol4-t-OctylphenolPTOPOCTYLPHENOL4-Octylphenolp-OctylphenolP-T-OCTYL PHENOL
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Raw Materials
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