2,4,8,10-Tetraoxa-3,9-diphosphaspiro[5.5]undecane, 3,9-bis[2,4-bis(1,1-dimethylethyl)phenoxy]-

Modify Date: 2025-08-25 08:56:50

2,4,8,10-Tetraoxa-3,9-diphosphaspiro[5.5]undecane, 3,9-bis[2,4-bis(1,1-dimethylethyl)phenoxy]- structure	Common Name	2,4,8,10-Tetraoxa-3,9-diphosphaspiro[5.5]undecane, 3,9-bis[2,4-bis(1,1-dimethylethyl)phenoxy]-
	CAS Number	26741-53-7	Molecular Weight	604.694
	Density	N/A	Boiling Point	555.8±50.0 °C at 760 mmHg
	Molecular Formula	C₃₃H₅₀O₆P₂	Melting Point	160-178ºC
	MSDS	N/A	Flash Point	363.9±30.4 °C

Name	Antioxidant 24
Synonym	More Synonyms

Boiling Point	555.8±50.0 °C at 760 mmHg
Melting Point	160-178ºC
Molecular Formula	C₃₃H₅₀O₆P₂
Molecular Weight	604.694
Flash Point	363.9±30.4 °C
Exact Mass	604.308289
PSA	82.56000
LogP	11.76
Vapour Pressure	0.0±1.4 mmHg at 25°C

CHEMICAL IDENTIFICATION

RTECS NUMBER :: TG7400000

CHEMICAL NAME :: Phosphorous acid, cyclic neopentanetetrayl bis(2,4-di-tert-butylphenyl)ester

CAS REGISTRY NUMBER :: 26741-53-7

LAST UPDATED :: 199710

DATA ITEMS CITED :: 6

MOLECULAR FORMULA :: C33-H50-O6-P2

HEALTH HAZARD DATA

ACUTE TOXICITY DATA

TYPE OF TEST :: LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :: Oral

SPECIES OBSERVED :: Rodent - rat

DOSE/DURATION :: 5580 mg/kg

TOXIC EFFECTS :: Details of toxic effects not reported other than lethal dose value

REFERENCE :: EPASR* United States Environmental Protection Agency, Office of Pesticides and Toxic Substances. (U.S. Environmental Protection Agency, 401 M St., SW, Washington, DC 20460) History unknown. Volume(issue)/page/year: 8EHQ-1287-0706

TYPE OF TEST :: LC50 - Lethal concentration, 50 percent kill

ROUTE OF EXPOSURE :: Inhalation

SPECIES OBSERVED :: Rodent - rat

DOSE/DURATION :: >2 gm/m3

TOXIC EFFECTS :: Details of toxic effects not reported other than lethal dose value

REFERENCE :: EPASR* United States Environmental Protection Agency, Office of Pesticides and Toxic Substances. (U.S. Environmental Protection Agency, 401 M St., SW, Washington, DC 20460) History unknown. Volume(issue)/page/year: 8EHQ-1287-0706

TYPE OF TEST :: LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :: Administration onto the skin

SPECIES OBSERVED :: Rodent - rabbit

DOSE/DURATION :: >200 mg/kg

TOXIC EFFECTS :: Details of toxic effects not reported other than lethal dose value

REFERENCE :: EPASR* United States Environmental Protection Agency, Office of Pesticides and Toxic Substances. (U.S. Environmental Protection Agency, 401 M St., SW, Washington, DC 20460) History unknown. Volume(issue)/page/year: 8EHQ-1287-0706 *** NIOSH STANDARDS DEVELOPMENT AND SURVEILLANCE DATA *** NIOSH OCCUPATIONAL EXPOSURE SURVEY DATA : NOES - National Occupational Exposure Survey (1983) NOES Hazard Code - E0783 No. of Facilities: 66 (estimated) No. of Industries: 4 No. of Occupations: 8 No. of Employees: 3046 (estimated) No. of Female Employees: 2303 (estimated)

Hazard Codes	Xi

Pentaerythritol

CAS#:115-77-5

2,4-Di-t-butylphenol

CAS#:96-76-4

Phosphorus tric...

CAS#:7719-12-2

2,4,8,10-Tetrao...

CAS#:26741-53-7

Literature: Ciba-Geigy Corporation Patent: US4692540 A1, 1987 ;

Pentaerythritol

CAS#:115-77-5

2,4-Di-t-butylphenol

CAS#:96-76-4

~22%

2,4,8,10-Tetrao...

CAS#:26741-53-7

Literature: Rani, Manju; Shukla, Davender Kumar; Khan, Arif Ali Asian Journal of Chemistry, 2013 , vol. 25, # 8 p. 4556 - 4558

Precursor 3
CAS#:115-77-5 Pentaerythritol CAS#:96-76-4 2,4-Di-t-butylphenol CAS#:7719-12-2 Phosphorus tric...
DownStream 0

THP-24

EINECS 247-952-5

3,9-Bis[2,4-bis(2-methyl-2-propanyl)phenoxy]-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane

2,4,8,10-Tetraoxa-3,9-diphosphaspiro[5.5]undecane, 3,9-bis[2,4-bis(1,1-dimethylethyl)phenoxy]-

Alkanox-P-24

bis(2,4-Di-tert-butylphenyl)pentaerythritol diphosphite

3,9-Bis(2,4-di-tert-butylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane

ADK Stab PEP 24

Antioxidant AT-626

mark pep 24

Ultranox 626

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2,4,8,10-Tetraoxa-3,9-diphosphaspiro[5.5]undecane, 3,9-bis[2,4-bis(1,1-dimethylethyl)phenoxy]-

Names

Chemical & Physical Properties

Toxicological Information

CHEMICAL IDENTIFICATION

HEALTH HAZARD DATA

ACUTE TOXICITY DATA

Safety Information

Synthetic Route

Precursor & DownStream

Synonyms

The content on this webpage is sourced from various professional data sources. If you have any questions or concerns regarding the content, please feel free to contact service1@chemsrc.com.