2,5-di-tert-pentylhydroquinone

Endpoint summary

Additional information

The results of the physico-chemical properties of 2,5-di-tert-pentylhydroquinone (CAS no: 79-74-3, EC no: 201-222-2) are given below.

Parameter	Guideline(s)	Result	Comment
Appearance/physical state	No guideline followed	White to cream coloured powder or granular solid
Melting/freezing point	no guideline followed	The melting temperature of Lowinox® AH25 was determined using DSC. The melting temperature of the test substance is 181.34 °C.	Differential scanning calorimetry in air.
Boiling point	no guideline followed	The boiling temperature of Lowinox® AH25 was determined using DSC. The boiling temperature of the test substance is 325.7 °C.	Differential scanning calorimetry in air
Density	OECD Guideline 109 EU Method A.3	The density of the test substance at 20ºC was 1.045 g/cm3 (1.04 x 10E3 kg/m3). The relative density was 1.04.	Gas comparison pycnometer
Particle size distribution	No guideline followed	994.2% of Lowinox AH25 had a particle size of < 100 um, and 73.5% had a particle size < 40 um.	Dry sieve test
Vapour pressure	OECD Guideline 104 EU Method A.4	The vapour pressure of the test substance at 20°C (293K) was 7.55 x 10-5 Pa = 5.67 x 10-7 mm Hg.	Isothermal thermogravimetric effusion method
Partition coefficient	OECD Guideline 123	Kow = 1.4 x 10E+05, log Kow = 5.1	Slow Stir method
Water solubility	OECD Guideline 105 EU Method A.6	The water solubility of the test substance at 20°C was < 0.08 x 10-3 g/l. The pH of the aqueous samples was 7.5.	Column elution method
Surface tension	OECD Guideline 115 EU Method A.5		Waived
Flash point	EU Method A.9		waived
Auto flammability	United Nations (UN), UN no.ST/SG/AC.10/11/Rev.4: Recommendations on the Transport of Dangerous Goods, Part III: Classification Procedures, Test Methods and Criteria Relating to Explosives of Class 3, Class 4, Division 5.1 and Class 9, Test N.1, 2003.	Lowinox® AH25 is considered “not a self-heating substance”	Test 1 of the Modified Bowes-Cameron Cage test
Flammability	EU Method A.10 United Nations (UN), UN no.ST/SG/AC.10/11/Rev.4: Recommendations on the Transport of Dangerous Goods, Part III: Classification Procedures, Test Methods and Criteria Relating to Explosives of Class 3, Class 4, Division 5.1 and Class 9, Test N.4, 2003.	The preliminary screening test was performed for the determination of the flammability of Lowinox® AH25. Based on the results obtained, the test substance is considered ‘not highly flammable’.	Preliminary screening test
Flammability (Contact with water)	EU Method A.12 UN no.ST/SG/AC.10/11/Rev.4: Part III, Test N5, 2003 UN no.ST/SG/AC.10/11/Rev.4: Appendix 6, Screening procedures, 2003	Based on the evaluation of structural features, Lowinox® AH25 is considered ‘not highly flammable’ in contact with water.	statement
Pyrophoric Properties of Solids and Liquids	EU Method A.13 UN no.ST/SG/AC.10/11/Rev.4: Part III, Test N2, 2003 UN no.ST/SG/AC.10/11/Rev.4: Appendix 6, Screening procedures, 2003	Based on the evaluation of structural features, Lowinox®AH25 has no pyrophoric properties.	statement
Explosive properties	EU Method A.14	Based on the evaluation of the chemical structure and oxygen balance value of the substance, it is deemed not to be potentially explosive.	statement
Oxidising properties	EU Method A.17	Based on the evaluation of the chemical structure and oxygen balance value of the substance of interest, it is deemed not to be potentially oxidizing.	statement
Stability in organic solvents and identity of relevant degradation products			waived
Dissociation constant			waived
Viscosity			waived