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Physical & Chemical properties

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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 117

EU Method A.8

Pow = 2.0 x 10E3, log Pow = 3.3

HPLC 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