p-benzoquinone dioxime

Appearance / physical state / colour

Link to relevant study record(s)

Reference

Endpoint:

appearance / physical state / colour

Type of information:

experimental study

Adequacy of study:

weight of evidence

Study period:

19-09-1991 to 16-10-1991

Reliability:

4 (not assignable)

Rationale for reliability incl. deficiencies:

other: Adequately documented guideline study performed, non-GLP. All relevant validity criteria were met. Testing conducted according to international transport and supply/use regulations and manual and criteria.

Reason / purpose for cross-reference:

reference to same study

Principles of method if other than guideline:

Visual observation of physical state and appearance by the testing laboratory.

GLP compliance:

yes

Specific details on test material used for the study:

The physical state and appearance of the test item were evaluated by visual observation. The test item was determined to be a light gray/brown powder.

Physical state at 20°C and 1013 hPa:

solid

Form:

solid: particulate/powder

Colour:

light gray/brown

Substance type:

organic

Conclusions:

The physical state and appearance of the test item were evaluated by visual observation. The test item was determined to be a light gray/brown powder.

Executive summary:

The appearance of the test item has been determined as:

Form: Solid (powder)

Colour: light gray/brown

Description of key information

weight of evidence: state of the substance at 20 °C and 101.3 kPa: light gray/brown or brown solid, powder visual observation, 2018

Key value for chemical safety assessment

Physical state at 20°C and 1013 hPa:

solid

Additional information

The weight of evidence is that the test item is a solid, and can be variously described as a brown powder (anon., 2018), a light gray/brown solid powder (anon., 1991) a dark gray to tan solid, and/or a grey to dark brown aqueous press-cake or dark brown powder (CRC, 1979 and IARC, 1982). The colour of the substance may vary in available sources. No significant odour has been reported in available sources. The different descriptions are dependent upon degree of processing and/or water content. Typically, the substance is a light gray/brown or brown solid (powdered solid or bulk solid).

 

The test item has a melting point of > 237 °C at ca. 101.3 kPa in an available melting point test to OECD TG 102 and EU Method A.1 under GLP. No definitive melting point or range could be determined based on test item decomposition at ca. 237 °C. The test item has not been observed or is not expected to be a liquid at < 20 °C.

 

The test item under the CLP Regulation (EC) 1272/2008: Annex 1, section 1 concerning the definition of gases, liquids and solids, does not meet the criteria as a gas or liquid. Therefore should be considered as a solid. For the classification procedure under Regulation (EC) 1272/2008 expert judgment indicates that the intrinsic properties of the test item indicate that the test item would be tested as a solid and for specific evaluations (e.g. Flammability – ‘pasty substances’) the test item would also generally be tested under the testing strategies concerning solids. As applicable.

 

References:

1. UN Transport of Dangerous Goods Manual of Tests and Criteria, Sixth Edition (2015)

2. ECHA Guidance on Information Requirements and Chemical Safety Assessment (Chapter R.7a: Endpoint Specific Guidance, July 2017)

3. REACH Regulation (EC) 1907/2006, Annex VII, section 7.1

4. CLP Regulation (EC) 1272/2008, Annex I, section 1

5. ECHA Guidance on Application on the CLP Criteria, section 2.0 (v5.0, July 2017)

6. Anon., Melting Point study, OECD TG 102, 2018

7. Anon., Flammable Solids study, UN Manual of Tests and Criteria: Test N.1, 1991

8. Weast, R.C., ed. (1979) CRC Handbook of Chemistry and Physics, 60th ed. page C-204

9. IARC monographs on the evaluation of the carcinogenic risk of chemicals to humans, volume 28 and 29, (1982)