Trisodium bis[3-hydroxy-4-[(2-hydroxy-1-naphthyl)azo]naphthalene-1-sulphonato(3-)]chromate(3-)

Stability: thermal, sunlight, metals

Administrative data

Endpoint:

thermal stability

Type of information:

experimental study

Adequacy of study:

weight of evidence

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

study well documented, meets generally accepted scientific principles, acceptable for assessment

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1994

Report date:

1994

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

other: VDI 2263 Part 1

Principles of method if other than guideline:

Storage stability

GLP compliance:

no

Test material

Test material information

Constituent 1

Reference substance name:

Acid Blue 193

IUPAC Name:

Acid Blue 193

Results and discussion

Any other information on results incl. tables

Storage stability

The test substance showed a temperature rise of 7 K, at a storage temperature of 150 °C. The maximum was reached after 2.75 hours. Drying at a maximum temperature of 150 °C with a maximum residence time of 120 hours is possible if it is ensured that the temperature of 150 °C can not be exceeded.

Storage temperature	Amout	Exotherm reaction after storage of	Time after maximum reaction	Maximum temperature during the exothermy	Appearance of the sample
170 °C	400 ml	Directly	4.25 h	669 °C	White residue
160 °C	400 ml	Directly	3 h	175 °C	Unchanged
150 °C	400 ml	Directly	2.75 h	157 °C	Unchanged

Applicant's summary and conclusion

Conclusions:

The test substance showed a temperature rise of 7 K, at a storage temperature of 150 °C. The maximum was reached after 2.75 hours. Drying at a maximum temperature of 150 °C with a maximum residence time of 120 hours is possible if it is ensured that the temperature of 150 °C can not be exceeded.

Executive summary:

Storage stability was assessed in accordance with VDI 2263 Part 1. 400 ml of the substance sample were placed in a wire mesh basket under air flow of 100 l/h.

The sample temperature was measured using two thermocouples (sample center and side). The reference temperature was a thermocouple in the gas space of the furnace. All temperature values were recorded by computer system.

The test substance showed a temperature rise of 7 K, at a storage temperature of 150 °C. The maximum was reached after 2.75 hours. Drying at a maximum temperature of 150 °C with a maximum residence time of 120 hours is possible if it is ensured that the temperature of 150 °C can not be exceeded.