Hydrogenated rosin, zinc salt

Auto flammability

Administrative data

Endpoint:

relative self-ignition temperature (solids)

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

the study does not need to be conducted because the substance is a solid having a melting point <= 160°C

Cross-reference

Reason / purpose for cross-reference:

read-across: supporting information

Reference

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

From 11 February 2016 to 13 June 2016

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Version / remarks:

2008

Deviations:

no

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Version / remarks:

1995

Deviations:

no

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7200 (Melting Point / Melting Range)

Version / remarks:

1998

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

Specific details on test material used for the study:

The test item is a complex substance with a resinlike appearance. Such substances typically liquefy slowly before glass transition.

Key result

Melting / freezing pt.:

>= 81 - <= 88 °C

Decomposition:

yes

Decomp. temp.:

> 325 °C

Remarks on result:

other: Glass transition instead of melting

 

DSC EXPERIMENT 1

A glass transition of the test item was observed between 50°C and 100°C. The inflection point of the peak was 87.57°C. Endothermic peaks were observed from 325°C; most likely due to reaction and/or decomposition of the test item. After the experiment, an orange molten residue remained in the sample container.

DSC EXPERIMENT 2

The temperature program was stopped directly after the glass transition. The inflection point was 85.84°C. After the experiment the sample appeared unchanged.

DSC EXPERIMENT 3

The temperature program was stopped at 300°C. The inflection point of the endothermic peak was 87.92°C. After the experiment, a liquefied light yellow residue remained in the sample container. Glass transition most probably influenced the opacity of the test item causing the colour change. The result demonstrated that the test item was already liquefied before the endothermic effect.

DSC EXPERIMENT 4

To investigate the glass transition between 50°C and 100°C a repeated heating cycle was applied. With the first heating the inflection point was 80.70°C. During cooling no effect was observed due to crystallisation of the test item. With the second heating glass transition at 84.89°C was obtained. This value is not representative for the original test item and therefore not used for the key result. After the experiment a liquefied light orange residue remained in the sample container.

KEY RESULT

The glass transition range was determined from Experiment 1 (87.57°C), Experiment 2 (85.84°C), Experiment 3 (87.92°C) and Experiment 4 (80.70°C).

 

Conclusions:

A glass transition range of 81 - 88°C was determined.

Executive summary:

Differential Scanning Calorimetry (DSC) experiments were performed in a GLP study according to EC A.1, OECD 102 and OPPTS 830.7200. Glass transition instead of melting was measured for the substance. From four experiments a glass transition range of 81 - 88°C was obtained. Reaction and/or decomposition was observed at temperatures above 325°C.