butyl 4-hydroxybenzoate

Flammability

Administrative data

Endpoint:

flammable solids

Type of information:

experimental study

Adequacy of study:

key study

Study period:

20 Nov 2017

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

test procedure in accordance with national standard methods with acceptable restrictions

Remarks:

VDI 2263

Cross-reference

Reason / purpose for cross-reference:

reference to other study

Reference

Endpoint:

self-heating substances / mixtures

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 completely molten at 160°C

Reason / purpose for cross-reference:

reference to other study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2017

Report date:

2017

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

other: VDI 2263: Test Methods for the Determination of the Safety Characteristics of Dusts

GLP compliance:

no

Test material

Test material information

Constituent 1

Reference substance name:

Butyl 4-hydroxybenzoate

EC Number:

202-318-7

EC Name:

Butyl 4-hydroxybenzoate

Cas Number:

94-26-8

Molecular formula:

C11H14O3

IUPAC Name:

butyl 4-hydroxybenzoate

Results and discussion

Flammable solids

Flammable solids 1

Test procedure:

other: combustion test at room temperature to determine burning behaviour

Remarks on result:

other: sample melted

Flammable solids 2

Test procedure:

other: combustion test at room temperature to determine burning behaviour

Remarks on result:

other: test item with Kieslguhr could only be ignited locally, little spreading of combustion

Remarks:

Burning rate test not necessary

Any other information on results incl. tables

Safety-related Parameter
The results of the experimental investigations to determine the safety-related parameters are summarized.

Burning behavior
Using an ignition source (flame or hot wire, holding time of the flame 2 minutes) at room temperature, the test item could not be ignited. No spreading of combustion was detected

The sample did melt when applying the ignition source (flame or hot wire).

The investigation at an elevated temperature (100 °C) could not be carried out because the melting point of the substance is < 100 °C.

Using an ignition source (flame or hot wire, holding time of the flame 2 minutes) at room temperature and at an elevated temperature of 100 °C, the test item in mixture with Kieselguhr could only be ignited locally, with little spreading of the combustion.

Due to the fact that the test item did not show combustion at room temperature, the determination of the burning rate was not necessary.

Self-ignition in the Grewer-oven
In the investigation of self-ignition in the Grewer-oven initially an endothermic process was seen for the pure test item and the test item mixture with Kieselguhr in the temperature range of 50 to 70 °C. A second endothermic effect was seen for the pure test item and the test item in mixture with Kieselguhr in the temperature range of 200 to 230 °C.

 

 

Table 2 – Results on the screening test on self-ignition in the Grewer-oven

Experiment	Onset self-ignition [°C]	Maximum sample temperature [°C]
Pure test item	-	-
Test item in mixture with Kieselguhr (1:1)	-	-

 

Assessment
Burning behavior
The burning number of the test item at room temperature was determined to be BZ 1 (no ignition).

In mixture with Kieselguhr at room temperature and at an elevated temperature of 100 °C a burning number of BZ 3 (localized combustion or glowing with practically no spreading) was determined.

Therefore, the test item is classified as follows:

UN Transport Regulation: The test item does not have to be classified as readily combustible solid in class 4, division 4.1 according to the UN Transport Regulation.

GHS/CLP Regulation EC 1272/2008 Annex 1: 2.7: The test item does not have to be classified as flammable solid according to GHS or CLP Regulation EC 1272/2008 Annex 1:2.7, respectively.

Self-ignition
Up to the final temperature of the investigation of about 400 °C, the sample showed no exothermic processes.

For the determination of a safe temperature for handling the test item under air, it is resorted to the onset-temperature of an exothermic process. In the present case, no exothermic process is detected up to the final temperature of 400 °C. Thus, the maximum temperature of the test of 400 °C minus a safety margin of 100 °C is used as safe handling temperature under air. In the present case, the maximum temperature for safe handling is 300 °C.

Due to this result, the test item is classified as follows:

UN Transport Regulation: The test item does not have to be classified as self-heating substance in class 4, division 4.2 according to the UN Transport Regulation.

GHS/CLP Regulation EC 1272/2008 Annex 1: 2.11: The test item does not have to be classified as self-heating substance according to GHS or CLP Regulation EC 1272/2008 Annex 1: 2.11, respectively.

Classification
Table 3 – Classifications

	Un Transport Regulation	GHS/CLP EC1272/2008
Burning behavior	Not classified in class 4, division 4.1 as readily combustible solid	Not classified as flammable solid
Self-heating	Not classified in class 4, division 4.2 as self-heating substance	Not classified as self-heating substance

 

Results
Table 4 – Results

Investigation	Result
Burning number BZ at room temperature	BZ 1
Burning number BZ of the test item in mixture with Kieselguhr -         At room temperature -         At 100 °C	BZ 3 BZ 3
Self-heating in the Grewer-oven, heating rate 1.2 K/min -         Pure test item -         Mixture with Kieselguhr	No self-ignition No self-ignition