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Auto flammability

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Endpoint:
auto-ignition temperature (liquids)
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Study period:
24 May 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Justification for type of information:
The information is derived from Terpineol Alpha. The read across rationale is presented in the Autoflammability Endpoint summary, including the accompanying file.
Reason / purpose:
other: read across
GLP compliance:
yes
Key result
Auto-ignition temperature:
275 °C
Atm. press.:
1 022 hPa
Conclusions:
The auto-ignition temperature of the Terpene Hydrocarbon Alcohols was determined to be 275°C (at 1022 hPa) using read across from Terpineol alpha.
Endpoint:
auto-flammability
Type of information:
experimental study
Adequacy of study:
key study
Study period:
From 21 September 2012 to 22 October 2012
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP-compliant guideline study.
Qualifier:
according to
Guideline:
EU Method A.15 (Auto-Ignition Temperature (Liquids and Gases))
Qualifier:
according to
Guideline:
other: Deutsches Institut für Normung (DIN), DIN Guide 51794: "Determining the Ignition Temperature of Petroleum Products", May 2003.
Qualifier:
according to
Guideline:
other: International Electrotechnical Commission (IEC), IEC standard 79-4: "Electrical Apparatus for Explosive Gas Atmospheres, Part 4, Method of Test for Ignition Temperature", 1975.
GLP compliance:
yes
Key result
Auto-ignition temperature:
275 °C
Atm. press.:
994.1 hPa
Remarks on result:
other:

Preliminary test:

The estimated auto-ignition temperature was 285°C.

Main test:

Ignition of the test substance within 5 minutes after introduction was observed with each sample volume and with each test a minimum auto-ignition temperature was obtained. The maximum deviation between the three values was <10 °C. According to the guidelines, no further testing was required.

The lowest temperature at which ignition of the test substance occurred was 278°C. This temperature was rounded down to the nearest multiple of 5°C giving an auto-ignition temperature of the test substance of 275°C.

Conclusions:
The auto-ignition temperature of the test substance is 275°C at 994.1 hPa (atmospheric pressure).
Executive summary:

The autoignition temperature of alpha-Terpineol was determined in a GLP-compliant study according to EC guideline A.15. The lowest temperature at which ignition of the test substance occurred was 278°C at atmospheric pressure (994.1 hPa).

Description of key information

The autoflammability is 275oC based on read across from Terpineol alpha, the rationale is presented below.

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:
275 °C

Additional information

Auto-flammability of Terpene Hydrocarbon Alcohols using read across from alpha Terpineol.

Introduction

Terpene hydrocarbon alcohols have the followingconstituent types of substances: Solely hydrocarbons-terpene type, Alcohol-type, Ketone-type and Ether-type all having a saturated or unsaturated cyclic hydrocarbon backbone.There is no experimental auto-flammability information available. According to REACH Annex XI 1.5, information can be generated by other means, i.e. applying alternative methods such as QSARs, grouping and read-across. The autoflammability information of alpha-Terpineol is used for read across.

Hypothesis: Terpenes hydrocarbon alcohols have the same auto-flammability as alpha-Terpineol.

Available information: Alpha-Terpineol is tested in an A15 (Rel. 1) test and has an experimental auto-flammability temperature of 275oC.

Target chemical and source chemical(s)

Chemical structures of the target chemical and the source chemical(s) are shown in the data matrix, including relevant physico-chemical properties.

Purity / Impurities

Not relevant.

Analogue justification

According to Annex XI 1.5 read across can be used to replace testing when the similarity can be based on a common backbone and a common functional group. When using read across the result derived should be applicable for C&L and/or risk assessment and it should be presented with adequate and reliable documentation, which is presented below.

Analogue selection: For Terpene hydrocarbon alcohols the substance alpha-Terpineol is selected as the major representative constituent and because auto-flammability information was readily available.

Structural similarities and differences: Alpha-Terpineol is an alcohol which represents the major part of the Terpene Hydrocarbon alcohols.

Physical chemical properties: For liquids the boiling point and flashpoint are the key features for flammability. Both these properties are similar for Terpene hydrocarbon alcohols and alpha-Terpineol: the boiling points are 207.8 and 218.9oC, respectively and flashpoints are 77 and 91oC, respectively. Based on these similarities for Terpenes Hydrocarbon Alcohols a similar auto-flammability as for alpha-Terpineol can be predicted and results in a value of 275oC.

Uncertainty of the predictions: There are no uncertainties other than those addressed above.

Conclusion on hazard

For Terpene hydrocarbon alcohols no experimental information is available for auto-flammability but for alpha-Terpineol, the major constituent, such information is available: 275oC, which can be used for read across.

Final conclusion: Terpene hydrocarbon alcohols have an auto-flammability of 275oC.

 

Data matrix: Terpene hydrocarbon alcohols’ characteristics and expected autoflammability supported with experimental data from alpha-Terpineol

 Common names

Terpene hydrocarbon alcohols

Alpha-Terpineol

(representative constituent)

 

Target

Source

Chemical structures

Not applicable

CAS no.

Not applicable

95-55-5

Empirical formula

Not applicable

C10H18O

EINECS

945-149-0

202-680-6

REACH Registration

2018

2013

Molecular weight

136-154

154

Phys-Chem

 

 

Physical state

Liquid

Liquid

Boiling point oC

207.8

218.9

Vapour pressure in Pa

51.9

6.48

Flashpoint oC

77

91

Viscosity mPa

10.4

37.9

Auto-flammability (°C)

275 (Read across)

275 (A.15)