Diisobutyl hydrogen phosphate

Flash point

Link to relevant study record(s)

Reference

Endpoint:

flash point of flammable liquids

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2020-07-09 - 2020-10-01

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.9 (Flash-Point)

Deviations:

no

Qualifier:

according to guideline

Guideline:

ISO 2719 (Determination of flash point - Pensky-Martens closed cup method)

Deviations:

no

Qualifier:

according to guideline

Guideline:

ISO 3679 (Determination of flash point - Rapid equilibrium closed cup method)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

closed cup

Flash point apparatus:

Pensky-Martens apparatus

Key result

Flash point:

> 155 °C

Atm. press.:

1 013 hPa

Remarks on result:

no flash point according to standard method

Flash Point according to Pensky-Martens

Since no ignition could be observed up to temperature of 147 °C  in the preliminary test further tests with the Rapid Tester were carried out for verification.

Main Test (Rapid Tester)

Due to the fact that no ignition could be detected in the preliminary test up to a temperature of 150 °C, verification measurements were carried out in a temperature range of 110 – 155 °C. For the verification measurement, about 4 mL of the test item were filled in a thin aluminium pan, which was placed into the test cup and heated to the desired temperature. Then the substance was maintained for 2 minutes at this temperature. The flame was dipped in the cup and it was checked if ignition occurred.

To verify that the test item has no flash point at least up to a temperature of 150 °C, verification measurements were carried out in a temperature range of 110 – 155 °C.

The test result of this test is presented in the following table. An ignition is indicated by “+” and no ignition by “-”.

Table 3:       Main test

Amount test item /mL	Temperature / °C	Ignition (+/-)	Air pressure / hPa	Remark
4	110.0	-	1000.5	---
4	115.0	-	1000.4	---
4	120.0	-	1000.5	---
4	125.0	-	1000.5	---
4	130.0	-	1000.5	---
4	135.0	-	1000.6	Ignition flame greenish at immersion
4	140.0	-	1000.7	Ignition flame greenish at immersion
4	145.0	-	1000.8	Ignition flame greenish at immersion
4	150.0	-	1001.0	Ignition flame greenish at immersion
4	155.0	-	1001.0	Ignition flame greenish at immersion

Since no ignition occurs at a temperature of 155 °C after tempering the test item for 2 min, the test item Diisobutyl phosphate has no flash point up to a temperature of 155 °C.

Interpretation of results:

GHS criteria not met

Conclusions:

The test item Diisobutyl phosphate has no flash point up to a temperature of 155 °C.

Executive summary:

The test item Diisobutyl phosphate has no flash point up to a temperature of 155 °C according to Regulation (EC) No 440/2008 Method A.9. Flash Point, DIN EN ISO 2719 (2016) and DIN EN ISO 3679 (2015), respectively.

According to the results of the test on the flash point, the test item is classified as follows:

UN Transport Regulation: With no measured flash point up to a temperature of 155 °C, the test item does not have to be classified as Flammable Liquid of Class 3.

GHS (CLP Regulation (EC) No 1272/2008 Annex I: 2.6): With no measured flash point up to a temperature of 155 °C, the test item does not have to be classified as Flammable Liquid.

Description of key information

Up to 155 °C at normal pressure (1013 hPa) no flashpoint could be detected.