Benzenesulfonic acid, 4-mono-C20-24 (even numbered)-alkyl derivs., magnesium salts

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:

2012-10-23 - 2012-10-25

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: GLP Guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.9 (Flash-Point)

GLP compliance:

yes (incl. QA statement)

Remarks:

The Department of Health of the Government of the United Kingdom

Type of method:

closed cup

Key result

Flash point:

168 °C

Atm. press.:

ca. 99.6 kPa

Remarks on result:

other: Due to instrument failure, atm pressure was not recorded but is estimated.

Remarks:

Atm pressure is estimated as average of low and high over 12 mo period

Due to a failure in the instrument used to record the atmospheric pressure, the atmospheric pressure was not recorded during the determination of the flash point of the test item. Therefore, it was not possible to correct the observed flash point to standard pressure (101.325 kPa).

Historical data of atmospheric pressure at Harlan Laboratories in Shardlow, covering the period 02 January 2008 to 31 December 2008 was used to obtain the highest and lowest atmospheric pressure values over this period. The flash point was then corrected to standard atmospheric pressure, using the highest atmospheric value (95.79 kPa) and the lowest atmospheric pressure value (103.93 kPa). The resulting pair of corrected flash point values were within ± 2 °C of the observed flash point. Therefore, based on a review of historical atmospheric pressure data, and assuming the atmospheric pressure at the time of testing was comparable, it is considered that the flash point value is within the limits specified in the method.

Table 1. Results of the flash point determination

Temperature [°C]	Observations
24	No flash
29	No flash
34	No flash
29	No flash
44	No flash
49	No flash
54	No flash
59	No flash
64	No flash
69	No flash
74	No flash
74 (fresh sample)	No flash
79	No flash
84	No flash
89	No flash
94	No flash
99	No flash
104 (fresh sample)	No flash
109	No flash
114	No flash
119	No flash
124	No flash
129	No flash
134	No flash
139	No flash
144	No flash
149	No flash
154	No flash
154 (fresh sample)	No flash
159	No flash
164	A blue flash spread across the sample cup.
159 (fresh sample)	No flash
160	No flash
161	No flash
162	No flash
163	No flash
164	No flash
169	A blue flash spread across the sample cup.
164 (fresh sample)	No flash
165	No flash
166	No flash
167	No flash
168	No flash
169	No flash
174	A blue flash spread across the sample.
169 (fresh sample)	A blue flash spread across the sample.
165 (fresh sample)	No flash
166 (fresh sample)	No flash
167 (fresh sample)	No flash
168 (fresh sample)	A blue flash spread across the sample.
168 (fresh sample)	A blue flash spread across the sample.
166 (fresh sample)	No flash

Conclusions:

The study report describes a valid guideline study conducted under certificated GLP compliance. The flash point was determined as 168 °C (not corrected to standard pressure).

Executive summary:

The flash point of magnesium sulfonate target substance (CAS 231297-75-9) was determined using the closed cup method in accordance to EU Method A.9 (Tremain, 2012). For temperatures up to 100 °C, 2 mL of the test substance was transferred to the sample cup of a Setaflash point tester 30000-0. Above 100 °C, 4 mL of the test substance were applied. The sample was heated and allowed to equilibrate at the set temperature. The test flame was introduced into the sample cup for approximately 254 seconds by sliding the cup shutter open. Observations were made for ignition of the vapor. If no ignition occurred, the temperature was increased and the test flame re-introduced. This was repeated until the lowest reproducible temperature at which a flash occurred, using a fresh sample, was determined. The flash point is the lowest temperature at 101.3 kPa, at which the test liquid in a closed test vessel evolves vapors, under the conditions defined in the test method, in such amount that a flammable vapor / air mixture was produced in the test vessel. Due to an instrument failure the atmospheric pressure was not recorded, and therefore it was not possible to correct the observed flash point to standard atmospheric pressure. Therefore, it was not possible to correct the observed flash point to standard pressure (101.325 kPa).

Historical data of atmospheric pressure at Harlan Laboratories in Shardlow, covering the period 02 January 2008 to 31 December 2008 was used to obtain the highest and lowest atmospheric pressure values over this period. The flash point was then corrected to standard atmospheric pressure, using the highest atmospheric value (95.79 kPa) and the lowest atmospheric pressure value (103.93 kPa). The resulting pair of corrected flash point values were within ± 2 °C of the observed flash point. Therefore, based on a review of historical atmospheric pressure data, and assuming the atmospheric pressure at the time of testing was comparable, it is considered that the flash point value is within the limits specified in the method. As result, the flash point was determined as 168 °C.

Description of key information

EU Method A.9_Flash point: 168 °C

Key value for chemical safety assessment

Flash point at 101 325 Pa:

168 °C

Additional information

The key value was determined using the closed cup according to EU Method A.9 (Tremain, 2012).