Registration Dossier

Administrative data

Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
20 January 2009 to 12 March 2009
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Study conducted to GLP in compliance with agreed protocols with no deviations from standard test guidelines and/or minor methodological deficiences which do not affect the quality of the relevant results

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2009
Report Date:
2009

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
yes
Remarks:
No statistical analysis was performed because the balance readings were too low and variable for a line of best fit to have any meaning. Instead it was considered more appropriate to impose a regression slope on a chosen data point to provide an estimate
GLP compliance:
yes (incl. certificate)
Type of method:
effusion method: vapour pressure balance

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
- Name of test material (as cited in study report): INK BH11 M
- Substance type: dark red powder
- Lot/batch No.: MB-1A
- Storage condition of test material: room temperature in the dark

Results and discussion

Vapour pressure
Temp.:
25 °C
Vapour pressure:
< 0.001 Pa

Any other information on results incl. tables

No statistical analyses were performed because the balance readings were too low and variable for a line of best fit to have any meaning. Instead it was considered more appropriate to impose a regression slope on a chosen data point to provide an estimate of the maximum value for the vapour pressure at 25°C.   Run 5 was chosen because the sample had been under vacuum for the longest period prior to this run and so degassing would have been the most complete. The reading at 220°C (493.15 K) was chosen because this is the data point which gives the highest estimated vapour pressure at any given temperature when a slope of -1500 K is imposed upon it.   The value of -1500 K is an in-house value and is the shallowest slope observed whilst determining the vapour pressure on a wide range of samples using the vapour pressure balance method. Extrapolation to 25°C gave a vapour pressure of 6.276 x 104 Pa which has been taken as a maximum for this material.

Run 5

Temperature

(°C)

Temperature

(K)

Reciprocal

Temperature

(K)

Mass

Difference

(µg)

Mass

Difference

(kg)

Vapour

Pressure

(Pa)

Log10Vp

210

483.15

0.002069751

15.31

1.531E-08

0.021254202

-1.672555188

211

484.15

0.002065476

15.78

1.578E-08

0.021906683

-1.659423380

212

485.15

0.002061218

16.48

1.648E-08

0.022878462

-1.640573171

213

486.15

0.002056978

16.41

1.641E-08

0.022781284

-1.642421798

214

487.15

0.002052756

19.70

1.970E-08

0.027348647

-1.563064153

215

488.15

0.002048551

20.41

2.041E-08

0.028334309

-1.547687374

216

489.15

0.002044363

23.16

2.316E-08

0.032152014

-1.492791824

217

490.15

0.002040192

25.20

2.520E-08

0.034984056

-1.456129838

218

491.15

0.002036038

29.51

2.951E-08

0.040967440

-1.387561169

219

492.15

0.002031901

31.95

3.195E-08

0.044354786

-1.353059516

220

493.15

0.002027781

44.11

4.411E-08

0.061235981

-1.212993321

The test material did not change in appearance under the conditions used in the determination.

Applicant's summary and conclusion

Conclusions:
The vapour pressure of the test material has been determined to be less than 6.3 x 10-4 Pa at 25°C.
Executive summary:

In a determination of hazardous physico-chemical properties study (Harlan project number: 0959/0235) the substance is shown to have a vapour pressure of less than 1.3 x 10-4Pa at 25°C.

The vapour pressure was determined using a vapour pressure balance with measurements being made at several temperatures and linear regression analysis used to calculate the vapour pressure at 25°C. Testing was conducted using Method A4 Vapour Pressure of Council Regulation (EC) No 440/2008 of 30 May 2008.

 

The vapour pressure is related to the observed mass difference by the following equation:

 

Vp =δm.g/A

 

where:

 

Vp = vapour pressure (Pa)

δm = mass difference (kg)

g = acceleration dueto gravity (9.813 ms-2)

A = area of the orifice (7.06858x10-6m2)

 

No statistical analyses were performed because the balance readings were too low and variable for a line of best fit to have any meaning. Instead it was considered more appropriate to impose a regression slope on a chosen data point to provide an estimate of the maximum value for the vapour pressure at 25°C. The fifth run was chosen because the sample had been under vacuum for the longest period prior to this run and so degassing would have been the most complete. The reading at 220°C (493.15 K) was chosen because this is the data point which gives the highest estimated vapour pressure at any given temperature when a slope of -1500 K is imposed upon it.

  

The value of -1500 K is an in-house value and is the shallowest slope observed whilst determining the vapour pressure on a wide range of samples using the vapour pressure balance method.Extrapolation to 25°C gave a vapour pressure of 6.276 x 10-4Pa which has been taken as a maximum for this material