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REACH

Magnesium hydroxide sulfate (Mg6(OH)10(SO4)), hydrate (1:3)

EC number: 483-390-9 | CAS number: 12508-61-1

Life Cycle description
Uses advised against

Physical & Chemical properties

Vapour pressure

Administrative data

Endpoint:: vapour pressure
Type of information:: experimental study
Adequacy of study:: key study
Study period:: 22 August 2006 and 21 September 2006.
Reliability:: 1 (reliable without restriction)
Rationale for reliability incl. deficiencies:: guideline study

Data source

Reference

Reference Type:: study report
Title:: Unnamed
Year:: 2006
Report date:: 2006

Materials and methods

Test guideline

Qualifier:: according to guideline
Guideline:: EU Method A.4 (Vapour Pressure)
Deviations:: no

GLP compliance:: yes (incl. QA statement)
Remarks:: Date of inspection: 30/08/05 Date of signature: 05/12/06
Type of method:: effusion method: vapour pressure balance

Test material

Test material information

Constituent 1

Reference substance name:: -
EC Number:: 483-390-9
EC Name:: -
Cas Number:: 12508-61-1
Molecular formula:: H16Mg6O17S
IUPAC Name:: hexamagnesium(2+) trihydrate decahydroxide sulfate

Results and discussion

Vapour pressure

: Key result
Temp.:: 25 °C
Vapour pressure:: < 0 Pa
Remarks on result:: other: The test material did not change in appearance under the conditions used in the determination.

Transition / decomposition

Transition / decomposition:: no

Any other information on results incl. tables

Run 1

Temperature (ºC)	Temperature (K)	Reciprocal Temperature (K^-1)	Mass Difference (µg)	Mass Difference (kg)	Vapour Pressure (Pa)	Log₁₀Vp
240	513.15	0.001948748	4.64	4.640E-09	0.006441509	-2.191012398
241	514.15	0.001944958	10.74	1.074E-08	0.014909872	-1.826526097
242	515.15	0.001941182	5.78	5.780E-09	0.008024121	-2.095602540
243	516.15	0.001937421	11.31	1.131E-08	0.015701178	-1.804067774
244	517.15	0.001933675	6.18	6.180E-09	0.008579423	-2.066541904
245	518.15	0.001929943	5.29	5.290E-09	0.007343875	-2.134074707
246	519.15	0.001926226	12.61	1.261E-08	0.017505911	-1.756815292
247	520.15	0.001922522	5.53	5.530E-09	0.007677057	-2.114805247
248	521.15	0.001918833	7.40	7.400E-09	0.010273096	-1.988298659
249	522.15	0.001915158	7.65	7.650E-09	0.010620160	-1.973868944
250	523.15	0.001911498	9.36	9.360E-09	0.012994078	-1.886254530

Run 2

Temperature (ºC)	Temperature (K)	Reciprocal Temperature (K^-1)	Mass Difference (µg)	Mass Difference (kg)	Vapour Pressure (Pa)	Log₁₀Vp
240	513.15	0.001948748	3.99	3.990E-09	0.005539142	-2.256557483
241	514.15	0.001944958	3.34	3.340E-09	0.004636776	-2.333783912
242	515.15	0.001941182	5.29	5.290E-09	0.007343875	-2.134074707
243	516.15	0.001937421	2.52	2.520E-09	0.003498406	-2.456129838
244	517.15	0.001933675	2.52	2.520E-09	0.003498406	-2.456129838
245	518.15	0.001929943	3.66	3.660E-09	0.005081018	-2.294049293
246	519.15	0.001926226	4.39	4.390E-09	0.006094445	-2.215065858
247	520.15	0.001922522	5.61	5.610E-09	0.007788117	-2.108567517
248	521.15	0.001918833	5.21	5.210E-09	0.007232815	-2.140692655
249	522.15	0.001915158	6.02	6.020E-09	0.008357302	-2.077933887
250	523.15	0.001911498	5.61	5.610E-09	0.007788117	-2.108567517

Run 3

Temperature (ºC)	Temperature (K)	Reciprocal Temperature (K^-1)	Mass Difference (µg)	Mass Difference (kg)	Vapour Pressure (Pa)	Log₁₀Vp
240	513.15	0.001948748	3.66	3.660E-09	0.005081018	-2.294049293
241	514.15	0.001944958	3.25	3.250E-09	0.004511833	-2.345647018
242	515.15	0.001941182	4.31	4.310E-09	0.005983384	-2.223053109
243	516.15	0.001937421	3.17	3.170E-09	0.004400772	-2.356471117
244	517.15	0.001933675	2.36	2.360E-09	0.003276285	-2.484618376
245	518.15	0.001929943	4.07	4.070E-09	0.005650203	-2.247935970
246	519.15	0.001926226	4.56	4.560E-09	0.006330448	-2.198565536
247	520.15	0.001922522	3.09	3.090E-09	0.004289712	-2.367571899
248	521.15	0.001918833	4.15	4.150E-09	0.005761263	-2.239482282
249	522.15	0.001915158	4.48	4.480E-09	0.006219388	-2.206252365
250	523.15	0.001911498	4.96	4.960E-09	0.006885751	-2.162048702

Run 4

Temperature (ºC)	Temperature (K)	Reciprocal Temperature (K^-1)	Mass Difference (µg)	Mass Difference (kg)	Vapour Pressure (Pa)	Log₁₀Vp
240	513.15	0.001948748	3.09	3.090E-09	0.004289712	-2.367571899
241	514.15	0.001944958	3.74	3.740E-09	0.005192078	-2.284658777
242	515.15	0.001941182	5.13	5.130E-09	0.007121754	-2.147413014
243	516.15	0.001937421	4.07	4.070E-09	0.005650203	-2.247935970
244	517.15	0.001933675	2.36	2.360E-09	0.003276285	-2.484618376
245	518.15	0.001929943	4.56	4.560E-09	0.006330448	-2.198565536
246	519.15	0.001926226	5.21	5.210E-09	0.007232815	-2.140692655
247	520.15	0.001922522	7.00	7.000E-09	0.009717793	-2.012432339
248	521.15	0.001918833	6.59	6.590E-09	0.009148608	-2.038644964
249	522.15	0.001915158	8.54	8.540E-09	0.011855708	-1.926072508
250	523.15	0.001911498	6.27	6.270E-09	0.008704366	-2.060262838

Run 5

Temperature (ºC)	Temperature (K)	Reciprocal Temperature (K^-1)	Mass Difference (µg)	Mass Difference (kg)	Vapour Pressure (Pa)	Log₁₀Vp
240	513.15	0.001948748	3.82	3.820E-09	0.005303139	-2.275467016
241	514.15	0.001944958	3.42	3.420E-09	0.004747836	-2.323504273
242	515.15	0.001941182	4.15	4.150E-09	0.005761263	-2.239482282
243	516.15	0.001937421	3.42	3.420E-09	0.004747836	-2.323504273
244	517.15	0.001933675	3.58	3.580E-09	0.004969957	-2.303647352
245	518.15	0.001929943	5.13	5.130E-09	0.007121754	-2.147413014
246	519.15	0.001926226	6.02	6.020E-09	0.008357302	-2.077933887
247	520.15	0.001922522	5.45	5.450E-09	0.007565996	-2.121133876
248	521.15	0.001918833	5.86	5.860E-09	0.008135181	-2.089632763
249	522.15	0.001915158	6.18	6.180E-09	0.008579423	-2.066541904
250	523.15	0.001911498	7.40	7.400E-09	0.010273096	-1.988298659

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 25ºC.

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 250ºC (523.15 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 25ºC gave a vapour pressure of 7.046 x 10^-5Pa which has been taken as a maximum for this material.

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 7.1 x 10-5 Pa at 25ºC.
Executive summary:: For substance MOS-HIGE in project number 1456 -0065, 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 of Commission Directive 92/69/EEC (which constitutes Annex V of Council Directive 67/548/EEC).The vapour pressure of the test material has been determined to be less than 7.1 x 10^-5Pa at 25ºC.

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