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REACH

Magnesium metaborate

EC number: 237-235-5 | CAS number: 13703-82-7

Life Cycle description
Uses advised against

Physical & Chemical properties

Vapour pressure

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Administrative data

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2016-09-24 - 2017-02-03

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

Deviations:

Qualifier:

according to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

Deviations:

GLP compliance:

yes (incl. QA statement)

Remarks:

Department of Health of the Government of the United Kingdom

Type of method:

effusion method: vapour pressure balance

Key result

Temp.:

25 °C

Vapour pressure:

0.036 Pa

Temp.:

40 °C

Vapour pressure:

0.091 Pa

Temp.:

70 °C

Vapour pressure:

0.608 Pa

Preliminary Run

The recorded temperatures and the calculated vapor pressure values for the preliminary run are shown in the following table:

Table 2: Preliminary Run Vapor Pressure Data

Temperature (°C)	Temperature (K)	Vapor Pressure (Pa)	Temperature (°C)	Temperature (K)	Vapor Pressure (Pa)
20	293,15	0,028625843	46	319,15	0,111407560
21	294,15	0,027237587	47	320,15	0,118876378
22	295,15	0,027681829	48	321,15	0,127025442
23	296,15	0,028986789	49	322,15	0,138145374
24	297,15	0,030250103	50	323,15	0,144711826
25	298,15	0,031999305	51	324,15	0,155193160
26	299,15	0,033082145	52	325,15	0,165743908
27	300,15	0,035539359	53	326,15	0,178432569
28	301,15	0,035705949	54	327,15	0,191648768
29	302,15	0,039384828	55	328,15	0,205947807
30	303,15	0,041147914	56	329,15	0,217859045
31	304,15	0,042813821	57	330,15	0,216082077
32	305,15	0,045298800	58	331,15	0,233449162
33	306,15	0,048741675	59	332,15	0,245874055
34	307,15	0,052267846	60	333,15	0,267225436
35	308,15	0,055252597	61	334,15	0,282954378
36	309,15	0,059889372	62	335,15	0,300710175
37	310,15	0,061916226	63	336,15	0,323408164
38	311,15	0,065956052	64	337,15	0,346120035
39	312,15	0,071273073	65	338,15	0,366541284
40	313,15	0,074715949	66	339,15	0,397749283
41	314,15	0,079213899	67	340,15	0,429581998
42	315,15	0,087501788	68	341,15	0,454848261
43	316,15	0,092180212	69	342,15	0,489804552
44	317,15	0,099440792	70	343,15	0,527329117
45	318,15	0,105146524

Definitive Runs

The direct values of the vapor pressure at 25 °C are shown in the following table:

Table 3: Vapor Pressure Data at 25 °C

Run	Mass Difference (μg)	Vapor Pressure (Pa)
1	31,60	0,043868896
2	29,29	0,040662024
3	28,67	0,039801305
4	26,93	0,037385739
5	26,15	0,036302900
6	25,80	0,035817010
7	24,74	0,034345458
8	24,15	0,033526387
9	23,46	0,032568490
10	22,46	0,031180234

Mean vapor pressure at 25 °C: 0.0365 Pa

The test item did not change in appearance during the determination.

The direct values of the vapor pressure at 40 °C are shown in the following table:

Table 4: Vapor Pressure Data at 40 °C

Run	Mass Difference (μg)	Vapor Pressure (Pa)
1	79,42	0,110255307
2	72,68	0,100898461
3	71,33	0,099024315
4	66,95	0,092943752
5	66,43	0,092221859
6	63,79	0,088556863
7	62,15	0,086280123
8	60,16	0,083517493
9	58,06	0,080602155
10	57,94	0,080435564

Mean vapor pressure at 40 °C: 0.00915 Pa

The test item did not change in appearance during the determination.

The direct values of the vapor pressure at 70 °C are shown in the following table:

Table 5: Vapor Pressure Data at 70 °C

Run	Mass Difference (μg)	Vapor Pressure (Pa)
Run	Mass Difference (μg)	Vapor Pressure (Pa)
1	469,70	0,652063936
2	465,51	0,646247143
3	449,58	0,624132222
4	441,42	0,612804051
5	436,98	0,606640194
6	425,07	0,590106062
7	428,33	0,594631778
8	421,42	0,585038927
9	421,49	0,585136105
10	420,08	0,583178664

Mean vapor pressure at 70 °C: 0.608 Pa

Conclusion

The vapor pressure of the test item has been determined at three temperatures and the results are shown in the following table:

Temperature (°C)	Temperature (K)	Vapor Pressure (Pa)
25	298	3.65X10^-2
40	313	9.15X10-2
70	343	0,608

Conclusions:

The vapor pressure of the test item has been determined at three temperatures and the results are as follows:

25 °C 298 K 3.65X10-2 Pa
40°C 313 K 9.15X10-2 Pa
70°C 343 K 0,608 Pa

Executive summary:

The vapor pressure of the test item has been determined at three temperatures using the vapor pressure balance method, designed to be compatible with Method A.4 Vapour Pressure of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 104 of the OECD Guidelines for Testing of Chemicals, 23 March 2006.

The vapor pressure of the test item has been determined at three temperatures and the results are as follows:

25 °C 298 K 3.65X10-2 Pa

40°C 313 K 9.15X10-2 Pa

70°C 343 K 0,608 Pa

Description of key information

Method A.4 Vapour Pressure: 0.0365 Pa at 25 °C, 0.0915 Pa at 40 °C, 0.608 Pa at 70 °C

Key value for chemical safety assessment

Vapour pressure:: 0.036 Pa
at the temperature of:: 25 °C

Additional information

The vapor pressure of the test item has been determined at three temperatures and the results are as follows:

25 °C 298 K 3.65X10-2 Pa

40°C 313 K 9.15X10-2 Pa

70°C 343 K 0,608 Pa

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