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Density

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Reference
Endpoint:
relative density
Type of information:
experimental study
Adequacy of study:
key study
Study period:
March 2011
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Well conducted study under Internal Management System and according to EU and OECD guidelines.
Qualifier:
according to
Guideline:
OECD Guideline 109 (Density of Liquids and Solids)
Version / remarks:
July 1995
Deviations:
no
Qualifier:
according to
Guideline:
other: 4. ISO 1183-3, Plastics – Methods for determining the density of non-cellular plastics – Part 3: Gas pyknometer method, September 1999
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.3 (Relative Density)
Deviations:
no
Qualifier:
according to
Guideline:
other: DIN 51913, Testing of carbon materials – Determination of density by gas pycnometer (volumetric) using helium as the measuring gas – Solid materials, May 2001
Deviations:
no
GLP compliance:
no
Remarks:
Internal Management System
Type of method:
pycnometer method
Type:
relative density
Density:
1.184
Temp.:
20 °C
Remarks on result:
other: RSD 0.02%

Volatiles of α,α,α’,α’-tetramethyl-m-xylene-α,α-diol

 

Sample code

Sample weight

(g)

Sample weight after 24 hr at 40ºC

(g)

Volatiles

(% m/m)

1008570108-1

9.0430

8.5792

5.13

1008570108-2

8.5904

8.1611

5.00

1008570108-3

5.9950

5.7098

4.76

1008570108-4

7.3766

7.0139

4.92

 

 

Average

4.95

Control pycnometer

 

Control sample

Standard volume

(cm3)

Measured volume

(cm3)

Deviation

(%)

Temperature

(ºC)

St.0 (empty vial)

0.0000

-0.0024

-

20.0

Standard 135

6.3717

6.3716

-0.002%

20.0

 

Remark:           The measured volume of st 0 should be within 0.05% of full scale (10 cm3).

The measured volume of the Standard 135 should be within 0.01%.

  The true density of the samples was determined in duplicate per intake of dried sample.

True density of α,α,α’,α’-tetramethyl-m-xylene-α,α-diol

 

Sample code

Sample weight

(g)

Volume

(cm3)

True density

(g/cm3)

Temperature

(ºC)

1008570108-1

3.1187

2.6333

1.1843

20.0

2.6339

1.1841

20.0

1008570108-2

3.3135

2.7976

1.1844

20.0

2.7982

1.1842

20.0

1008570108-3

3.2580

2.7508

1.1844

20.0

2.7507

1.1844

20.0

1008570108-4

3.5341

2.9828

1.1848

20.0

2.9834

1.1846

20.0

 

The relative density (D420), is the ratio of the true densityof a material at a temperature of 20ºC and the density of water at a temperature of 4ºC (density = 0.999975g/cm3). The relative density has no dimension.

Relative density of α,α,α’,α’-tetramethyl-m-xylene-α,α-diol:

 

Sample

/

Relative density

α,α,α’,α’-tetramethyl-m-xylene-α,α-diol

Batch No.:1008570108

Average

1.1844

St. Dev.

0.0002

RSD (%)

0.02

Conclusions:
The relative density of α,α,α’,α’-tetramethyl-m-xylene-α,α-diol CAS no.1999-85-5 is 1.184 @ 20 oC.

Executive summary:

The relative density of α,α,α',α'-tetramethyl-m-xylene-α,α-diol was determined according to DIN 51913 and in accordance with European Chemicals Agency (ECHA), Guidance on information requirements and chemical safety assessment, Chapter R.7a, Endpoint specific guidance, May 2008.

The true density of the samples was determined in duplicate per intake of three dried sample.

Description of key information

The relative density of α,α,α’,α’-tetramethyl-m-xylene-α,α-diol  is 1.184.

Key value for chemical safety assessment

Relative density at 20C:
1.184

Additional information

This endpoint is supported by 1999-85-5, Density, Han, Zhejiang Chemical Industry Research Institute, 2011, SS:

The density of α,α,α',α'-tetramethyl-m-xylene-α,α'-diol is 1.192 g/cm³ at 20°C.