α,α,α',α'-tetramethyl-m-xylene-α,α'-diol

Density

Link to relevant study record(s)

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

Guideline:

OECD Guideline 109 (Density of Liquids and Solids)

Version / remarks:

July 1995

Deviations:

no

Qualifier:

according to guideline

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

Guideline:

EU Method A.3 (Relative Density)

Deviations:

no

Qualifier:

according to guideline

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 (cm^3)	Measured volume (cm^3)	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 (cm^3)	True density (g/cm^3)	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.