1-(2-methyl-4-(2-methylphenylazo)phenylazo)-2-naphthol

Density

Link to relevant study record(s)

Reference

Endpoint:

density, other

Remarks:

mean density

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2017-01-06 – 2017-01-06

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Justification for type of information:

Experimental result performed using standard methods of analysis

Qualifier:

according to guideline

Guideline:

OECD Guideline 109 (Density of Liquids and Solids)

Principles of method if other than guideline:

The density of chemical 1-(2-methyl-4-(2-methylphenylazo)phenylazo)-2-naphthol (CAS No. 85-83-6 ) was determined following OECD guideline 109 and according to the method adapted from ASTM D 854-02.

GLP compliance:

no

Type of method:

pycnometer method

Specific details on test material used for the study:

- Name of test material (as cited in study report): 1-(2-methyl-4-(2-methylphenylazo)phenylazo)-2-naphthol
- Molecular formula : C24H20N4O
- Molecular weight : 380.449 g/mol
- Substance type:Organic
- Physical state:Solid

Key result

Type:

density

Density:

1.331 g/cm³

Temp.:

20 °C

Remarks on result:

other: No other detail available

Method Details		Observations		Remarks if, any
Guideline	OECD 109	1^stReading	2^nd Reading
Method	Adapted from ASTM 854-02
Principle of method	The density of test item is determined by using pyknometer. It is the ratio of mass of the unit volume of test item at a stated temperature to mass of the same volume of gas free distilled water at a stated temperature.
Test temperature (°C)	-	20^oC	20^oC
Atmospheric pressure (in hPa)	-	977.4	977.6
Weight of empty dry pyknometer (Wp)		29.376	31.361
Weight of pyknometer filled with water (WA)		78.753	79.887
Weight of pyknometer + test Item (WPS)		34.250	36.185
Weight of pyknometer +test Item+ water (WB)		80.021	81.203

 

 

CALCULATIONS:

	Calculated values
	1^stCalculation	2^nd Calculation
Wo=WPS-WP	4.874	4.754
(WA-WB)	-1.268	-1.316
Density = WO/[WO+ (WA-WB)]	4.874/(4.874-3.268)	4.754/(4.754-1.316)
Specific Gravity; Gs	1.351	1.316
Density (g/cm³)	1.349	1.313

Conclusions:

The density of 1-(2-methyl-4-(2-methylphenylazo)phenylazo)-2-naphthol (CAS No. 85-83-6)was determined following OECD Guideline 109 and according to the method Adapted from ASTM D854-02 using glass pyknometer .The mean density of the test item was determined to be 1.331 g/cm³at 20°C and 977.5 hPa. .

Executive summary:

The density of 1-(2-methyl-4-(2-methylphenylazo)phenylazo)-2-naphthol (CAS No. 85-83-6)was determined following OECD Guideline 109 and according to the method Adapted from ASTM D854-02 using glass pyknometer .The mean density of the test item was determined to be 1.331 g/cm³at 20°C and 977.5 hPa.

Description of key information

The density of 1-(2-methyl-4-(2-methylphenylazo)phenylazo)-2-naphthol (CAS No. 85-83-6)was determined following OECD Guideline 109 and according to the method Adapted from ASTM D854-02 using glass pyknometer .The mean density of the test item was determined to be 1.331 g/cm³at 20°C and 977.5 hPa.

Key value for chemical safety assessment

Relative density at 20C:

1.331

Additional information

The density of 1-(2-methyl-4-(2-methylphenylazo)phenylazo)-2-naphthol (CAS No. 85-83-6)was determined following OECD Guideline 109 and according to the method Adapted from ASTM D854-02 using glass pyknometer .The mean density of the test item was determined to be 1.331 g/cm³at 20°C and 977.5 hPa.

other supporting study from authoritative database suggests that the density of chemical Scarlet red was determined to be 1.19±0.1 g/cm3  at 20°C and pressure 760 torr.

As the data from lab has K1 reliability and the test was performed using OECD guidelines which has the value of density as 1.331 g/cm3 thus considered as key study for the chemical safety assessment.