4-tert-butylpyrocatechol

Density

Link to relevant study record(s)

Reference

Endpoint:

relative density

Type of information:

experimental study

Adequacy of study:

key study

Study period:

report date: 2010-01-06

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: The study was conducted according to recognised guidelines.

Qualifier:

according to guideline

Guideline:

OECD Guideline 109 (Density of Liquids and Solids)

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.3 (Relative Density)

Deviations:

no

GLP compliance:

no

Type of method:

pycnometer method

Key result

Type:

relative density

Density:

1.08 kg/m³

Temp.:

20 °C

The measured values and the calculated provisional results are listed in the following Table 1.

Definition of terms:                  P = Pycnometer                   m = mass [g]

    T = Test item                       V = volume [mL]

     L = Liquid (water saturated in 4-TBC)

 

Table 1: Measured values and calculated provisional results

Assay n°	V (P) [cm^3]	m (P) [g]	m (P+T) [g]	m (T) [g]	m (P+T+L) [g]	m (L) [g]
1	9.634	18.9424	19.9411	0.9987	28.6081	8.6921
2	9.634	18.9983	19.9343	0.9360	28.6508	8.7418
3	9.634	18.9354	19.7487	0.8133	28.5970	8.8740

Formula:  m (T) = m (P+T) – m (P)

m (L) = m (P+T+L) – m (P+T)

V (L) = m (L) / Density (L)

V (T) = V (P) – V (L)      

The measured values of density of Liquid are listed in the following Table 2.

 

Table 2: Measured values of density of Liquid

Assay n°	V (P) [cm^3]	m (P) [g]	m (L+T) [g]	m (L) [g]	density (L) [g.cm^3]
1	9.634	18.9172	28.5408	9.6236	0.9989
2	9.634	18.9301	28.5420	9.6119	0.9977
3	9.634	18.9399	28.5410	9.6010	0.9966

The average density at 20°C (named Density (L)) of water saturated in 4-TBC is 997.7 kg.m^-3 ± 1.2 kg.m^-3.

The results are presented in the following Table 3.

 

Table 3: Results of density of 4-TBC

Assay n°	Density (T)[kg/m^3]	Relative density
1	1083.0	1.0831
2	1072.9	1.0729
3	1099.2	1.0992
Mean± Standard deviation	1085±12	1.085±0.012

 

Formula:    Density (T) [kg/m³] = (m (T) [g] / V (T) [cm³] x 1000 [kg.cm³.g^-1.m^-3]     

  Relative density = density [kg/m³] / 999.975 [kg/m³] (density of water at 4°C)

Conclusions:

The relative density of 4-TBC is 1.085 +/- 0.012.

Executive summary:

In a study (Processium, 2010), the relative density of 4 -tert-butylpyrocatechol was determined using a pycnometer method, according to the regulation (EC) n°440/2008, A.3, and to OECD Guideline N° 109.

The relative density of 4 -tert-butylpyrocatechol is 1.085 +/- 0.012 at 20°C+/- 0.5°C.

The study is classified as acceptable and satisfies the guideline requirements for a relative density study.

Description of key information

Relative density: 1.085 +/- 0.012 at 20°C

Key value for chemical safety assessment

Relative density at 20C:

1.085

Additional information

One experimental study (Processium, 2010) with reliability 1 according to Klimisch was available and was selected as key study. Relative density was determined according to the regulation (EC) n°440/2008, A.3.