1-(5,6,7,8-tetrahydro-3,5,5,6,8,8-hexamethyl-2-naphthyl)ethan-1-one

Density

Link to relevant study record(s)

Reference

Endpoint:

density

Remarks:

density

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Determination in-house at PFW (non-GLP).

Qualifier:

no guideline followed

Principles of method if other than guideline:

The density of the substance has been determined in its molten form. Therefore measuring-cylinders of 100 and 50 ml were weighted and subsequently filled with the molten substance (of 70 degrees Celsius) exactly to 100 or 50 ml. The measuring-cylinders with the substance were weighted again and the differences in weight were determined. This was done at room temperature without additional shaking of the measuring-cylinders. From the differences in weight and the volumes of the measuring-cylinders the average density of the molten substance was determined.

GLP compliance:

no

Type of method:

other: measuring-cylinders

Remarks:

measuring differences in weight and the volumes of measuring-cylinders with and without test item.

Key result

Type:

density

Density:

960 kg/m³

Temp.:

70 °C

Conclusions:

The relative density will be between the bulk density and its density in molten form: 600 < D < 960 kg/m3.

Executive summary:

The density of the substance has been determined in its molten form. Therefore measuring-cylinders of 100 and 50 ml were weighted and subsequently filled with the molten substance (of 70 degrees Celsius) exactly to 100 or 50 ml. The measuring-cylinders with the substance were weighted again and the differences in weight were determined. This was done at room temperature without additional shaking of the measuring-cylinders. From the differences in weight and the volumes of the measuring-cylinders the average density of the molten substance was determined: 960 kg/m3.

The relative density of the substance will be between its bulk density (see the other study record) and its density in molten form: 600 < D < 960 kg/m3.

Description of key information

The density of the substance has been determined by measuring the differences in weight and the volumes of measuring-cylinders when empty and when filled with the test item in its molten form, based on an in-house method. The relative density and the bulk density are 960 and 600 g/L respectively.

Key value for chemical safety assessment

Relative density at 20C:

0.96

Additional information

The difference in bulk and relative density differ considerable and is due to the production process of the test item. Since the test item melts around 54 °C, the relative density can be determined by melting the test item prior to the determination. Strictly speaking, the relative density should be between 600 and 960 g/L, but it should be closer to the molten density than to the bulk density. Hence the 960 g/L has been taken forward in the registration as the relative density. The relative density is less than one and the water-solubility of the test item is very low. Consequently, the substance is likely to float, which is relevant information for the risk assessment.