Registration Dossier

Physical & Chemical properties

Endpoint summary

Administrative data

Description of key information

The substance belongs to a group of Natural Complex Substances (NCS) : UVCB sub-type 3, where the source is biological and the process is refinement (See ECHA Guidance on Identification and naming of substances under REACH); such as: exudates, resinoids and concretes that are well-known to be very difficult to analytically assess. These complex UVCB substances contain a large number of constituents with different volatility and solubility (mostly low solubility); the composition can be widely unknown and their physical state ((mostly) solid(ish) and/or extremely viscous resins) leads to further difficulties for testing.

 

Considering the very complex nature of the test item (UVCB, a dark brown sticky high viscous resin in clumps in different sizes to solid, mainly composed of unknown constituents), physico-chemical properties of the registered substance were determined from experimental testing when possible. Some endpoints were waived, based on the experience in handling, testing and use of the substance and on the chemical structure of the known constituents. We also considered waiving based on the technical issues due to the complex nature of such UVCB substance especially when the information obtained from testing was not relevant or of practical use and irrelevant for subsequent assessments.

According to information available, no hazard was identified with regard to physical properties (flammability,explosivity, oxidising properties, self-heating substance) based on Regulation (EC) 1272/2008 (CLP regulation) and GHS.

Additional information

Summary of relevant physico-chemical properties:

Endpoint (method)

Data

Appearance at 20 °C and 1 atm. (visual)

Dark brown sticky high viscous resin in clumps in different sizes to solid

Note: according to observations reported during the relative density determination (see endpoint 4.4, Laus,2018), the test item is flowable at approximately 80°C.

Melting/Freezing point

(OECD 102/EU A1, DSC / capillary method)

study on-going

Boiling point

(OECD 103/EU A2, DSC / Cottrell method)

study on-going

Relative density

(OECD 109/EU A3, pycnometer method)

1.1278 ± 0.0003 g/cm3 at 20.0 ± 0.2 °C

D20/4 = 1.1278

Granulometry

(data waiving)

study scientifically not necessary (not granular / powder)

Vapour pressure

(OECD 104/EU A4,

static method)

study on-going

Note that the result obtained on this kind of substance should be largely influence by small amounts of volatile constituents and these values don't represent the major part of the substance. Therefore the result should be considered with caution when used for subsequent assessment (worst case).

log Kow 

(data waiving)

Waived based on technical issue and poor knownledge of the composition of the substance + disregarded study on similar substance, the Oakmoss concrete and QSAR estimation on known constituents of the registered substance.

Water solubility

(data waiving)

Waived considering the very complex nature of the test item, the information obtained from testing is considered as not relevant or of practical use for subsequent assessments

Surface tension

(data waiving)

Waived considering that surface activity is not the intended use of the substance (i.e. not a desired property).

Auto-Flammability

(data waiving)

Auto-ignition temperature waived because not technically feasible.

Self-ignition temperature waived based on MP<160°C

Flash-point

(EU A9) 

 

Flammability (N.1 readily combustible solids)

 

Flammability water&air

(data waiving)

 

Self-heating substances/mixtures (data waiving)

125.5°C at 1013 hPa => NOT classified under CLP & GHS.

Note that the result obtained on this kind of substance should be largely influence by small amounts of volatile constituents and the result doesn't represent the major part of the substance.

  

study on-going

Waived based on experience in handling, testing and use and chemical structure of known constituents of the substance.

NOT flammable if contact with air or water

Waived based on the physical state (solid with a low melting point < 160°C)

NO self-heating substance anticipated.

Explosive properties

(data waiving)

Waived based on experience in handling and use of the substance and chemical structure of known constituents.

LOW potential for explosive properties

Oxidising properties

(data waiving)

Waived based on technical issue and chemical structure of known constituents of the substance.

LOW potential for oxidizing properties

Slight variations are possible with composition (UVCB substance).