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EC number: 232-304-6
CAS number: 8002-26-4
A complex combination of tall oil rosin and fatty acids derived from acidulation of crude tall oil soap and including that which is further refined. Contains at least 10% rosin.
Since Distilled Tall Oil is a complex
mixture, two aspects need to be considered in relation to
physicochemical properties. In the context of raw material handling and
safe use it is important to understand the properties of the product as
An overview of the physicochemical
properties of the whole product is given in Section 1.3.2 while
physicochemical properties of the constituent blocks are given in
Physicochemical properties of whole
Table 1.8 of the chemical safety report
gives an overview of the physicochemical properties of the substance and
the evaluation undertaken for each endpoint.
is an amber to dark brown liquid at standard temperature and pressure.
The substance is a UVCB, variations in the physical appearance (colour
and viscosity) of the substance may occur depending on the natural
variation in composition of the substance.
freezing temperature of 253 K (-20.15°C) has been determined for DTO in
a GLP study according to OECD 102. DTO was observed to become
increasingly viscous during cooling.
boiling point of 634 K (360.85°C) at 99.14 kPa has been determined for
the substance in a GLP study in accordance to OECD 103. DTO is observed
to partially boil with decomposition.
density of 0.942 g/cm3 at 20.0 ± 0.5ºC has been determined
for DTO in a GLP study according to OECD 109. A value of 0.95 – 1.0 g/cm3
has been reported for the test substance in a pair reviewed
source. The substance has a density slightly less than that of water at
is a UVCB substance with varied composition. The vapour pressures of
constituents are described in 1.3.3. The vapour pressure of the
substance as a whole has been estimated using the method reported by PFA
2010b. A negligible vapour pressure of 0.00385 Pa at 25°C has been
determined for the registered substance.
aqueous solution surface tension value of 63.5 mN/m at 22°C has been
determined for DTO in a GLP study according to OECD 115. Distilled Tall
Oil is considered not surface active.
solubility has been determined in a GLP study for the test substance
using a method in accordance to OECD 105. DTO has a water solubility of
4.22 x 10-2g/L 20 °C, at pH 4 - 4.1. A water solubility of 9
mg/l is also reported for the test substance in its entirety as a
complex substance using the same method as stated above.
water solubility of samples of DTO with resin acid contents of 10 and
40% has been determined in accordance with OECD 105, respective values
of 8.4 mg/L and 8.7 mg/L have been determined for the samples at 20°C.
Distilled Tall Oil is considered slightly soluble. The water
solubilities of constituents are described in 1.3.3.
n-octanol/water partition coefficients of constituents of a sample of
DTO have been determined in accordance with OECD 117. The partition
coefficient at pH 2.0 was determined to be in the range log Kow =
4.9 – 7.7, in unbuffered conditions at pH 5 – 6, the log Kow
range was 3.2 – 6.8. The Kow values of
constituents are described in 1.3.3.
viscosity value of 111 mm2/s at 20°C (static) and 44.1 mm2/s
at 40°C (static) has been determined for DTO in a GLP study according to
measured data for dissociation constant of Distilled Tall Oil were
available. The pKa value (normal conditions) was predicted using SPARC.
the acids constituents (Fatty and Resin acids) group is ionisable,
neutrals constituents such as alcohols are extremely weak acids and only
dissociate under strongly basic conditions. In the range of pH usually
considered relevant to the human body and environment, i.e. pH 2-9, acid
constituents will ionise while the neutrals will be non-ionised.
flash point of 405°F (207.22°C) is reported for DTO using an open cup
(Cleveland) method according to Test Guideline D-803 ASTM (Drew and
substance is classified as not flammable or highly flammable on the
basis of a flash point of 405°F (207.22°C). Further detail is discussed
in section 6.2.
is not oxidising. Further detail is discussed in section 6.3 of the
chemical safety report.
is not explosive. Further detail is discussed in section 6.1 of the
chemical safety report.
The resultant properties for each block are
also shown in Table 1.9. Biodegradation and ecotoxicity properties are
covered in Sections 4 and 7 respectively.
Table 1.9: Properties of blocks for DTO
Vapour pressure at 25°C (Pa)
Water solubility at
HLC at 25°C (Pa.m3/mol)
Percentage block in substance
Low boiling fatty acids
C16 saturated - C18.3 unsaturated fatty acids
C18 saturated - C24 saturated and unsaturated fatty acids
Tetracosanol and dehydrated sterol
Sitosterols and analoque
refers to the log Kow of the non-ionised form, which is the
agreed convention; however, when necessary the data are used to estimate
Kow at pH 7 by standard
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