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EC number: 310-290-3
CAS number: 161907-80-8
A mixture of methyl borated glycol esters, with 44% B-TTEGME and 51% of their polyethylene glycol ethers was submitted to a valid GLP study to assess biodegradation (OECD 302 A). The results indicate 95% biodegradation within 3 days after incubation. According to the biodegradation criteria of the guideline, this finding provides evidence of ultimate biodegradation. The rapid degradation using non-adapted inoculum suggests the test material can be regarded as readily biodegradable. This is supported by an OECD 301A study with 88% pure B-TEGME (which forms 50% of B-TTEGME) which demonstrated ready biodegradability.
B-TTEGME is a mixture
of three borated glycol esters which differ solely by the length of
their "-CH2 -CH2 -O-" (glycol ether) side chains (homologues). Its major
components are B-TEGME (50%) and B-tetraEGME (40%). Their basic chemical
structure is identical: One boric acid molecule forms an ester with
three polyethylene glycol ethers of different chain length, i.e., either
three, four or five glycol ether entities. The following describes the
typical composition of B-TTEGME (CAS 161907-80-8):
50 % B-TEGME (CAS
30989 -05-0) – three polyethylene glycol ether moieties with 3 glycols
each (CAS 112 -35 -6)
40 % B-TetraEGME (CAS
57057-98-4) – three polyethylene glycol ether moieties with 4 glycols
each (CAS 237 -42 -8)
10 % B-PentaEGME (CAS
75672 -72-9) - three polyethylene glycol ether moieties with 5 glycols
each (CAS 23778 -52 -1)
Four studies are available to address the endpoint of B-TTEGME
Shell 1999 used a mixture of Methyl Borated Esters as test material,
containing 44% B-TTEGME, to conduct a valid GLP OECD 302 A study. The
purpose was to investigate the inherent biodegradability of the test
material. The results show that 95% of DOC was lost within latest 3 days
of incubation, providing evidence for ultimate biodegradation, according
to the criteria of OECD 302 A (> 70% loss during 28 days). Although the
test design allows the assessment of inherent biodegradability, the
rapid biodegradation (95% within 3 days) using non-adapted inoculum
suggests the test material can be regarded as readily biodegradable.
Ready biodegradation of borated glycol esters is supported by a ready
biodegradation study of B-TEGME, which contributes 50% of B-TTEGME. BASF
1999b represents a valid study and was conducted with 88% pure B-TEGME,
under GLP, and according to OECD 301A. It demonstrated that B-TEGME is
readily biodegradable. B-TEGME is a homologue to the two other borated
glycol esters of B-TEGME, namely B-TetraEGME (40% of B-TTEGME) and
B-PentaEGME (10% of B-TTEGME). Hence, the results obtained with B-TEGME
are considered relevant for the assessment of B-tetraEGME and
For the same reason the study of Shell 1986 provides evidence which
support the biodegradation of borated glycol esters. A DOT 4 brake fluid
was used in ready biodegradation testing.
The test material was a mixture of methyl and butyl borated esters,
i.e., 35% B-TTEGME, 48% of their respective polyethylene glycol ethers,
13% butyl glycol ethers and 3% additives (not specificied).
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