Siloxanes - Consumption, Toxicity and Alternatives - Miljøstyrelsen
Siloxanes - Consumption, Toxicity and Alternatives - Miljøstyrelsen
Siloxanes - Consumption, Toxicity and Alternatives - Miljøstyrelsen
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3 Health evaluation of siloxanes<br />
3.1 Data on toxicity of siloxanes<br />
Information about the toxicity of the siloxanes has been searched in open databases<br />
on the Internet <strong>and</strong> also as a general search based on CAS number,<br />
chemical name or just the term “siloxanes”, e.g. in combination with individual<br />
terms relevant to toxicity testing <strong>and</strong> results, using different search engines<br />
<strong>and</strong> meta search engines. Contacts to a few siloxane research university environments<br />
have pointed to the same literature as identified from searching the<br />
Internet.<br />
As a first step in the data search, a preliminary database screening was carried<br />
out for decamethyl cyclopentasiloxane (Annex 6).<br />
The data search has included the following general databases with information<br />
on chemical substances <strong>and</strong> their toxicological effects:<br />
• RTECS;<br />
• TOXNET: TOXLINE, CCRIS, HSDB, IRIS, GENE-TOX, DART /<br />
ETIC;<br />
• MEDLINE;<br />
• ScienceDirect (Journals);<br />
• NTP;<br />
• ASTDR.<br />
The screening did not reveal any data on human toxicity, <strong>and</strong> it was decided<br />
not to make similar screenings for other siloxanes, but instead make a short<br />
review based on the available original literature.<br />
The main source of information has been the Siloxane Research Program.<br />
The program is run by The Silicones Environmental, Health <strong>and</strong> Safety<br />
Council of North America (SEHSC) which is a non-profit trade association<br />
comprised of North American silicone chemical producers <strong>and</strong> importers.<br />
The programme was started in 1993 <strong>and</strong> includes a series of studies examining<br />
acute <strong>and</strong> long-term safety of exposure to the fundamental building blocks<br />
of many silicone materials (Meeks 1999). Testing under this programme includes<br />
the following type of tests:<br />
Fundamental research:<br />
• Pharmacokinetics;<br />
• Biochemical toxicology.<br />
Descriptive toxicological studies:<br />
• Subacute studies of up to one month of duration;<br />
• Subchronic studies of up to three months of duration;<br />
• Two-year chronic studies to assess carcinogenicity <strong>and</strong> chronic effects;<br />
• Developmental studies to assess effects on foetal development;<br />
• Two-generation reproductive <strong>and</strong> fertility studies;