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Octamethylcyclotetrasiloxane (OMCTS) Test Results


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CAS No. 556-67-2

ITC Recommendation/Designation - Fifteenth Report
49 FR 46931; November 29, 1984

Proposed Test Rule (PRM)
50 FR 45123; October 30, 1985

Consent Order (CO)
54 FR 818; January 10, 1989
The manufacturers of OMCTS

Modifications
56 FR 23228; May 21, 1991/Technical Amendment
57 FR 24958; June 12, 1992/Technical Amendment

Project Manager: M. Price, F. Benenati

Section Chief: N. Merrifield

Status: Closed. All required tests have been completed. Test results have been forwarded to the Risk Assessment Division for review and disposition. Attachment A for information on voluntary Product Stewardship Program activities relating to this chemical.

Identification of Chemicals

Octamethylcyclotetrasiloxane (OMCTS) is a silicone compound with a tetrameric structure. It is better known by industry as D4.

Announced Receipt of Test Data

Water solubility in fresh water and synthetic seawater (54 FR 51322; December 14, 1989).

Aquatic toxicity (rainbow trout) (55 FR 3482; February 1, 1990). The Silicones Health Council submitted: bioconcentration of 14C residues in fathead minnows (55 FR 19786; May 11, 1990).

Acute toxicity (sheepshead minnow, mysid shrimp, and daphnids), chronic toxicity (daphnids), and toxicity (freshwater Selenastrum capricornutum) (55 FR 22947; June 5, 1990).

The Silicones Health Council submitted a toxicity test with rainbow trout embryos and larvae (56 FR 5688; February 12, 1991), a subchronic toxicity test in midge larvae chironomus tetans under flow-through conditions (56 FR 20224; May 2, 1991), and a bioconcentration and elimination study using fathead minnows (56 FR 40614; August 15, 1992).

Results of Testing Table


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