Octamethylcyclotetrasiloxane

CAS556-67-2

Octamethylcyclotetrasiloxane (CAS 556-67-2, C8H24O4Si4) is supplied by ChemSigma for research and manufacturing, with specification, analytical methods and batch documentation available on request.

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Chemical structure of Octamethylcyclotetrasiloxane
C8H24O4Si4 · 296.62 g/mol
CAS No.
556-67-2
Formula
C8H24O4Si4
Mol. weight
296.62 g/mol

Chemical Specifications

Identifiers

CAS number 556-67-2
Product name Octamethylcyclotetrasiloxane
Chinese name 八甲基环四硅氧烷
Synonyms DIMETHYLSILOXANE CYCLIC TETRAMER
Chinese synonyms 八甲基环四硅醚; 八甲基环四硅氧烷; 八甲基环四氧硅烷; 八甲基环十四硅氧烷; 甲基矽氧八環; 辛甲環四矽烷; 八甲环四硅氧烷 OCTAMETHYLCYCLOTETRASILOXANE; 八甲基硅油
Molecular formula C8H24O4Si4
Molecular weight 296.62 g/mol
EC number 209-136-7

Physical and chemical properties

Melting Point 17-18 ( ℃ )
Boiling Point 63.2 ( ℃ )

Applications

<TABLE style="TABLE-LAYOUT: fixed" border=0 cellSpacing=1 cellPadding=2 width="100%" bgColor=#d5d5d5> <TBODY> <TR class=ProdSupplierGN_ProductA_1> <TD class=td12>mp&nbsp;</TD> <TD bgColor=#fafafa><FONT color=#0066cc>17-18&nbsp;°C(lit.)<BR></FONT></TD></TR> <TR class=ProdSupplierGN_ProductA_2> <TD bgColor=#ffffff>bp&nbsp;</TD> <TD bgColor=#ffffff><FONT color=#0066cc>175-176&nbsp;°C(lit.)<BR></FONT></TD></TR> <TR class=ProdSupplierGN_ProductA_1> <TD class=td12>density&nbsp;</TD> <TD bgColor=#fafafa><FONT color=#0066cc>0.956&nbsp;g/mL&nbsp;at 25&nbsp;°C(lit.)<BR></FONT></TD></TR> <TR class=ProdSupplierGN_ProductA_2> <TD bgColor=#ffffff>vapor density&nbsp;</TD> <TD bgColor=#ffffff><FONT color=#0066cc>1 (vs air)<BR></FONT></TD></TR> <TR class=ProdSupplierGN_ProductA_1> <TD class=td12>refractive index&nbsp;</TD> <TD bgColor=#fafafa><FONT color=#0066cc><I>n</I><FRAC Type="vertical">20/D</FRAC> 1.396(lit.)<BR></FONT></TD></TR> <TR class=ProdSupplierGN_ProductA_2> <TD bgColor=#ffffff>Fp&nbsp;</TD> <TD bgColor=#ffffff><FONT color=#0066cc>140&nbsp;°F<BR></FONT></TD></TR> <TR class=ProdSupplierGN_ProductA_1> <TD class=td12>storage temp.&nbsp;</TD> <TD bgColor=#fafafa><FONT color=#0066cc>2-8°C</FONT></TD></TR> <TR class=ProdSupplierGN_ProductA_2> <TD bgColor=#ffffff>Water Solubility&nbsp;</TD> <TD bgColor=#ffffff><FONT color=#0066cc>INSOLUBLE</FONT></TD></TR> <TR class=ProdSupplierGN_ProductA_1> <TD class=td12>Sensitive&nbsp;</TD> <TD bgColor=#fafafa><FONT color=#0066cc>Moisture Sensitive</FONT></TD></TR> <TR class=ProdSupplierGN_ProductA_2> <TD bgColor=#ffffff>Merck&nbsp;</TD> <TD bgColor=#ffffff><FONT color=#0066cc>14,6747</FONT></TD></TR> <TR class=ProdSupplierGN_ProductA_1> <TD class=td12>BRN&nbsp;</TD> <TD bgColor=#fafafa><FONT color=#0066cc>1787074</FONT></TD></TR> <TR class=ProdSupplierGN_ProductA_2> <TD bgColor=#ffffff>CAS DataBase Reference</TD> <TD bgColor=#ffffff><A title="556-67-2(CAS DataBase Reference)" href="CAS_556-67-2.htm"><FONT color=#0066cc>556-67-2(CAS DataBase Reference)</FONT></A></TD></TR> <TR class=ProdSupplierGN_ProductA_1> <TD class=td12>NIST Chemistry Reference</TD> <TD bgColor=#fafafa><A title="Cyclotetrasiloxane, octamethyl-(556-67-2)" href="http://webbook.nist.gov/cgi/cbook.cgi?ID=556-67-2&amp;Units=SI"><FONT color=#0066cc>Cyclotetrasiloxane, octamethyl-(556-67-2)</FONT></A></TD></TR> <TR class=ProdSupplierGN_ProductA_2> <TD bgColor=#ffffff>EPA Substance Registry System</TD> <TD bgColor=#ffffff><A title="Cyclotetrasiloxane, octamethyl-(556-67-2)" href="http://iaspub.epa.gov/sor_internet/registry/substreg/searchandretrieve/advancedsearch/search.do?search=?search=&amp;searchCriteria(advancedCriteria)=casNumber=556-67-2"><FONT color=#0066cc>Cyclotetrasiloxane, octamethyl-(556-67-2)</FONT></A></TD></TR></TBODY></TABLE>

Packaging, Storage & Transport

Available pack sizes 5kg, 1kg, 500g, 100g, 50g, 10g

Read the current safety data sheet before handling. Packaging can be adapted to the order quantity and destination.

Frequently Asked Questions

What is the CAS number of Octamethylcyclotetrasiloxane?

The CAS Registry Number of Octamethylcyclotetrasiloxane is 556-67-2. Octamethylcyclotetrasiloxane is also known as DIMETHYLSILOXANE CYCLIC TETRAMER.

What is the molecular formula and molecular weight of Octamethylcyclotetrasiloxane?

The molecular formula of Octamethylcyclotetrasiloxane is C8H24O4Si4, and its molecular weight is 296.62 g/mol.

What is Octamethylcyclotetrasiloxane used for?

<TABLE style="TABLE-LAYOUT: fixed" border=0 cellSpacing=1 cellPadding=2 width="100%" bgColor=#d5d5d5> <TBODY> <TR class=ProdSupplierGN_ProductA_1> <TD class=td12>mp&nbsp;</TD> <TD bgColor=#fafafa><FONT color=#0066cc>17-18&nbsp;°C(lit.)<BR></FONT></TD></TR> <TR class=ProdSupplierGN_ProductA_2> <TD bgColor=#ffffff>bp&nbsp;</TD> <TD bgColor=#ffffff><FONT color=#0066cc>175-176&nbsp;°C(lit.)<BR></FONT></TD></TR> <TR class=ProdSupplierGN_ProductA_1> <TD class=td12>density&nbsp;</TD> <TD bgColor=#fafafa><FONT color=#0066cc>0.956&nbsp;g/mL&nbsp;at 25&nbsp;°C(lit.)<BR></FONT></TD></TR> <TR class=ProdSupplierGN_ProductA_2> <TD bgColor=#ffffff>vapor density&nbsp;</TD> <TD bgColor=#ffffff><FONT color=#0066cc>1 (vs air)<BR></FONT></TD></TR> <TR class=ProdSupplierGN_ProductA_1> <TD class=td12>refractive index&nbsp;</TD> <TD bgColor=#fafafa><FONT color=#0066cc><I>n</I><FRAC Type="vertical">20/D</FRAC> 1.396(lit.)<BR></FONT></TD></TR> <TR class=ProdSupplierGN_ProductA_2> <TD bgColor=#ffffff>Fp&nbsp;</TD> <TD bgColor=#ffffff><FONT color=#0066cc>140&nbsp;°F<BR></FONT></TD></TR> <TR class=ProdSupplierGN_ProductA_1> <TD class=td12>storage temp.&nbsp;</TD> <TD bgColor=#fafafa><FONT color=#0066cc>2-8°C</FONT></TD></TR> <TR class=ProdSupplierGN_ProductA_2> <TD bgColor=#ffffff>Water Solubility&nbsp;</TD> <TD bgColor=#ffffff><FONT color=#0066cc>INSOLUBLE</FONT></TD></TR> <TR class=ProdSupplierGN_ProductA_1> <TD class=td12>Sensitive&nbsp;</TD> <TD bgColor=#fafafa><FONT color=#0066cc>Moisture Sensitive</FONT></TD></TR> <TR class=ProdSupplierGN_ProductA_2> <TD bgColor=#ffffff>Merck&nbsp;</TD> <TD bgColor=#ffffff><FONT color=#0066cc>14,6747</FONT></TD></TR> <TR class=ProdSupplierGN_ProductA_1> <TD class=td12>BRN&nbsp;</TD> <TD bgColor=#fafafa><FONT color=#0066cc>1787074</FONT></TD></TR> <TR class=ProdSupplierGN_ProductA_2> <TD bgColor=#ffffff>CAS DataBase Reference</TD> <TD bgColor=#ffffff><A title="556-67-2(CAS DataBase Reference)" href="CAS_556-67-2.htm"><FONT color=#0066cc>556-67-2(CAS DataBase Reference)</FONT></A></TD></TR> <TR class=ProdSupplierGN_ProductA_1> <TD class=td12>NIST Chemistry Reference</TD> <TD bgColor=#fafafa><A title="Cyclotetrasiloxane, octamethyl-(556-67-2)" href="http://webbook.nist.gov/cgi/cbook.cgi?ID=556-67-2&amp;Units=SI"><FONT color=#0066cc>Cyclotetrasiloxane, octamethyl-(556-67-2)</FONT></A></TD></TR> <TR class=ProdSupplierGN_ProductA_2> <TD bgColor=#ffffff>EPA Substance Registry System</TD> <TD bgColor=#ffffff><A title="Cyclotetrasiloxane, octamethyl-(556-67-2)" href="http://iaspub.epa.gov/sor_internet/registry/substreg/searchandretrieve/advancedsearch/search.do?search=?search=&amp;searchCriteria(advancedCriteria)=casNumber=556-67-2"><FONT color=#0066cc>Cyclotetrasiloxane, octamethyl-(556-67-2)</FONT></A></TD></TR></TBODY></TABLE>

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