If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/418/501/product-dating-information-06-25-mk.pdf
235709
Octamethyltrisiloxane
98%
Synonym(s):
1,1,1,3,3,5,5,5-Octamethyltrisiloxane, Dimethylbis(trimethylsiloxy)silane, Pentamethyl(trimethylsiloxy)disiloxane, Pentamethyl(trimethylsilyloxy)disiloxane
Select a Size
| Size/SKU | Availability | Price |
|---|---|---|
5 mL | Available to ship TODAY | $51.30 |
100 mL | Available to ship onSeptember 16, 2026fromMILWAUKEE | $286.00 $214.50 |
About This Item
$51.30
Available to ship TODAYDetails
vapor density
>1 (vs air)
Quality Segment
assay
98%
form
liquid
refractive index
n20/D 1.384 (lit.)
bp
153 °C (lit.)
mp
−82 °C (lit.)
density
0.82 g/mL at 25 °C (lit.)
SMILES string
C[Si](C)(C)O[Si](C)(C)O[Si](C)(C)C
InChI
1S/C8H24O2Si3/c1-11(2,3)9-13(7,8)10-12(4,5)6/h1-8H3
InChI key
CXQXSVUQTKDNFP-UHFFFAOYSA-N
General description
Application
1 of 1
This Item | |||
|---|---|---|---|
| description 98% | description viscosity 1.0 cSt (25 °C) | description 97% | description ≥97.0% (GC) |
| assay 98% | assay - | assay 97% | assay ≥97.0% (GC) |
| density 0.82 g/mL at 25 °C (lit.) | density 0.82 g/mL at 25 °C (lit.) | density 0.819 g/mL at 25 °C (lit.) | density 0.861 g/mL at 25 °C (lit.) |
| Quality Level 100 | Quality Level 100 | Quality Level 100 | Quality Level 100 |
| mp −82 °C (lit.) | mp −82 °C (lit.) | mp - | mp - |
| refractive index n20/D 1.384 (lit.) | refractive index n20/D 1.384 (lit.) | refractive index n20/D 1.382 (lit.) | refractive index n20/D 1.395 |
| bp 153 °C (lit.) | bp 153 °C (lit.) | bp 142 °C (lit.) | bp 86.5-87.5 °C/15 mmHg (lit.) |
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Signal Word
Danger
Storage Class
3 - Flammable liquids
WGK
WGK 3
Flash Point (°F)
84.2 °F - (External MSDS)
Flash Point (°C)
29 °C - (External MSDS)
PPE (personal protective equipment)
Eyeshields, Faceshields, Gloves, type ABEK (EN14387) respirator filter
Hazard Codes
Precautionary Statements
Hazard Classifications
Flam. Liq. 3 - vPvB
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How can I determine the shelf life / expiration / retest date of this product?
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How is shipping temperature determined? And how is it related to the product storage temperature?
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Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf
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