8.14750

Octamethylcyclotetrasiloxane

for synthesis

• Synonym(s): Octamethylcyclotetrasiloxane, Octamethyltetrasiloxane
• Empirical Formula (Hill Notation): C₈H₂₄O₄Si₄
• CAS Number: 556-67-2
• Molecular Weight: 296.62
• MDL number: MFCD00003269
• UNSPSC Code: 12352103
• EC Index Number: 209-136-7
• NACRES: NA.22

Properties

• vapor pressure: 1.3 hPa ( 20 °C)
• Quality Level: 200
• assay: ≥98.0% (GC)
• form: liquid
• autoignition temp.: 400 °C
• potency: >2000 mg/kg LD₅₀, oral (Rat); >2400 mg/kg LD₅₀, skin (Rat)
• expl. lim.: 0.4-11.7 % (v/v)
• kinematic viscosity: 1.6 cSt(20 °C)
• bp: 176 °C/1013 hPa
• mp: 18 °C
• transition temp: flash point 51 °C
• solubility: <0.001 g/L (Hydrolysis)
• density: 0.95 g/cm³ at 25 °C
• storage temp.: 2-30°C
• InChI: 1S/C8H24O4Si4/c1-13(2)9-14(3,4)11-16(7,8)12-15(5,6)10-13/h1-8H3
• InChI key: HMMGMWAXVFQUOA-UHFFFAOYSA-N

Description

Analysis Note

Assay (GC, area%): ≥ 98.0 % (a/a)
Refractive index (n 25°/D): 1.394 - 1.395
Due to its specific melting range the product may be solid, liquid, a solidified melt or a supercooled melt.

Safety Information

• pictograms: GHS02,GHS08,GHS09
• signalword: Warning
• hcodes: H226 - H361f - H410
• pcodes: P202 - P210 - P233 - P240 - P273 - P308 + P313
• Hazard Classifications: Aquatic Acute 1 - Aquatic Chronic 1 - Flam. Liq. 3 - Repr. 2
• Storage Class: 3 - Flammable liquids
• wgk_germany: WGK 3
• flash_point_f: 123.8 °F - closed cup
• flash_point_c: 51 °C - closed cup