8.14051

Hexamethyldisiloxane

for synthesis

• Synonym(s): Hexamethyldisiloxane, 2,2,4,4-Tetramethyl-3-oxa-2,4-disilapentane, HMDSO
• Linear Formula: ((CH₃)₃Si)₂O
• CAS Number: 107-46-0
• Molecular Weight: 162.38
• MDL number: MFCD00008265
• UNSPSC Code: 12352103
• EC Index Number: 203-492-7
• NACRES: NA.22

Properties

• vapor pressure: 20 hPa ( 20 °C)
• Quality Level: 200
• Assay: ≥98.5% (GC)
• form: liquid
• autoignition temp.: 340 °C
• potency: >12160 mg/kg LD₅₀, oral (Rat); >2000 mg/kg LD₅₀, skin (Rat)
• expl. lim.: 0.5-21.8 % (v/v)
• bp: 100 °C/1013 hPa
• mp: -68 °C
• transition temp: flash point 4 °C
• solubility: insoluble 0.00037 g/L
• density: 0.76 g/cm³ at 25 °C
• storage temp.: 2-30°C
• InChI: 1S/C6H18OSi2/c1-8(2,3)7-9(4,5)6/h1-6H3
• InChI key: UQEAIHBTYFGYIE-UHFFFAOYSA-N

Description

Application

• Hexamethyldisiloxane coating by plasma to create a superhydrophobic surface for fabric masks: Research into the application of HMDSO plasma coatings to fabric masks to impart superhydrophobic properties, enhancing their resistance to moisture (Prado et al., 2022).
• PECVD of hexamethyldisiloxane coatings using extremely asymmetric capacitive RF discharge: Examines the deposition of HMDSO-based coatings via plasma-enhanced chemical vapor deposition, focusing on the influence of discharge asymmetry on the coating properties (Gosar et al., 2020).
• A ReaxFF-based molecular dynamics study of the pyrolysis mechanism of hexamethyldisiloxane: This study uses molecular dynamics to explore the pyrolysis processes of HMDSO, important for understanding its stability and decomposition under thermal stress (Chen et al., 2022).
• Thermal stability of hexamethyldisiloxane and octamethyltrisiloxane: Discusses the thermal stability of HMDSO compared to related siloxanes, providing valuable data for applications involving heat exposure (Keulen et al., 2018).

Analysis Note

Assay (GC, area%): ≥ 98.5 % (a/a)
Density (d 20 °C/ 4 °C): 0.762 - 0.764
Identity (IR): passes test

Safety Information

• Pictograms: GHS02,GHS09
• Signal Word: Danger
• Hazard Statements: H225 - H410
• Precautionary Statements: P210 - P233 - P240 - P241 - P242 - P273
• Hazard Classifications: Aquatic Acute 1 - Aquatic Chronic 1 - Flam. Liq. 2
• Storage Class Code: 3 - Flammable liquids
• WGK: WGK 2
• Flash Point(F): 21.2 °F - closed cup
• Flash Point(C): -6 °C - closed cup