Octamethylcyclotetrasiloxane

Name of commodity:    Octamethylcyclotetrasiloxane

CAS.NO.                        556-67-2

Molecular formula:     (CH₃)₈Si₄O₄

Molecular mass:       296.6

Description of danger:   UN NO.1993,Package category No.Ⅲ

Product standard:      Enterprise Standard Q/DYYJG1006-2007 Octamethylcyclotetrasiloxane

                      National Standard GB/T 20435-2006 Octamethylcyclotetrasiloxane            

Performance and technical indexes  

Appearance and properties: colorless transparent oily liquid.

P H Value:7                           Melting Point(℃):17.5

Relative Density (Water’s =1):0.96        Boiling Point(℃):175(101.3kpa)

Relative Density(Air’s =1) : —          Pressure of Saturated Vapor(kpa):0.1(20℃)

Octanol/water distribution coefficient: 5.1  

Flash Point (℃): 56                    Ignition Temperature (℃): 400      

Upper Limit of Explosion［％(V/V)］: 11.7  Lower Limit of Explosion［％(V/V)］:0.4

Dissolubility: insoluble in water, soluble in organic solvent such as benzene etc.

Technical indexes     

Applications:  It will produce silicone high polymer from ring-opening reaction under catalyzing of acid or alkali, which is a basic material of silicone oil and silicone rubber and is also can be directly used in rubber filler treatment or a raw material for cosmetics.

Hazard characteristics: The mixture of vapor and air is explosive; Explosive mixture is formed by minute dispersed particulate matter in the Air’s. Electrostatic force accumulates and may ignite inhalator. Hidden fire danger can be avoided by earth, parallel connection or inertia gas protection.

Stability:    Stable

Polymerized danger:     Polymerization

Condition to avoid being contacted:   ——

Banned articles:     Oxidant

Decomposition Products:  silicon dioxide, carbon dioxide and minimum incomplete combustion carbide and formaldehyde.

Package storage and transportation: It should be packed in 200L iron bucket (net weight 180kg/bucket) and be stored in a shady, cool and ventilated storehouse. It should be kept away                   from kindling and heat source, temperature in the storehouse above 30℃ is not suitable. It should be put and stored in separate from oxidant, acid and alkali. Corresponding varied and quantitative fire fighting equipment should be equipped. Mechanical equipment and tools which are easy to produce sparks are prohibited to be used. When conveying, take care of loading and unloading to avoid damages on package and vessels.

Quality guarantee period: Quality guarantee period of this product is 6 months. Recheck by this standard is required when the product exceeds the time limit. The product can still be used only after the result of recheck is up to this standard..