Dimethylcyclosiloxane

Name of commodity:    Dimethylcyclosiloxane

CAS.NO.                        556-67-2

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

Molecular formula:   　［(CH₃)₂SiO］n   n=3-9    

Product standard:     Enterprise Standard Q/DYYJG1005-2007 Dimethylcyclosiloxane

                     National Standard GB/T 20436-2006 Dimethylcyclosiloxane              

Performance and technical indexes 

Appearance and properties: colorless transparent oily liquid.

P H Value: Neutral                       Melting Point(℃): —

    Relative Density (Water’s =1): 0.95-0.97     Boiling Point(℃):≥135

    Relative Density(Air’s =1) : —           Octanol/water distribution coefficient: —

Flash Point(℃): 56-57.8                  Ignition Temperature(℃): —     

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

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

Technical indexes     

Applications:  The primary material of high mol mass linear or crosslinking ploysiloxane products. It can produce three types of polymer products including silicone oil, silicone rubber, and silicone resin.

Hazard characteristics: It is flammable, it will produce carbon oxid and silicon dioxide when it burns and will decompose and produce formaldehyde when it heated to 200-300℃.Electrostatic force accumulates and may ignite inhalator. Hidden fire danger can be avoided by earth or inertia gas protection.

Stability:              Stable

Polymerized danger    Polymerization

Condition to avoid being contacted:    ——

Banned articles:   The oxidant can initiate reaction.

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.