Octamethylcyclotetrasiloxane (D4)

Product Description

Name of commodity: Octamethylcyclotetrasiloxane
CAS No. 556-67-2
Molecular formular: (CH3)8Si4O4
Molecular weight: 296.8
Description of Danger: UN NO. 1993; Package category 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 oil-like liquid
pH Value: 6 Melting Point(C): 17.5
Relative Density(Water's=1): 0.96 Boiling Point(C): ≥ 175(101.3KPa)
Relative Density(Air's=1): - Pressure of Saturated Vapor(KPa): 0.1(20C)
Octanol/water distribution coefficient: -
Flash Point(C): 56 Ignation Temperature(C): -
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

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 used in rubber filler treatment or a new 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. Electrostatic force accumulates and may ignite inhalator. It is suggested to adopt measures such as grounding, parallel connection or innert gas protection to avoid potential fire danger.
Stability: Stable
Polymerized danger: Polymerization
Access prohibition: -
Banned articles: Oxidant can cause reaction.
Combustion(decomposition) products: Silicon dioxide, carbon dioxide and minimum incomplete combustion carbide and formaldehyde.

Package storage and transportation: It should be packed in 200L iron drum(net weight 200kg/drum) and be stored in a shady, cool and ventilated storehouse. It should be keep away from kindling; Temperatue in the storehouse above 30C is not suitable. Avoid direct sunlight. Air-proof package is required without contact with air. And it should be placed and stored far away from oxidant, acid and alkali. The installation of lighting and ventilation in the storehouse should be explosion-proof. Swithes must be located outside the house. Corresponding varied and quantitative fire fighting equipment should be equiped. Check regularly to make sure free of leakage. Operate and handle in nitrogen gas. When conveyig, take care of loading and unloading to avoid damages on package and vessels. A regulated route is required for transportation without changing the route or halting suddenly.

Quality gurantee period: Quality guarantee period for this product is 6 months. Recheck by this standard is required when the product exceeds the time limits. The product can be used only after the test result is qualified.