Typical Physical Properties of LS-622 Divinyltetramethyldisiloxane (Vinyl Double Head)
Silfluo Code: | LS-622 |
Chemical Name: Synonyms | Divinyltetramethyldisiloxane Tetramethyl divinyl disiloxane; Vi2MM |
CAS No.: EINECS No.: | 2627-95-4 220-099-6 |
Molecular Weight: | 186.40 |
Appearance: | Colorless or light yellow transparent liquid |
Purity (by GC, %) | 95.0 min |
The Vinyl Content: | ≥ 30% |
Density (ρ20°C, g/cm³) | 0.818 |
Refractive Index (n25/D) | 1.411-1.413 |
Boiling Point: | 139°C |
Flash Point: | 24 °C Closed Cup |
Water Solubility: | Insoluble |
Features of LS-622 Divinyltetramethyldisiloxane (Vinyl Double Head)
1. Highly Efficient Pot-Life Control: Acts as a premium linear inhibitor that effectively retards the room-temperature curing of two-part addition systems without permanently poisoning the platinum catalyst.
2. Controlled Volatility: With a boiling point of 139°C, it reliably volatilizes during the elevated-temperature curing phase, ensuring no residual inhibitor compromises the physical properties of the final elastomer.
3. Dual Vinyl Reactivity: Provides two highly accessible, unhindered terminal vinyl groups for rapid addition (hydrosilylation) reactions.
4. Ultra-High Purity: The strictly controlled purity (≥ 95.0%) ensures consistent, reproducible performance in highly sensitive catalytic syntheses.
Applications of LS-622 Divinyltetramethyldisiloxane (Vinyl Double Head)
1. Addition-Curing Silicone Inhibitor (RTV-2/LSR)
Widely utilized as a highly effective linear inhibitor in the formulation of two-part Addition-Curing Silicone RTVs and Liquid Silicone Rubbers (LSR). Due to its substantial vinyl concentration, very small amounts can drastically extend the working time (pot life) at ambient temperatures.
(Suggested starting formulation: Add 0.25 to 0.50 parts by weight of Silfluo LS-622 per 100 parts of the base polymer containing the platinum catalyst.)
2. Synthesis of Platinum Catalysts
Serves as the critical fundamental ligand and intermediate for synthesizing high-performance platinum complexes, specifically Karstedt's Catalyst, which is the global standard catalyst for addition-curing silicones.
3. Silicone Rubber & Gel Compounding
Used as a reactive additive and chain modifier in the processing of specialty addition-type silicone rubbers, vinyl silicone oils, and ultra-soft silicone potting gels for electronic encapsulation.
Packaging of LS-622 Divinyltetramethyldisiloxane (Vinyl Double Head)
In 160kg plastic lining iron drum
Safety and Storage of LS-622 Divinyltetramethyldisiloxane (Vinyl Double Head)
Keep in a cool and dry place and avoid storage in direct sunlight. Shelf life is min. 12 months. It is shipped as hazardous substance.
Find Other Types of Siloxanes & Silazane by CAS Number
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