In addition-cure silicone, specialty silicone resin and surface grafting, mono-vinyl silanes offer only single-point reaction, limiting crosslink symmetry; tetra-vinyl silane over-reacts into insoluble gel; hydride silicone oil as crosslinker lacks tunable flexible segment; common cyclosiloxanes need high-temp ring-opening with narrow process window. For specs demanding "dual vinyl precise reaction + low-boiling easy stripping + low-density high-volatility layout + strict DG control", a strictly controlled dimethyldivinylsilane welds bis-vinyl activity and silane backbone at one silicon node. Addressing this, Anhui IOTA Silicone Oil Co., Ltd. launches IOTA 501 Dimethylvinylsilane (Dimethyldivinylsilane). Alias bis(ethenyl)-dimethylsilane; SiMe₂(vinyl)₂. CAS 10519-87-6. Formula C₆H₁₂Si. MW 112.245. Exact mass 112.071. Appearance colorless liquid. Density 0.731 g/mL. Boiling point 79-82℃ (87.1℃ @760mmHg). Flash point -8℃. Refractive index 1.4187. Purity >98.0% GC. Applications: silicone industry additive; excellent cleaning effect on various oils; widely used in other industries. 25L plastic drum or 200L iron drum, transported as dangerous goods. Sealed shelf life 3 years. Brand IOTA. System Positioning: Dimethyldivinylsilane Among Vinyl Silane Families Within vinyl silanes, IOTA 501 is a dimethyl-divinyl substituted monomer, distinct from monovinyltrimethylsilane (mono-functional), tetravinylsilane (tetra-functional, gel-prone), vinyltrichlorosilane (corrosive HCl release), allyltrimethoxysilane (hydrolysis-type coupler, different path). IOTA 501 uses two vinyls as symmetric reactive anchors, two methyls stabilizing silicon center and lowering density, positioning as "addition LSR crosslink building block + specialty silicone resin monomer + surface grafting bis-linker + precision oil cleaner", rather than mere end-capper or hydrolyzable coupler. Molecular Architecture: One Si Two Methyls Two Vinyls + MW 112.245 + Density 0.731 + RI 1.4187 IOTA 501 core has silicon bonded to two methyls and two vinyls, formula C₆H₁₂Si. Symmetric bis-vinyl enables platinum-catalyzed hydrosilylation with Si-H to form stable Si-C bonds; also enters radical polymerization and cyclocopolymerization giving soluble linear polymers instead of crosslinked gel. Density only 0.731 g/mL, among the lightest silanes, indicates dense methyl packing and large free volume; RI 1.4187 low fits optical-clear systems; bp 79-82℃ moderate, easy to strip or recover after reaction, suiting residue-sensitive precision synthesis. Performance Leap: From "Mono-Vinyl Shallow, Tetra-Vinyl Violent" to "Bis-Vinyl Symmetric, Light-Volatile Controllable" With IOTA 501, four-way synergy: crosslink control—bis-vinyl enters platinum hydrosilylation with hydride silicone oil, building uniform 3D network with tunable density and even stress; mild polymerization—bis-vinyl under radical/coordination catalysis gives soluble linear polymer, avoiding insoluble gel of tetra-vinyl analog; surface grafting—one vinyl anchors to glass/silica via transition-metal catalysis, the other links functional organic molecules as dual-function tether; precision cleaning—low surface tension and low viscosity give outstanding degreasing, fast evaporation, minimal residue. Application Penetration: From Silicone Crosslink to Surface Grafting IOTA 501 covers four core scenarios.

• Addition LSR & silicone resin: LSR, vinyl silicone resin—bis-vinyl crosslink block; blend with hydride component and platinum catalyst, tune hardness/rebound.
• Specialty polymerization: functional polysiloxanes, cyclocopolymers—linear controllable polymerization; cyclocopolymerize with maleic anhydride etc. for specific topology.
• Surface grafting linker: glass, silica, solid supports functionalization—bis-vinyl division of labor; one end anchors carrier, one end binds functional molecule.
• Precision cleaning: mold, component degreasing—low-viscosity fast-strip; wipe or spray, evaporate clean.

⚠️ Taboo: flash point -8℃ extremely flammable, DG transport, keep from ignition, static, heat; flammable vapor, forced ventilation and explosion-proof electrics; vinyl reactive, avoid mixing with peroxides/strong acid-base; platinum system prevent S/P/amine poisoning; seal cool dark, avoid light and moisture, retest after 3 years if qualified. IOTA Technical Guide: 25L Plastic / 200L Iron Drum, Hazardous Management IOTA 501 is colorless liquid, standard 25L plastic drum or 200L iron drum. As crosslink monomer add per formula premixed with hydride component; as cleaner use as-is or diluted. Seal store cool ventilated, DG transport/storage, dark, anti-static, away from fire. Industry Insight: Bis-vinyl silane selection is not the more vinyl the better, but using bis-vinyl symmetry for crosslink uniformity, methyl density for volatility and density, boiling point for process recovery window, purity for batch activity. For silicone formulators and surface-functionalization engineers, IOTA 501 uses one dimethyldivinylsilane across crosslinking, polymerization, grafting and cleaning, taking dimethyl divinyl and silane light-volatile as batch-checkable anchors, securing reaction control and process safety simultaneously.