In paints, silicone rubbers and inorganic material interface modification, conventional tetraethyl orthosilicate (TEOS) offers high reactivity but overly fast ethoxy hydrolysis, short pot life, narrow application window and irritating volatiles; tetramethyl orthosilicate reacts even more violently and carries toxicity; mono-alkoxy or multi-functional silanes with mismatched carbon chains show poor organic compatibility and uncontrolled hydrolysis, causing local gel or incomplete coupling; common silicone oil additives only provide physical lubrication without chemical interfacial bonding. For specifications demanding "tetra-alkoxy, moderate hydrolysis rate, longer propyloxy chain, dual coupling-crosslinking function", a strictly controlled tetrapropoxysilane places controllable hydrolysis and interfacial bonding at one molecular node. Addressing this, Anhui IOTA Silicone Oil Co., Ltd. launches Tetrapropyl Orthosilicate IOTA 5064 (Tetrapropoxysilane, alias Tetrapropyl orthosilicate). Characterized by "molecular formula C₁₂H₂₈O₄Si, MW 264.43, CAS 682-01-9, EINECS 211-659-0; colorless liquid; boiling point 94℃ (5mmHg); refractive index 1.3995-1.4015; flash point 95℃; density 0.916; an important organosilicon coupling agent and crosslinker, widely used in paints, coatings, silicone rubber and inorganic material treatment; packaging 5KG/10KG/25KG/200KG plastic drum, other sizes by order; brand IOTA", backed by "tetrapropoxy + controlled hydrolysis + colorless low volatility", it serves as a tetra-alkoxy silane coupling-crosslinking agent for coatings, silicone and inorganic treatment. System Positioning: Tetrapropoxysilane Among Coupling/Crosslinking Agent Families Within silane coupling/crosslinking families, IOTA 5064 is a tetra-functional alkoxy silane of orthosilicate type, distinct from tetramethyl orthosilicate (too fast, toxic), tetraethyl orthosilicate (rapid ethoxy hydrolysis, shorter pot life), mono-functional alkoxy silicones (surface modification only, no crosslinking), vinyl/amino silanes (unsaturated or polar groups for specific resins). IOTA 5064 uses four propoxy groups for moderate hydrolysis rate and tetra-functional crosslink density; propyl chain longer than ethyl gives slower hydrolysis curve and better organic compatibility, positioning as a universal tetra-alkoxy crosslinker-coupler for "paint adhesion promotion + silicone rubber cure + inorganic surface hydrophobation/coupling", rather than a single-function silane. Molecular Architecture: Si(OC₃H₇)₄ Tetrahedron + Four Propoxy + Colorless Low Viscosity + Flash 95℃ IOTA 5064 has molecular formula C₁₂H₂₈O₄Si, with central silicon bonded to four n-propoxy groups (Si–O–C₃H₇). Propoxy carbon chain length makes hydrolysis significantly slower than ethoxy, granting longer pot life for coating and mixing; tetra-functionality gradually condenses in presence of catalyst or trace moisture to form 3D SiO₂ network for crosslinking or coupling; colorless liquid, density 0.916 for easy metering and pumping; refractive index 1.3995-1.4015 matches most organic coatings for transparency; boiling point 94℃ (5mmHg) indicates higher at atmospheric pressure, facilitating vacuum distillation purification; flash point 95℃ offers relatively safer storage, transportation and compounding; MW 264.43 enables precise molar equivalent calculation in formulations. Performance Leap: From "Ethoxy Too Fast, Short Pot Life" to "Tetrapropoxy Link, Crosslink Solid Base" With IOTA 5064, multiple systems improve jointly: controlled hydrolysis—propoxy hydrolyzes more gently than ethoxy, reducing premature gel in coating preparation and extending storage and application window; enhanced coupling—hydrolyzed silanols condense with inorganic substrate surface hydroxyls to form strong Si–O–M bonds, boosting paint adhesion to glass, metal, ceramics and water resistance; appropriate crosslinking—as crosslinker in silicone rubber, tetra-functional gradual propanol release forms uniform 3D network, improving cured mechanics and heat resistance; surface treatment—used for inorganic filler/fiber surface modification, hydrolyzed film lowers surface energy and improves organic-phase compatibility/dispersibility; safety—flash point 95℃, colorless low volatility, more favorable for occupational health than methyl/ethyl esters. Application Penetration: From Paint/Coating to Silicone Rubber and Inorganic Treatment IOTA 5064 covers three core scenarios. Paints and coatings: adhesion promoter for metal/glass/ceramic substrates—emphasizing interlayer bonding, water and salt-spray resistance; trial 0.5-2% addition. Silicone rubber: crosslinker for HTV or RTV—emphasizing cure rate and crosslink density control; trial by equivalent. Inorganic material treatment: filler surface modification, glass fiber coupling, stone/concrete protection—emphasizing dispersion and interface bonding; trial by specific surface area. ⚠️ Taboo: strictly keep from water, moist air and acid/base catalysts to prevent premature hydrolysis gel; reseal or nitrogen-purged after opening; store cool, dry, ventilated, away from sunlight; manage as general chemical, but flash 95℃ still combustible, keep from open flame. IOTA Technical Guide: Plastic Drum Pack, Water-Free Compounding, Cool Storage IOTA 5064 is a colorless liquid in 5KG/10KG/25KG/200KG plastic drums, other sizes by order. Dilute with suitable anhydrous solvent before use, blend with resin or rubber base in dry environment; add directly to paint mill base or let-down stage, or incorporate in silicone compounding at later mixing stage. Store in original sealed container, cool dry ventilated; shelf life per storage condition, FIFO recommended. Industry Insight: Orthosilicate selection is not the more functionality the better, but using alkoxy carbon chain length for hydrolysis rate and pot life, molecular weight and density for metering precision, flash point for safety class, refractive index for optical compatibility. For coating formulators, silicone engineers and inorganic treatment technicians, IOTA 5064 uses one CAS 682-01-9, MW 264.43, density 0.916, flash 95℃ tetrapropoxysilane across adhesion promotion, crosslink cure and surface coupling, taking tetrapropoxy linking, crosslink solid base and controlled hydrolysis as batch-checkable anchors, securing interfacial strength and process tolerance simultaneously.