In the polymer industrial filler spectrum, precipitated silica offers low cost but coarse particle size (>1μm), small surface area (<200m²/g), and only ~90% SiO₂ purity — limiting reinforcement in silicone rubber; carbon black reinforcement, while mature, brings dark-color contamination, failing light-color/transparent product requirements. Fumed silica is produced by high-temp hydrolysis of silicon tetrachloride in oxyhydrogen flame (SiCl₄+2H₂+O₂→SiO₂+4HCl), yielding amorphous nano white powder with 7-40nm primary particles, 200-500nm aggregates, 100-400m²/g surface area, SiO₂≥99.8%. Its abundant surface silanol groups build a 3D hydrogen-bond network in matrices, imparting "one-powder-multi-function" of reinforcement, thickening, thixotropy, anti-settling, anti-sagging, matting, and insulation. A380 grade (336-405m²/g) is the mainstream tier for high-performance rubber and coatings. As high-performance tires, engineering plastics, RTV/HTV silicone rubber, and premium coatings surge in dual demand for "light-color reinforcement + rheology control," sourcing a "GB/T 20020-2005 compliant, SiO₂≥99.8%, A380-grade surface area, domestically mass-producible" fumed silica has become the core proposition for localizing polymer industrial functional fillers.
Addressing this "micro-bone" pain point,
Anhui IOTA Silicone Oil Co., Ltd. (IOTA) officially launches
Fumed Silica IOTA 9001 (alias: Silica / Fumed Silica, CAS 7631-86-9). Characterized by "white powder, formula SiO₂, melting point 1710℃, relative density 2.2g/cm³(20℃), 45μm sieve residue ≤0.05%, slurry pH 3.6-4.5, 105℃ volatiles ≤3%, loss on ignition ≤2.5%, SiO₂≥99.8%, Al₂O₃≤500mg/kg, TiO₂≤300mg/kg, Fe₂O₃≤30mg/kg, carbon ≤0.2mg/kg, chloride ≤0.025%, 10kg/bag paper bag", mapped to A380 tier of GB/T 20020-2005 (surface area 336-405m²/g), and backed by "nano-SiO₂ primary particles + branched aggregates + silanol hydrogen-bond network," it serves as the "micro-bone powder" for rubber, plastics, coatings, adhesives, seals and other polymer industrial fields.
Molecular Architecture: Nano-SiO₂ Primary Particles + Branched Aggregates + Silanol H-Bond 3D Logic
The core competitiveness of IOTA 9001 stems from its "7-40nm spherical primary particles → fused branched aggregates → physically adsorbed flocculent agglomerates → silanol hydrogen-bond 3D network" precise hierarchical architecture:
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Nano Primary Particles: Halosilane hydrolyzed at high temp in oxyhydrogen flame yields 7-40nm spherical SiO₂ primary particles — extremely small size and huge surface area (A380: 336-405m²/g) — the physical basis of "small-size effect + high surface activity".
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Branched Aggregates: Primary particles collide and fuse near molten state in the reaction furnace, forming stable 3D branched aggregates (200-500nm); this fused structure is nearly inseparable, ensuring the filler's skeletal role in network construction.
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Silanol H-Bond Networking: Surface rich in isolated and bonded silanols (H-bonded silanols 28-35%); in liquid systems, builds a uniform 3D network via hydrogen bonds — the common cause of all reinforcement, thickening, thixotropy, anti-settling, anti-sagging performances.
Performance Leap: From "Inert Filler" to "Micro-Bone Multi-Functional Filler"
Incorporating IOTA 9001 enables qualitative leaps:
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Rubber Reinforcement: In RTV/HTV silicone rubber, 3-5% addition improves tear resistance by 40%+; vulcanizate tensile strength, tear strength, abrasion resistance, hardness rise synchronously; a renowned rubber manufacturer reported "30% strength increase in seals, significantly extended service life".
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Thickening & Thixotropy: H-bond network gives high viscosity at rest (anti-settle/anti-sag), collapses under shear (easy application), and self-heals after shear removal — classic "reversible thixotropy".
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Anti-Settling & Anti-Sagging: Forms uniform stable 3D network in coatings/adhesives, effectively preventing pigment settling and vertical-surface sagging.
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Matting & Insulation: Nano particles create micro-surface roughness for matte effect; SiO₂ itself provides excellent electrical insulation, enhancing electronic packaging reliability.
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High Purity & Heat Resistance: SiO₂≥99.8%, melting point 1710℃, minimal impurities (Al₂O₃/TiO₂/Fe₂O₃/carbon/chloride), ensuring stability in high-temp, high-insulation, food/pharma carrier scenarios.
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Vs IOTA 9120/PHPS: 9120 is organoborosilazane (pyrolysis-derived SiBCN ceramic precursor); PHPS is perhydro polysilazane (hydrolytic ceramicization inorganic coating precursor); 9001 is fumed silica (nano-SiO₂ powder functional filler) — together they form a "9120 liquid ceramic-blank precursor / PHPS inorganic ceramic precursor / 9001 micro-bone nano filler" material-form trio.
Application Penetration: From High-Performance Tires to Electronic Packaging
IOTA 9001 covers the full polymer industrial domain sensitive to "reinforcement + rheology control + light-color/transparent":
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Rubber Industry: High-performance tire reinforcement (wear resistance, lower rolling resistance), engineering plastic modification, seals and conveyor belts, specialty rubber products.
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Silicone Rubber: Core reinforcement filler for HTV/RTV silicone rubber, significantly improving tensile/tear/abrasion properties.
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Coatings & Inks: Thickening, thixotropy, anti-settling, anti-sagging, matting, enhanced scratch resistance and adhesion.
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Adhesives & Sealants: Rheology control and thixotropic agent, ensuring application performance and anti-collapse.
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Plastics: Engineering plastic reinforcement, free-flow regulation, anti-caking.
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Electronic Packaging: Improved insulation and device reliability.
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Pesticides & Cosmetics: Efficient pesticide carrier, safe cosmetic thickener and adsorbent.
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High-End Extensions: Dental material premium filler, catalyst carrier, semiconductor wafer polish agent, pharmaceutical tableting aid.
IOTA Technical Guide: Moisture-Proof Seal, Pre-Disperse to Slurry, Away from Oxidizers
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Dispersion Key: Fumed silica's huge surface area and high surface energy make it highly prone to agglomeration — must be pre-made into slurry before adding to the main system, avoiding simultaneous feeding with powders which leads to insufficient dispersion; only when the 3D network is fully formed can thickening/thixotropy/anti-settling reach full potential.
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Dosage Reference: Typical rubber reinforcement 3-5%; coating/adhesive rheology control tuned to desired viscosity — excess causes "livering" tendency.
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Taboo Red Line: Store in cool, dry, ventilated place, away from oxidizers — nano-SiO₂ is highly hygroscopic; moisture triggers premature H-bond networking at powder stage, causing dispersion difficulty and performance degradation; reseal immediately if paper bag is damaged.
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Storage: Paper bag, 10kg/bag; store in cool, dry, ventilated place, away from incompatible substances such as oxidizers; handle as general chemical, avoid dust inhalation, routine PPE.
Industry Expert Insight:
Industry experts note that fumed silica is "an extremely important high-tech ultra-fine inorganic new material," with global market growing ~6.8% annually, and A380-grade high-performance products like IOTA 9001 are leading the domestic substitution trend. IOTA 9001, with "SiO₂≥99.8% + 1710℃ melting point + A380-grade surface area + GB/T 20020-2005 compliance" hard metrics,
fills the key supply chain link for domestic A380-grade fumed silica in polymer industrial reinforcement/rheology control, providing a mass-producible import-substitution solution for downstream rubber, plastic, coating, and adhesive enterprises. This confirms domestic nano-SiO₂ functional fillers are leaping along "precipitated (coarse/low-purity) → fumed A380 (nano-scale high-purity multi-functional)" — a quality leap with continuously growing technical say in polymer industrial critical additives.
