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As the coatings, silicone rubber, adhesives, and composite materials industries continue to demand improved product stability, rheological properties, and processing performance, selecting the right functional filler has become an important part of formulation development and manufacturing.
IOTA HL7300 is a hydrophilic fumed silica with silicon dioxide as its main component. Its CAS number is 7631-86-9, and its specific surface area, measured by the BET method, is 300±25 m²/g.
With its high specific surface area and surface characteristics suitable for a range of formulations, IOTA HL7300 can be used in applications involving elastomer reinforcement, rheology modification, thixotropy control, thickening, and anti-settling performance. Typical application areas include paints and coatings, silicone rubber, other elastomers, films, unsaturated polyester resins, adhesives, and sealants.
For manufacturers seeking to balance formulation stability, processing performance, and final product appearance, IOTA HL7300 is a candidate material for formulation screening and performance optimization.
IOTA HL7300 is evaluated using key parameters such as specific surface area, pH, loss on drying, and silicon dioxide content. These specifications provide a reference for formulation development and supplier qualification.
| Technical Parameter | Specification |
|---|---|
| Product Name | IOTA HL7300 |
| Chemical Name | Silicon Dioxide (Silica) |
| CAS Number | 7631-86-9 |
| Product Type | Hydrophilic Fumed Silica |
| BET Specific Surface Area | 300±25 m²/g |
| pH of 4% Suspension | 3.7–4.5 |
| Loss on Drying | ≤2.0% |
| Loss on Ignition | ≤2.5% |
| Residue on 45 μm Sieve | ≤250 mg/kg |
| SiO₂ Content (Based on Ignited Material) | ≥99.8% |
| Tapped Density | 40–60 g/L |
Note: The specifications above are based on the available product data. Please refer to the latest Technical Data Sheet (TDS) and batch-specific Certificate of Analysis (COA) for purchasing and application decisions.
In liquid coatings, adhesives, and sealants, appropriate rheology control helps balance application properties with storage stability.
With its high specific surface area, IOTA HL7300 can promote the formation of a particle interaction network under suitable formulation and dispersion conditions, helping adjust viscosity and thixotropic behavior.
Potential formulation benefits include:
Adjusting rheological properties and thixotropy.
Helping control sagging on vertical surfaces.
Improving the suspension stability of fillers and pigments.
Supporting the optimization of application properties in adhesives and sealants.
Actual performance depends on the resin type, base material polarity, dosage, dispersion equipment, and processing conditions.
Fumed silica is a commonly used functional filler in silicone rubber formulations. Its high specific surface area can facilitate interactions between the filler and polymer matrix, potentially improving reinforcement and processing characteristics in suitable systems.
IOTA HL7300 can be evaluated for silicone rubber and other elastomer formulations. The actual reinforcement effect should be assessed according to the rubber type, filler dispersion, loading level, and curing process.
Pigment and filler settling during storage, as well as sagging during application, can affect coating stability and film quality.
IOTA HL7300 can be incorporated into coating formulations as a rheology control additive to help establish an appropriate internal structure and improve anti-settling and anti-sagging performance.
Comparative tests using different addition levels and dispersion conditions are recommended to evaluate viscosity, leveling, storage stability, and coating appearance.
In unsaturated polyester resins and related composite systems, filler dispersion can influence material transparency, appearance, and processing performance.
According to the available product information, IOTA HL7300 offers good transparency in unsaturated polyester resin systems. For transparent or translucent products, formulation developers should evaluate dispersion uniformity, haze, light transmission, and loading level.
Depending on formulation requirements, IOTA HL7300 can be considered for the following applications.
Paints and Industrial Coatings: Rheology modification, thixotropy control, anti-settling, and anti-sagging formulation development.
Silicone Rubber and Elastomers: Functional reinforcement filler for optimizing mechanical properties and processing performance.
Adhesives and Sealants: Viscosity adjustment, thixotropy improvement, sag control, and storage stability optimization.
Films and Unsaturated Polyester Resins: Formulation development for composite materials and resin systems, with attention to transparency, dispersion, and processing behavior.
Powder Coatings: Under suitable formulation conditions, it can be evaluated for improving powder flowability and helping reduce caking. Application testing is required to confirm the res
