Silica (SiO₂) is a key reinforcing filler for silicone rubber, coatings, and adhesives. Long-term reinforcement performance mainly depends on surface area, surface treatment, and dispersion quality. IOTA offers a wide range of precipitated and fumed silica products for different application requirements.

IOTA Silica Product Categories

Precipitated Silica (Hydrophilic)
Cost-effective with good reinforcement performance, widely used in tires, coatings, food applications, and general silicone products.

Precipitated Silica (Hydrophobic)
Surface-treated for improved dispersion and water resistance, suitable for defoamers, greases, and liquid silicone rubber.

Fumed Silica (Hydrophilic)
High purity and high surface area, designed for premium silicone rubber and specialty coatings.

Fumed Silica (Hydrophobic)
Treated with HMDS, PMDS, or DDS, providing excellent dispersion and long-lasting reinforcement for high-performance silicone rubber and sealants.

Main Precipitated Silica Grades

IOTA FINE SIL 7325
For tires and rubber footwear, high reinforcement.

IOTA FINE SIL 7360 / 7518
Specially designed for silicone rubber, high reinforcement.

IOTA FINE SIL 7515
For adhesives, medium-to-high reinforcement.

IOTA FINE SIL 7300 / 7516
For coating matting applications, medium reinforcement.

IOTA FINE SIL 7520 Series
For food and toothpaste applications, low reinforcement.

Hydrophobic Precipitated Silica Grades

IOTA GW 7100 / 7150 / 7800
Suitable for defoamers and liquid silicone rubber, offering durable reinforcement.

IOTA PG 7800 / GF 7600 / SW 7350D
Used in greases, textile auxiliaries, and defoamers with medium-to-high reinforcement performance.

Main Fumed Silica Grades

IOTA HL 7150 / 7200 / 7300 / 7380
High purity and high surface area for superior reinforcement in premium silicone rubber applications.

Hydrophobic Fumed Silica Grades

IOTA HB 7132 / 7135
HMDS-treated, excellent dispersion, and outstanding long-term reinforcement.

IOTA HB 7139
PMDS-treated, superior dispersion and reinforcement durability.

IOTA HB 7151 / 7152
DDS-treated, excellent heat resistance and long-term stability.

How to Choose Silica for Long-Lasting Reinforcement?

Consider Surface Area

Higher surface area generally provides stronger reinforcement. Fumed silica typically offers higher reinforcement than precipitated silica.

Consider Surface Treatment

Hydrophobic treatments such as HMDS, PMDS, and DDS reduce agglomeration, improve dispersion, and enhance long-term reinforcement performance.

Consider Dispersion Quality

Better dispersion creates a more stable reinforcing network. For liquid silicone rubber and premium sealing applications, hydrophobic fumed silica is usually the preferred choice.

Market Trends

Driven by the growth of EVs, high-performance tires, and advanced sealing systems, demand for fumed and hydrophobic silica continues to increase.

Industry forecasts indicate annual growth rates of approximately 20–25% for hydrophobic silica and EV-related silica applications.

Summary

Choose precipitated silica for cost-effective reinforcement.

Choose fumed silica for maximum reinforcement performance.

Choose hydrophobic silica for long-term durability and weather resistance.

Choose the HB Series for premium reinforcement and superior dispersion.

For applications requiring long-lasting reinforcement, high-surface-area hydrophobic fumed silica is typically the best solution.