When silica works as a carrier or filler, the product specification that decides your batch record is not reinforcement — it is purity, particle consistency and flow behavior. A commodity filler can pass a visual check and still fail the formulation.

IOTA FINE SIL 7365 is a superfine precipitated silicon dioxide with a stated dual role: reinforcement for silicone rubber, and low-impurity carrier / filler duty for powder systems.

1. What Is FINE SIL 7365?

An ultrafine precipitated silica made by a special processing technology, with excellent reinforcement and dispersion — and a second, often overlooked application profile as carrier and filler.

Published specifications:

2. What Does It Deliver as a Carrier and Filler?

• Low-impurity processing with high surface area — the stated basis for carrier duty.

• Feed additives, pesticides and detergent powders: used as a carrier to improve flowability of the active or powder blend.

• Ceramic glaze coloring: stated good color-fixing effect — no fading under long-term, high-temperature conditions.

• Note the tighter purity figures vs typical commodity grades: sulphate ≤ 1.0%, iron ≤ 300 mg/kg.

3. How Should You Evaluate It?

1. Define the carrier loading and the target free-flow behavior of your powder blend.

1. Check moisture (4–8%) against your system's hygroscopicity limits — carriers live or die by caking.

1. Verify iron and sulphate limits against your formulation's purity requirements.

1. For glaze duty, run a color-fixing trial under your actual firing curve and confirm no fading.

FAQ

1. Is 7365 only a carrier grade?

No — the same grade is stated to reinforce silicone rubber (better than ordinary precipitated silica, no whitening after stretching). One grade, two application profiles.

2. How does it compare with FINE SIL 7360?

Both are superfine precipitated grades with BET 180–200 m²/g and 8 µm particle size; 7365 states lower limits for sulphate (≤1.0% vs ≤1.5%) and iron (≤300 vs ≤500 mg/kg). Choose by your purity requirements.

Conclusion: for carrier and filler duty, purity limits are the spec sheet lines that matter — FINE SIL 7365 puts them in writing.

Related product: Precipitated Silica IOTA FINE SIL7365