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A toothpaste can look perfect in the lab and still disappoint in use: too abrasive, too thin, or separating in the tube.
In most formulations, the deciding factor is not the flavor or the humectant — it is the silica.
IOTA FINE SIL 7520A is a toothpaste-grade precipitated silica supplied in friction, mixed and thickening types.
Silica does two jobs in toothpaste at the same time:
One grade cannot optimize both. That is why the product is supplied in three types, and why the formulation goal should be defined before selection.
IOTA FINE SIL 7520A is an amorphous precipitated silica powder: tasteless, insoluble in water and acid, chemically inert, with good compatibility in fluoride toothpaste and with other raw materials.
Structure and particle size are controlled through production conditions. The product complies with the light industry standard QB/T2346-97.
Its published specifications include:
|
Item |
Friction type |
Mixed type |
Thickening type |
|
SiO2 (dried) |
≥ 95% |
≥ 98% |
≥ 98% |
|
Whiteness |
≥ 93% |
≥ 98% |
≥ 98% |
|
pH (5% dispersion) |
6.5–8.5 |
6.5–8.5 |
6.5–8.5 |
|
Oil absorption (ml/20 g) |
17–20 |
30–42 |
45–60 |
|
Loss on drying (105°C) |
≤ 10% |
≤ 10% |
≤ 10% |
|
Heavy metals (Pb) |
≤ 20 mg/kg |
≤ 20 mg/kg |
≤ 20 mg/kg |
These are typical values; the final formulation must be verified by testing.
Friction type (oil absorption 17–20 ml/20 g). For cleaning- and whitening-oriented pastes where higher abrasion is acceptable.
Mixed type (30–42 ml/20 g). A balance of cleaning and structure — the common choice for daily-use pastes.
Thickening type (45–60 ml/20 g). For viscosity build and paste stability, where cleaning is secondary.
A practical sequence:
1. Is FINE SIL 7520A compatible with fluoride?
Yes — good solubility behavior with fluoride toothpaste is a stated product feature. Compatibility in your formulation should still be confirmed.
2. Can one grade cover both cleaning and thickening?
The mixed type is designed as a balance. For strongly cleaning or strongly thickening formulations, the dedicated types perform better.
3. Is the product compliant with standards?
The series complies with QB/T2346-97.
4. What should buyers provide when requesting a sample?
Paste type, current silica grade, target loading and cleaning/viscosity goals.
Product page: Precipitated Silica IOTA FINE SIL 7520A
Final suitability should be confirmed through controlled testing in the intended formulation.
