| 摘要 |
An abrasive precipitated silica is provided that provides excellent abrasive performance and good viscosity build, but also has a relatively high degree of transmittance, and an index of refraction that is sufficiently low to allow it to be a component of a transparent toothpaste composition having a relatively high concentration of water. The amorphous precipitated silica composition has a refractive index of from about 1.439 to 1.450, a light transmittance of greater than about 60%, and a Brass Einlehner abrasion value of less than about 5 mg loss/100,000 rev.
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