The Paticle Size Distribution and Friction Coefficent Standards for Toothpaste Abrasives             

The particle size distribution and friction coefficient standards for toothpaste abrasives are as follows:

Particle size distribution:
The particle size of toothpaste abrasives is usually between 5-40μm, and being too fine (less than 5 μm) or too coarse (greater than 40 μm) can affect the user experience.
The width coefficient of particle size distribution decreases as the particle size decreases, and a suitable particle size range helps to improve the friction effect.
The width coefficient of particle size distribution of calcium carbonate abrasive has a significant impact on the friction value of toothpaste. The narrower the particle size distribution, the better the friction effect.
The average particle size of friction agent particles is generally 3-12 μm, and particles that are too fine (less than 1 μm) may lead to the phenomenon of "back coarsening".

Friction coefficient standard:
The method for detecting the friction value of toothpaste includes the GB/T 35832-2018 standard, which specifies the method for measuring the friction value of toothpaste and is applicable to the determination of friction values of various friction systems of toothpaste and the comparison of friction properties of similar toothpaste
.
The friction value (Ra value) has an inverse linear relationship with the particle size of calcium carbonate abrasive, with smaller particle sizes resulting in higher friction values
.
The international standard measurement method for toothpaste friction agents is RDA value (Relative Deterioration in Abrasion). The RDA value range of 0-70 for ordinary toothpaste is considered low abrasion, 70-100 is moderate abrasion, 100-150 is high abrasion, and 150-250 is harmful.

Other influencing factors:
The hardness, shape, and uniform distribution of abrasive particles can also affect the friction performance of toothpaste.
The chemical stability, solubility, and compatibility with other components of toothpaste of abrasive particles are also important considerations.

In summary, the particle size distribution of toothpaste abrasives should be controlled between 5-40 μm, and the narrower the width coefficient of the particle size distribution, the better to improve the friction effect; The friction coefficient standard needs to be evaluated based on RDA or Ra values to ensure that toothpaste does not damage enamel while cleaning teeth.

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