Using Nano Silver in Shampoo and Cream

Based on the available information, here is guidance on using nano silver in shampoo and cream formulations for bacterial elimination:

Usage in Shampoo

For wash-off products like shampoo, Nano Silver 20nm Powder is generally recommended. To effectively eliminate bacteria, a usage rate of 0.01-0.1% of the Nano Silver 20nm Powder is suggested.

While liquid forms of silver are also available, they are typically recommended for leave-on products.

Please note that the silver solutions available are 2000ppm, not 500ppm as mentioned in your query. The recommended usage rates are based on the 2000ppm concentration.

Powder vs. Liquid for Cream

For leave-on products such as creams, liquid forms of silver (Ionic or Colloidal solutions) are generally preferred. They are often more cost-effective for this application and are colorless or light-colored, which helps maintain the appearance of the cream.

The recommended usage rate for the 2000ppm liquid silver solutions (like Silver (2000ppm, Ionic, Colorless Solution, pH 4-6) or Nano Silver (2000ppm, Colloidal, Yellow Solution)) in cosmetic formulas for germ control is typically 1-5%, with 2% (equivalent to 40ppm in the final formula) being a common recommendation for most control/disinfection purposes.

Nano Silver 20nm Powder can be used in all formulations and has high stability, but requires special tools for proper dispersion in general formulas to ensure effectiveness.

Both powder (Nano Silver 20nm Powder) and liquid forms (various solutions like Silver (2000ppm, Ionic, Colorless Solution, pH 4-6) and Nano Silver (2000ppm, Colloidal, Yellow Solution)) are available.

When formulating, also consider the pH compatibility and potential interactions with other ingredients, such as cationic surfactants or salts, as these can affect the stability and efficacy of the silver.