Purity and Crystal Structure of Nano Zinc Oxide and Titanium Dioxide Liquids for Sunscreen
คำถาม
Based on the new FDA announcement (dated Feb 18, 2019) regarding sunscreen ingredients, which specifies properties like purity and crystal structure for nano-form raw materials (both Zinc Oxide and Titanium Dioxide), I would like to know:
What is the purity value and crystal structure type for the following products:
- Zinc Oxide 35nm Liquid
- Titanium Dioxide 15nm Liquid (Gloss)
This information is not specified in the MSDS. Thank you.
คำตอบ
Information on Zinc Oxide 35nm Liquid and Titanium Dioxide 15nm Liquid (Gloss)
Regarding your question about the purity and crystal structure of Zinc Oxide 35nm Liquid and Titanium Dioxide 15nm Liquid (Gloss) based on the new Thai FDA announcement, I have reviewed the product descriptions.
The product descriptions provide the following information:
- Zinc Oxide 35nm Liquid: Contains 45-48% active Zinc Oxide (35nm particle size) in a liquid dispersion.
- Titanium Dioxide 15nm Liquid (Gloss): Contains 34-37% active Titanium Dioxide (15nm particle size) in a liquid dispersion.
However, the product descriptions do not specify the purity of the raw Zinc Oxide or Titanium Dioxide powder material before dispersion, nor do they provide details about the specific crystal structure (e.g., Anatase, Rutile). This level of detailed technical specification is often found in a Certificate of Analysis (CoA) or a full technical data sheet, which may not be included in the standard product description or MSDS.
For precise information on the purity and crystal structure as required by the new FDA announcement, it would be best to contact the supplier directly to request the full technical specifications or Certificate of Analysis for these specific batches.
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Titanium Dioxide 15nm Liquid (Gloss)
