Answering Your Questions about Zinc Oxide 200nm EasyDisperse™

Here are the answers to your questions:

1. Regarding 1% of Zinc Oxide 200nm EasyDisperse™ in grams:
   1% refers to the proportion of the ingredient in the total weight of your formulation. To know the exact weight in grams for 1%, you need to know the total weight of the batch you are making. For example, if you are making a 100-gram batch, 1% would be 1 gram. If you are making a 500-gram batch, 1% would be 5 grams. You can find more information on calculating percentages in formulations in the guide provided previously.

2. Regarding using Zinc Oxide 200nm EasyDisperse™ as a standard for testing other sunscreen products:
   Generally, a single ingredient like Zinc Oxide 200nm EasyDisperse™ is not used as a standard to test and compare the efficacy (like SPF or PA) of finished sunscreen products. Sunscreen efficacy is determined by testing the complete, final formulation, as the interaction and dispersion of all ingredients significantly impact the protection level. Different formulations using the same percentage of Zinc Oxide can yield different SPF/PA values.

3. Regarding the mixing ratio with Cyclomethicone:
   The product description for Zinc Oxide 200nm EasyDisperse™ recommends mixing it with Cyclomethicone (Cyclopentasiloxane) in a 1:1 ratio for dispersion in sunscreen formulations. This helps ensure the Zinc Oxide particles are evenly distributed, which is crucial for effective UV protection and formula stability. However, as mentioned in point 2, this mixture itself is not typically used as a standard to compare the SPF/PA of other finished sunscreen products; it's a step in preparing the ingredient for incorporation into a full formula.

We hope this clarifies your questions!