Using and Diluting Glycolic Acid 70% in Formulations
Asked by: kwanpirom_panyaboot
On: February 13, 2014
Product Type:
Cosmetics
Question
I am interested in using Glycolic Acid in my cosmetic formulations. I understand that the company sells it at 70% concentration (Product ID 241), not 100%.
Could you please explain:
1. How to calculate the correct amount of Glycolic Acid 70% to use in a formula to achieve a specific final concentration (e.g., 20% in a 100g formula)?
2. If I obtain 100% Glycol Acid powder from another source, how can I dilute it to a 70% solution before using it in my formula? (e.g., what ratio of 100% powder to water is needed to make a 70% solution?)
Answer
Based on the conversation:
- Product Availability: The company sells Glycolic Acid at 70% concentration (Product ID 241), not 100%.
- Using 70% Glycolic Acid in Formulations: To achieve a desired final concentration in your formula using the 70% raw material, you need to adjust the amount. As explained in the example, if you want a 20% final concentration in a 100g formula, you would use 20 * (100/70) = 20 * 1.43 = 28.6g of the 70% Glycolic Acid. The amount of water (or other base) would be reduced accordingly (100g - 28.6g = 71.4g).
- Diluting 100% Powder: If you obtain 100% Glycolic Acid powder elsewhere, you can dilute it with water to create a 70% solution (e.g., 70g of powder + 30g of water). Once you have a 70% solution, you can use the dilution ratios provided on the company's website for the 70% product.
- Form: The 70% Glycolic Acid sold by the company is a liquid, which is generally easier to incorporate into formulations compared to the 100% powder form.