Adding Disodium EDTA and Preservatives to Cosmetic Formulas
คำถาม
1. I usually use distilled water. If I add Disodium EDTA, is it necessary? And is the percentage (0.2%) calculated based on the total formula or just the water?
2. Can preservatives be added to the water phase from the beginning in all formulas to avoid mixing difficulties? If I add 1%, is it 1% of the total formula or just the water?
คำตอบ
Regarding your questions:
Disodium EDTA: The percentage (0.1-0.2%) for Disodium EDTA is typically calculated based on the total weight of the formula, not just the water. It's acceptable to add it if you want extra assurance regarding water purity or packaging, although it might slightly soften the texture of the final product.
Adding Preservatives Early: Adding preservatives like Phenoxyethanol to the water phase at the beginning depends on the formula's heating process. If your formula requires heating to 80°C or higher for an extended period (15 minutes or more), it's generally recommended to add the preservative at the end to prevent degradation. However, if your process uses low heat or no heat, adding the preservative early is usually fine. The percentage for preservatives (e.g., 1%) is also typically calculated based on the total weight of the formula.
ผลิตภัณฑ์ที่เกี่ยวข้องที่กล่าวถึง
Phenoxyethanol (Extra Pure)
