Suitability of Thyme Kill and Mild Preserved Eco as Preservatives for HP/CP Soap
คำถาม
Regarding the use of natural preservatives in HP (Hot Process) and CP (Cold Process) soap making:
Are Thyme Kill (o-Cymen-5-ol) and Mild Preserved Eco (Ethylhexylglycerin, 1,3 Propanediol) suitable for use as preservatives in HP/CP soap formulations? Specifically, considering the typical high pH (9-11) and potential heat exposure in these processes, how do the characteristics of these preservatives, such as the effective pH range (4-9 for Mild Preserved Eco) and heat tolerance (up to 80°C for 5 minutes for Mild Preserved Eco), affect their efficacy?
What are the recommended usage percentages for Thyme Kill (0.05-0.1%) and Mild Preserved Eco (1-1.5% or up to 2%) in such applications, and is Challenge Testing necessary to confirm their effectiveness in the final soap product?
คำตอบ
Natural Preservatives for HP/CP Soap: Thyme Kill and Mild Preserved Eco
You're asking about using natural preservatives like Thyme Kill (o-Cymen-5-ol) and Mild Preserved Eco (Ethylhexylglycerin, 1,3 Propanediol) in HP and CP soap making, and their suitability regarding pH and heat tolerance.
It's important to consider the pH of your product when choosing a preservative, as effectiveness can vary greatly with pH. HP and CP soaps typically have a high pH, usually ranging from 9 to 11.
Based on the information available:
- Mild Preserved Eco: This product is effective in cosmetic formulas with a pH in the range of 4-9. It can withstand heat up to 80°C for no more than 5 minutes.
- Thyme Kill: This acts as a preservative booster and is recommended to be used in combination with other preservatives like Mild Preserved Eco. The recommended usage is 0.05-0.1% for Thyme Kill and 1-1.5% for Mild Preserved Eco for general formulas, or up to 2% for Mild Preserved Eco in formulas difficult to control infection.
Given that HP and CP soaps have a pH typically above 9, Mild Preserved Eco's stated effective pH range (4-9) indicates that its efficacy may be significantly reduced or unstable in the high alkaline environment of soap. While Thyme Kill is a booster, its effectiveness is tied to the primary preservative it's paired with.
The heat tolerance of Mild Preserved Eco (80°C for 5 minutes) might also be a factor depending on the specific temperatures and duration involved in your HP soap process.
Therefore, while Thyme Kill and Mild Preserved Eco are effective in certain cosmetic applications within their specified pH and temperature limits, their suitability for the high pH and potentially high heat conditions of HP/CP soap is questionable based on the provided data for Mild Preserved Eco's pH range. It is highly recommended to perform challenge testing on your specific soap formulation to confirm the effectiveness of any preservative system at your product's final pH and under typical storage conditions before widespread use or sale.
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Mild Preserved Eco™ (Preservative-Free)
