Using Dimethicone (Medium/350, Low-Odor) in a Heated Formulation

Based on your formula ingredients (water, stearic acid, Vitamin B3, IPM, Cetyl Alcohol, Dimethicone, PEG-10 Dimethicone, preservative), this is likely an emulsion formula which requires heating the oil and water phases to combine ingredients like Stearic Acid and Cetyl Alcohol.

• Dimethicone (Medium/350, Low-Odor): This type of Dimethicone is a non-volatile silicone oil. While the product description doesn't specify a maximum processing temperature, silicones like this are generally stable and can be included in the oil phase and heated along with ingredients like Stearic Acid, IPM, and Cetyl Alcohol at typical emulsion temperatures, usually around 70-80°C.
• Stearic Acid and Cetyl Alcohol: These ingredients require heating to melt (around 60-70°C) before they can be properly incorporated into the oil phase of an emulsion.
• Vitamin B3 (Safe-B3™): The description states that Vitamin B3 has heat resistance and can be mixed in the water phase, but prolonged heating should be avoided.
• PEG-10 Dimethicone: Water-soluble silicones like PEG/PPG-20/15 Dimethicone (which is similar) typically have heat resistance up to around 80°C. This would be added to the water phase.
• Preservative: Preservatives are generally added during the cool-down phase of the emulsion, after the main heating step.

Therefore, you can include the Dimethicone (Medium/350, Low-Odor) in the oil phase of your formulation and heat it along with your other oil-soluble ingredients (Stearic Acid, IPM, Cetyl Alcohol) up to the required temperature for emulsification (typically 70-80°C). Ensure heating is not prolonged unnecessarily, especially considering the Vitamin B3.

Always follow good manufacturing practices and test your formulation for stability.