Heat Parts A and B to 45-50 C and blend. "Varion" SBFA 30 should not exceed 50 C. If you use initial temperatures greater than 50 C, add the SBFA 30 after the phases have been blended. The SBFA should be added at 50 C or below. Adjust pH to 6.5 with citric acid, cool with agitation to 30 C, blend in preservative.