Study samples expiration dating
Since you’ll be making hundreds or thousands of prototypes during your career, it won’t be practical to run a stability test on all of them.
You’ll also find that changes happen so rapidly at your company, you won’t have time to properly test many of your formulas.
You’ll also want to take p H and viscosity readings. Some standard temperatures include 50C, 45C, 37C, 25C (RT), and 4C.
You’ll also want to conduct a freeze/thaw stability test which involves cycling your product through 24 hours of freezing then 24 hours of thawing.
The underlying assumption in stability testing is that increasing storage temperature speeds up any aging reactions that will occur.But there are times when you need to do stability testing.Here is a short list of some of the most important times to conduct a stability test. New prototypes — Whenever you make a new formula and are satisfied with the way it performs, you’ll want to do a stability test to ensure that it will stay together.Different lighting conditions involve a fluorescent light box and a natural light box (to simulate sunlight). Samples should be evaluated at the following intervals. Only the RT, 37C and 4C samples will be evaluated after one year.The highest temperature samples and the light exposed samples only need to be evaluated for the first three test intervals.