How To Test The Stability Of A Cosmetic Formula ?

Cosmetic Formula

How To Test The Stability Of A Cosmetic Formula ?

Cosmetic Formula – During a cosmetic product’s stability test, it is determined whether the cosmetic product resists change or variation of its initial properties over time; this is usually under specified or reasonably foreseeable conditions of storage and use.

You examine your samples for various physical, chemical, and performance attributes at regular periods to observe how they have changed. If the modifications are minor compared to your company’s expectations, your formula is deemed to have “passed” stability testing. This means you can be confident that the cosmetic product will be as good as when it was initially made when it is sent to retailers and, eventually, customers.

The basic premise of stability testing is that a more considerable storage temperature hastens any aging responses. A good rule of thumb is that a sample held at 45 degrees Celsius for eight weeks is similar to one stored at ambient temperature for a year. This isn’t an accurate forecast, but it’s enough for cosmetic items.

Cosmetic Formula

What are the conditions for cosmetic stability testing?

Here is a list of some of the most critical occasions to do a stability test.

1. Introducing New Prototypes

When you create a new formula and are pleased with its performance, you should run a stability test to confirm that it will remain together. Don’t bother testing all of your prototypes; only test the ones that operate correctly.

2. Fresh Raw Materials

When you modify the aroma, color, or other raw material in a recipe, you must do a stability test to ensure no unwanted changes. You should also test when you get an excellent raw material source.

3. An Innovative Manufacturing Process

Manufacturing constantly looks for speedier methods to create formulations. This usually implies changing the order of additions or shortening the mixing time. When such changes occur, they may have an impact on your formula. Perform a stability test to see whether the difference is satisfactory.

4. Packaging Redesign

Cosmetic items alter their appearance virtually yearly; therefore, the packaging is regularly updated. When you receive a new package, you must determine whether the formula is still compatible. Stability testing helps to assure this.

What are the best ways to test cosmetic stability?

The accompanying is a basic format for performing a cosmetic formula stability test.

  • Get your batch ready: Determine how much to create depending on the number of samples required for the test. Creating 30-40% more than you believe you’ll need is wise.
  • Refill in your samples: You should have the proper packing, but don’t rely on it. Fill glass jars with the product and include them with the completed package when suitable. If feasible, do instability testing on both glassware and packaging. The total sample size depends on how much testing you undertake, but you should have at least two samples for each preservation state.
  • Get an initial reading: Once you’ve completed your sample, test it for all of the features you’ll be evaluating later. The specific tests may vary depending on the product, but you should note the look, color, and aroma. You should also measure the pH and viscosity. Spray patterns for aerosol items will be tested.
  • Experiment with different conditions: Variable temperature and light conditions are required for stability testing. Temperatures that are considered normal include 50°C, 45°C, 37°C, 25°C (RT), and 4°C. A freeze/thaw stability test, which entails cycling your product through 24 hours of freezing and afterward 24 hours of thawing, is also encouraged. A fluorescent lightbox and a natural lightbox are used under different lighting circumstances.
  • Test the product: At the appropriate intervals, samples should be inspected. Two weeks, four weeks, eight weeks, twelve weeks, and fifty-two weeks. After one year, only the RT, 37C, and 4C samples will be examined. Only the first three test cycles need the most significant temperature and light-sensitive samples to be analyzed. The assessment tests should be the same as those you used to take your first readings.
  • Analyze the stability: After eight weeks, you may reliably determine whether or not your formula is stable. Almost all goods will alter; thus, it will be up to you (and your manager) to determine if the product succeeded or failed.

In Ireland, cosmetic stability testing is one of the most widely used approaches you will perform early in your career. You’ll prevent burnout and be able to convey when a product is ready to launch if you can develop a procedure that you regularly follow.

Ireland-based, Cosmetics Works is an independent manufacturing and regulatory service company that can manage all stages of your EU cosmetic product development from concept to market in a stress-free manner.

Contact our cosmetic beauty consultants by calling +353 1 535 3507 or by sending an e-mail to for additional information!

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