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Research & Development Stability Trials

Research and Development (R & D) Stability Trials comprise of:


1)  R & D  Preservative Efficacy Test (PET)
2)  R  & D  Accelerated Stability Trial


Once our formulation has been developed and approved,  it is important to make sure it is safe and robust enough to last until the recommended expiry date.  An indication of this can be determined by performing an accelerated stability trial on a laboratory sample of a product that the client is aesthetically pleased with.


What is R & D, Preservative Efficacy Testing (PET)?

Even though each formulation is carefully researched and preserved in accordance with appropriate certified organic cosmetic standards and customer requests, it may still be  important to confirm that the chosen natural or organic preservative system (for each new or unique product/product category) is effective before being subjected to an indicative R & D stability trial.

A PET test is typically performed at the start and end of a stability trial (accelerated or real time) to make sure that the preservative system of that formulation is protecting the product from spoilage (due to microbiological contamination).

Generally, the cosmetic industry commonly uses the microbial challenge test to evaluate the effectiveness of a preservative system in a product. This test involves purposely introducing a selection of microorganisms known to cause spoilage and potential harm to consumers, into a product at known levels and watching how the preservative system reacts over a specified time. The British Pharmacopeia and United States Pharmacopeia (BP and USP) respectively have pre-defined acceptance levels and time frames to assess the outcome of such tests.

Generally speaking : Full PET  requires a 400 g sample and  takes 28 days (allow another 7 days for handling and reporting). The cost will vary depending on the formulation and other requirements.


What is R & D Accelerated Stability Trial?

The process, as the term ‘accelerated’ suggests, involves subjecting a formulation in it’s final pack or packaging material (that has passed an initial PET) to elevated temperatures (40°C, 45°C) and checking physical and chemical attributes at predetermined time intervals. At the end of the predetermined accelerated time interval the stability samples are checked for the physical parameters such as pH, viscosity, color and odour. This information is reviewed and the time is extrapolated to predict an expiry date.


For more information on our best Stability testing please Contact Us