Cosmetic Stability Testing
Cosmetic stability testing evaluates how a finished product maintains quality, safety, and performance over time. At Pentyl Labs, cosmetic stability testing helps determine shelf life, Period After Opening (PAO), and overall product durability under both real-world and accelerated conditions. These studies are essential for regulatory compliance, product safety, and brand reliability.
Stability testing assesses whether a formulation continues to meet specifications throughout its intended lifecycle. It also helps identify potential issues before a product reaches the market.
What Cosmetic Stability Testing Evaluates
Cosmetic stability testing monitors key physical and chemical attributes, including:
- Appearance, color, and clarity
- Odor and fragrance stability
- pH changes
- Viscosity and texture
- Phase separation or sedimentation
- Weight loss and packaging interaction
These parameters help confirm that products remain consistent, effective, and safe for consumer use.
Real-Time and Accelerated Stability Studies
Pentyl Labs offers both real-time and accelerated cosmetic stability testing programs.
Real-time studies evaluate products under normal storage conditions over extended periods. Accelerated studies expose products to elevated temperatures, humidity, and light to simulate long-term aging in a shorter timeframe. Together, these approaches support shelf-life justification and PAO determination.
Stability testing is commonly required for creams, lotions, serums, cleansers, shampoos, sunscreens, and other personal-care formulations.
Packaging Compatibility and Stress Testing
Stability testing often includes packaging compatibility studies. These studies assess how a formulation interacts with its container over time. Testing may reveal leaching, deformation, discoloration, or product loss caused by packaging materials.
Packaging stress testing helps ensure that the final product performs as intended throughout distribution, storage, and consumer use.
Regulatory and Quality Support
Cosmetic stability testing supports compliance with global cosmetic regulations, including EU, UK, and U.S. requirements. Stability data is frequently reviewed during product safety assessments, retailer audits, and regulatory submissions.
For additional regulatory context, see FDA guidance on cosmetic shelf life and product quality:
https://www.fda.gov/cosmetics/cosmetic-products/shelf-life-cosmetics
Cosmetic Stability Testing at Pentyl Labs
Pentyl Labs designs stability studies tailored to your formulation, packaging, and market requirements. We provide clear, defensible data to support product launches, reformulations, and ongoing quality programs.
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