Stability / Shelf Life
Our Services
Accelerated Stability & Compatibility Testing
Pentyl Labs performs accelerated stability testing to evaluate how cosmetic and personal care products perform under controlled elevated temperature conditions. By storing products at 40°C and assessing them at defined timepoints, we identify separation, discoloration, packaging interaction, and physical instability before market release.
Because early formulation changes can occur gradually, structured stability programs provide critical development insight and stronger launch confidence. In addition, compatibility evaluation helps manufacturers detect container interaction risks before distribution.
Select a stability program below to begin structured product evaluation.
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Name | Description | Price | Turnaround Time | Sample Size | Quantity | Add to cart |
|---|---|---|---|---|---|---|
1 Month Accelerated Stability and Compatibility: Samples are stored at… | $150 | 4 weeks | 4 containers | |||
3 Month Accelerated Stability and Compatibility: Samples are stored at… | $275 | 12.5 weeks | 4 containers | |||
6 Month Accelerated Stability and Compatibility: Samples are stored at… | $475 | 27 weeks | 5 containers | |||
Complete ISO 11930 preservative efficacy testing with suitability and Criteria… | $500 | 6 weeks | 250mL | |||
Shelf Life and PAO Assessment evaluates how long a cosmetic… | $60 | 7 days | Stability report; PET report (if available); Ingredient list | |||
USP Microbial Testing per USP <61>, including Aerobic Plate Count… | $40 | 2 weeks | 50 grams |
Accelerated Stability & Compatibility Testing
Semi-Custom Programs for Cosmetics & Consumer Products
Pentyl Labs performs accelerated stability testing to evaluate product performance, visual integrity, and packaging compatibility under controlled storage conditions. Our programs help manufacturers estimate shelf life, assess PAO (Period After Opening), and identify early formulation instability before products reach the market.
Because formulation changes can occur gradually, structured timepoint evaluation provides valuable development insight. In addition, controlled storage conditions allow us to detect separation, discoloration, and packaging interaction risks early in the product lifecycle.
What Our Stability Programs Include
Each accelerated stability program includes:
Controlled storage at 40°C
Defined timepoint evaluations
Visual inspection and documentation
Phase separation monitoring
Appearance and odor assessment
Compatibility review with primary packaging
Summary stability report
While our standard programs follow structured timeframes (1-, 3-, or 6-month), we also allow semi-custom adjustments depending on formulation type and client objectives.
Quantitative Color Stability Monitoring (ΔE Trending)
In addition to traditional visual inspection, Pentyl Labs offers optional ΔE color trending using controlled digital imaging.
Under standardized lighting and fixed imaging geometry, we evaluate relative CIELAB color shifts over time. As a result, we can document subtle discoloration, oxidation, or degradation that may not be obvious during routine visual checks.
This quantitative approach supports:
Oxidation monitoring
Fragrance discoloration tracking
Natural extract stability evaluation
Packaging interaction analysis
Where many laboratories rely solely on observation, we provide measurable trend data.
Learn more about ΔE in stability testing.
Standard Storage Conditions
Our typical accelerated protocols include:
40°C accelerated storage
Freeze–thaw cycling (optional)
Ambient storage upon request
Custom conditions available
Because different formulations respond differently to stress conditions, we can adjust parameters within the scope of a semi-custom program.
Semi-Custom Stability Options
In addition to core visual evaluation, clients may request:
pH testing
Weight loss monitoring
Extended timepoints
Additional packaging formats
Targeted observation of specific failure modes
This flexibility allows brands to tailor the program while maintaining a structured testing framework.
When Stability Testing Is Recommended
Stability testing is recommended when:
Launching new cosmetic or personal care products
Reformulating existing products
Changing packaging components
Preparing retailer documentation
Supporting shelf life and PAO labeling
Furthermore, stability data strengthens internal quality systems and risk mitigation strategies.
Frequently Asked Questions
What temperature is used for accelerated stability?
We typically store samples at 40°C for accelerated studies. However, we can adjust conditions depending on product type.
How long does accelerated testing simulate real time?
While 40°C does not directly equal a fixed shelf life, it provides predictive insight into long-term performance trends.
Is freeze-thaw testing included?
Freeze-thaw cycles are available as an optional add-on.
How many samples are required?
Most programs require multiple identical packaged units to support evaluation across timepoints.
Is stability required under MoCRA?
MoCRA does not prescribe a specific stability protocol; however, manufacturers must substantiate product safety. Stability data supports that obligation.
Begin a Stability Program
Pentyl Labs supports cosmetic and consumer product manufacturers with structured, semi-custom stability programs designed for development insight and compliance support.
For scheduling and pricing inquiries:
📧 [email protected]
