Stability & Compatibility Test
Our lab tests how your product changes over time and how it behaves inside the packaging you plan to use, so you find problems at the bench, not on the shelf.
Formulation & Development
200+ founders have built with us.
As featured in
Where our clients sell
Sounds familiar?
01
You're about to place a production order and nobody has tested the final pack.
02
Your product separated or changed colour after a few weeks.
03
Your manufacturer or retailer is asking for stability data you don't have.
04
You changed packaging and don't know if the formula still works in it.
Our cosmetic stability testing services cover two questions: how your formula changes over time, and how it behaves in its pack. The second is cosmetic packaging compatibility testing, and it’s the one brands skip.
A formula can look perfect in a beaker and behave very differently three months later in a pump bottle on a warm bathroom shelf. Separation, colour shifts, scent changes, a pump that clogs or a tube that collapses: these show up in stability and compatibility testing or they show up in customer reviews.
We run the tests in our own lab, on your formula, in your actual pack.
A good fit if
✓ Brands with a finished formula heading into production
✓ Founders switching to new packaging
✓ Teams who need data for a retailer or manufacturer
Not the right fit if
✕ Formulas still in early development
✕ Brands that haven't chosen packaging yet (start with Packaging Development & Support)
✕ Anyone looking for microbial testing only (see Microbial & Preservative Test)
What you walk away with
01
Test plan
Which conditions and time points your product goes through, agreed up front.
02
Stability results
How appearance, colour, odour, pH and viscosity change over the test period.
03
Compatibility results
How the formula and pack interact: leaks, weight loss, discolouration, component issues.
04
Report and recommendation
A clear read on whether the product is ready, and what to change if not.
How it works
Plan
We agree on the test conditions, time points and packaging.
Set up
Samples go into the lab in your final pack.
Monitor
We check and record results at each time point.
Report
You get the results and our recommendation.
Timeline
4 months
Revisions
1 round
Meetings
2 meetings
Ready to start?
Pick a time that suits you and we'll confirm by email.
Start with a free discovery call
Every Stability & Compatibility Test project starts with a short free call, so we can understand what you need and scope it properly.
Book a free discovery call
Questions, answered.
What is cosmetic stability testing?
Stability testing stores a product under controlled conditions, often including heat, cold and freeze-thaw cycles, and checks how its appearance, smell, texture and pH change over time. It tells you whether the product will stay the way you made it for its intended shelf life.
What is packaging compatibility testing?
It checks whether the formula and its packaging get along: no leaking, warping, discolouration, weight loss or ingredients reacting with the pack material.
Why does packaging matter in stability testing?
A formula can be stable in glass and unstable in plastic. Some ingredients interact with packaging materials, pumps can clog, and air or light getting in changes the product over time. Testing in the final pack is the only way to know.
What is accelerated stability testing?
It stores samples at higher temperatures to speed up changes that would normally take months, giving an early read on how the product will age. It's an estimate, so it's often paired with longer testing at room temperature.
When should I do stability testing?
Once the formula is final and the packaging is chosen, and before you place a production order. Changing either one later usually means testing again.
How long does testing take?
Our standard test runs 12 weeks under accelerated conditions.
Do I need to send final packaging?
Send us six filled units. Fill them in the packaging you plan to sell in, because the compatibility part of the test checks the formula against that pack.
Test it now. Not after the reviews come in.
Stability & Compatibility Test