Cosmetic Stability & Preservative Efficacy Testing

Show that your formula stays stable in its pack and stays free from microbial growth during use, before you set its shelf life and period-after-opening.

4.9/5Rated by 28 clients

How Cosmetic Stability & Preservative Efficacy Testing works

1Assessment of requirement
2Sample collection
3Right lab assigned
4Testing
5Test report

Each step explained

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Overview of Cosmetic Stability & Preservative Efficacy Testing

Tested by: NABL-accredited partner lab
Regulation: ISO 11930 & ISO 17516
Typical turnaround: 4–12 weeks
Sample needed: 10–20 units in final pack

Stability testing stores the product in its final packaging at room temperature, high temperature, cold and freeze–thaw cycles, and checks appearance, odour, pH, viscosity and active content at intervals. It shows whether the formula separates, discolours or reacts with the pack, and supports the expiry date the Cosmetics Rules require on the label.

The preservative efficacy test (challenge test) under ISO 11930 deliberately adds bacteria, yeast and mould to the product and measures how quickly the preservative system kills them. It is essential for water-based products and for “preservative-free” or natural claims. Finished batches are tested for microbial limits under ISO 17516.

What we do for you

Lab and parameter list chosen for your purpose: licence, export, buyer or internal QC
Sampling guidance, and pickup or on-site sampling where needed
One contact who follows up with the lab until the report is issued
Report explained in plain language, with next steps if a result fails

What to send

The lab confirms the exact quantity and packing for your product when we book the test.

Sample

Quantity: 10–20 units in final pack
Sealed and labelled with the product name, batch number and date
Packed so that it cannot leak or be contaminated in transit

Details to share

Product name and ingredient list (INCI)
Label and the claims you plan to make
Markets where the product will be sold
Cosmetic licence or import registration number, if any

How we handle Cosmetic Stability & Preservative Efficacy Testing

1
Assessment of requirement
We confirm the standard, the list of tests and how many samples your product needs.
2
Sample collection
We collect the samples from your factory or warehouse, or tell you exactly where to send them.
3
Right lab assigned
We choose an accredited lab (NABL, BIS-recognised or ILAC) that covers your standard and can start soonest.
4
Testing
The lab tests your samples against the standard. We follow up and tell you at once if a test fails.
5
Test report
You receive the signed test report, ready to use for BIS, WPC, CE or your buyer.

What the lab tests

Parameter	Why it is checked
Accelerated and real-time stability	Appearance, odour, pH, viscosity, separation
Packaging compatibility	Weight loss, leaching and interaction with the pack
Preservative efficacy (ISO 11930)	Challenge test with bacteria, yeast and mould
Microbial limits (ISO 17516)	Total count and absence of specified pathogens
Active ingredient content	Stability of claimed actives over time

The final list depends on your product, its standard and the purpose of testing. We confirm it with you before the sample goes to the lab.

Frequently asked questions

Do all cosmetics need a challenge test?

Products with water that are opened and used repeatedly need one. Anhydrous products, single-use products and products with high alcohol or extreme pH may be low risk under ISO 29621, which the lab can assess.

Can the report support CDSCO files and label claims?

Yes. Reports from NABL-accredited labs are used in cosmetic licence and import registration files, and as evidence for the claims on your label. We confirm what your application or retailer asks for before testing.

Who carries out the testing?

Instacertify’s partner laboratories, accredited by NABL to ISO/IEC 17025 for the parameters on your report. We choose the lab, arrange the sample, follow up until the report is issued and explain the results to you.

What our clients say

“Instacertify helped us get BIS CRS certification for our entire product range within just 6 weeks. Their team handled everything from documentation to lab coordination. Highly professional service.”

Akash GuptaBIS CRS · Electronics brand

“They handled complete certification for us, from ISO 9001 to BIS for PVC cables and plugs. Thorough, professional and always available — they knew what needed to be done and when.”

Shivank VishnoiISO 9001 & BIS · Cables

“Getting TEC approvals for our access-control products seemed confusing and complex, but Instacertify made it simple.”

Jiten ShahTEC approval · Access control

Not sure which certification you need?

Send us the product name and the countries you sell in. A specialist replies with the standards that apply, the documents to prepare, the lab cost and the timeline. The assessment is free.

The list of approvals comes to you in writing
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