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Pharma PET testing – Technical Information

Test:  Preservative Efficacy Test (EP method)

MCS test reference:  TMPh1

Quantity of sample required:  100 g

Total test time:  35 days


Test schedules:

The exact test organisms and time points used depend on the product being tested.  We will confirm this with you to ensure the most appropriate test is carried out.

The test involves the inoculation of the product with some or all of the following:

Staphylococcus aureus

Pseudomonas aeruginosa

Aspergillus brasiliensis

Candida albicans

E coli

Zygosaccharomyces rouxii

Along with these organisms we can also include environmental isolates that have been shown to exploit weak preservative systems.  This gives the most comprehensive assessment of your preservative system.

Sending samples:

Send samples to the address at the bottom of this page.  Include a completed Test Request Form.


Written reports are provided upon completion of the test.  Where requested, interim updates can be given by email.

Results are given as a passing / failing to meet the criteria of the European Pharmacopoeia.