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Microbial Ranking

Microbial Ranking

The Microbial Ranking test evaluates porous materials intended for use in packaging sterile medical devices. This test employs a low flow rate, extended exposure time and increased challenge level, which allows testing of materials with high differential pressure values. This test method is not intended to predict the performance of a given material in a specific sterile packaging application.

This procedure is designed to comply with ASTM F1608 test method. Nelson Laboratories is an active member of the ASTM committees.

Applicable Standards

  • ASTM F1608

Test Options

Standard turn around times (TAT) are listed below. Ask an expert for a specific consultation on your product. If you are ready to submit your samples for testing, click here to fill out the Sample Submission Form.

Code Test TAT (days) Request Quote
PKG350 Packaging: Microbial ranking, ASTM F1608 10 Add
PKG350 - Packaging: Microbial ranking, ASTM F1608
TAT: 10 days

Sample Specifications

PKG350: 4 replicates of one material type per chamber run; each replicate must be 47 mm

Study Outline

The Microbial Ranking test procedure consists of subjecting samples to an aerosol of Bacillus atrophaeus spores at a concentration of about 1 x 106 for 15 minutes within an exposure chamber. Spores passing through the porous material are collected on membrane filters and enumerated.

Please see our Packaging Validation matrix for more information.
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