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ASTM G21 Fungal Defacement Test

"Standard Practice for Determining Resistance of Synthetic Polymeric Materials to Fungi"

Welcome to Antimicrobial Test Laboratories' ASTM G21 Test Method Resource Page.

Below, you will find a summary of the ASTM G21 method, along with some of its strengths and weaknesses. The ASTM G 21 method is designed to test the resistance of synthetic polymeric materials (molded materials, surface treated articles or similar objects) to fungi.

Note: The information below is presented for educational purposes only. The current, detailed ASTM G 21 test method can be purchased from ASTM at (

Summary of the ASTM G 21 Test:

Strengths of ASTM G 21:

Weaknesses of ASTM G 21:

ASTM G 21 is an excellent choice for product developers interested in evaluating fungal resistance, and we take great care at Antimicrobial Test Laboratories to make sure that the testing is done well. For more information about ASTM G-21 Testing, Contact the Lab Today!