Certified Reference Material for ASTM E1428 – Antimicrobial Pink Stain Test

Certify your test results today! 

This product includes the world’s first Certified Reference Material (CRM) designed for use as a Test Control in performance of the standard ASTM E1428 test method. Each unit consists of a sample set of both Treated (orange) and Untreated (beige) Test Controls, which are intended to guarantee the highest quality of antimicrobial method performance available and to verify proper ISO 17025 test performance.

CRMs are innovative reference standards developed from decades of antimicrobial testing expertise in the global market and are accredited to the ISO 17034 standard. This accreditation requires the establishment of Certified Values through ISO 17025 accredited method performance.

ASTM E1428 is a standard, globally recognized, antimicrobial product test intended to evaluate the performance of antimicrobials in or on polymeric solids against staining by a Streptomyces species, which is a pink stain organism. Standard ASTM E1428 testing is perfomed for 14 days. The results are interpreted by evaluating the degree of stain on the test sample.

For more information on the ASTM E1428 standard, click here.

For answers to our most frequently asked questions, click here.

Product Performance

Representative images of ASTM E1428 Certified Reference Materials before and after test.

Treated Control (Orange) & Untreated Control (White).


Certified Values of Available Products

Certified Values for this product are derived through a visual assessment of the pink stain on the test sample – Utilizing the scale defined in ASTM 1428.


Scores may range from 0 to 4 on this scale, dependent on the level of pink stain visible under microscope or to the naked eye.


Treated Test Controls

  • Score of 0
    • No observed pink stain; confirmed microscopically

Untreated Test Controls

  • Score of 4
    • Pink stain visible to the naked eye; 50% to complete stain coverage

Learn about all our Certified Reference Materials here.