Microbial susceptibility of various polymers and evaluation of thermoplastic elastomers with antimicrobial additives R E S E A R C H A R T I C L E Microbial susceptibility of various polymers and evaluation of thermoplastic elastomers with antimicrobial additives Zachary Zander1 | Deirdre Newton2 | Heather Scaglione1 | Averie Reiber1 | Parminder Agarwal2 1Avient Corporation, Avon Lake, Ohio, USA 2Lonza LLC, Morristown, New Jersey, USA Correspondence Zachary Zander, Avient Corporation, 33587 Walker Road, Avon Lake, OH 44012, USA. Control samples (top row) are shown for comparison to samples post-incubation and washing (bottom row) TABLE 1 Summary of ASTM G21 results for initial susceptibility screening of untreated resins/compounds Fungal growth Resin/compound 4 = Heavy growth (61%– 100% coverage, fail) TPE, 6 formulations 3 = Moderate growth (31%–60% coverage, fail) Poly(urethane), 2 formulations 2 = Light growth (11%– 30% coverage, fail) Nylon-6,10, PBT, poly(amide) elastomer, ABS, 3 formulations, reinforced Nylon, 2 formulations 1 = Trace growth ( Clarity and yellowness remains an industry challenge for thermoplastics with bulk- imbedded antimicrobial additives.

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