Packaging Digest is part of the Informa Markets Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them. Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

Controlling microbial growth in plastic packaging

Article-Controlling microbial growth in plastic packaging

Antimicrobial additives can be used with polypropylene (PP), polyethylene (PE), and other plastics to inhibit biofilm build up in bottles, medical products, and other plastic items, it is reported.

MicroBlok S and MicroBlok Z from Plastics Color Corp. can be used to help eliminate undesired odors, enhance product freshness, prevent product degradation, and fight stains, according to a company statement.

“Depending on the version of MicroBlok, as an antimicrobial, it inhibits the growth, on the treated plastic, of bacteria, molds, fungi, etc.,” Sarah Skidmore, Marketing Manager at Plastics Color, tells PMP News. “MicroBlok protects the plastic by preventing product degradation. As a masterbatch (or compound, if desired), it is dispersed into the resin used to create the part — so it lasts the lifetime of the product.”  

MicroBlok S consists of silver ions that are evenly dispersed throughout an application, while MicroBlok Z contains a zinc compound and is suited for resins with low melting temperatures, the company reports. Common resins for MicroBlok S include TPU, PC, ABS, PP, and PE; TPE, TPU, PE, and PP are suitable for MicroBlok Z.

Stable at any polymer processing temperature, MicroBlok is strictly regulated under the Environmental Protection Agency’s Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) as well as by FDA and the National Sanitation Foundation. The company reports that it has been tested and approved to meet (or exceed) several regulatory statutes, including ISO 22196:2011, which measures the growth of bacteria within a 24-hour period on the tested plastic substrates. 

For more information on MicroBlok S or Z, visit

Image courtesy Plastics Color Corp.

Hide comments


  • Allowed HTML tags: <em> <strong> <blockquote> <br> <p>

Plain text

  • No HTML tags allowed.
  • Web page addresses and e-mail addresses turn into links automatically.
  • Lines and paragraphs break automatically.
Multigenerational Workforce

In today’s workplace, five generations are actively employed. In this free ebook, learn how to leverage the strengths of each generation in your packaging department.