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Eriez | Authority in Separation Technologies

PolyMag® Additives

Add metal detectability, X-Ray contrast and magnetic susceptibility into plastic moldings to prevent plastic contaminated food products from reaching consumers.





Eriez PolyMag Metal and X-Ray Detectable Plastic Additives

Eriez PolyMag Additives impart metal detectability, X-Ray contrast, and magnetic susceptibility into plastic moldings to prevent plastic contamination from reaching the consumer.

Molders can satisfy varying levels of detectability at a cost substantially less than specialty compounds. This eliminates the need to buy minimum quantities of special resins and carry excess material inventory.

Major brand owners, retailers and restaurant chains insist that food processors utilize plastic and rubber articles that are Metal and X-Ray Detectable. This has become part of many company's HACCP (Hazard Analysis Critical Control Point) programs.

More recently, the Food Safety Modernization Act (FSMA) requires Agricultural Producers, Food Processors & Packers to implement Hazard Analysis & Risk-Based Preventative Controls (HARPC) to prevent physical contaminates like glass, metal, wood & plastic from entering the market. The FDA considers contaminates greater than .275” (7mm) in length to present a hazard. Growers, packers & food processors are using their existing metal detector and x-ray inspection system with detectable plastics to prevent plastic contaminated foods from reaching consumers.

About PolyMag Additives

Eriez' FDA-compliant PolyMag additives impart Metal Detectability, X-Ray Contrast and Magnetic Separation into a range of polymers. We supply these masterbatch additives to molders of returnable plastic containers, pallets, scoops, scrappers, o-rings, conveyor belting, bucket elevators and more. PolyMag additives are typically included at 10% to 20% loadings in moldings and extrusions.

Resins containing the PolyMag Gray HSCP can be pigmented darker colors like blue, gray, green, red and purple. The lower cost PolyMag Black HSCP is suitable for black applications.

PolyMag Beige XRD is preferred for applications that require a high level of X-Ray contrast.  Molders can include both the PolyMag® HSCP and XRD masterbatch additives to impart Metal Detectability and X-Ray contrast in plastic parts.

The FDA has offered a favorable opinion of the PolyMag additives per CTS 75807. We also provide PolyMag powders for special compounding needs or for use in foam, thermoset rubber and liquid raw materials.

As a leading manufacturer of Metal Detection systems, Eriez can assist you with the level of detectability and X-Ray contrast required by different food processing applications and we can provide an analysis of your product’s inspection signature. 

White Papers

Metal Detectable Plastic Application Considerations

Eriez PolyMag Additives impart Metal Detectability into plastic moldings to prevent plastic contaminated products. These white papers explain actions by the U.S. Food and Drug Administration (FDA) and the basics of how metal detection and X-Ray inspection works.

Document Download: White Paper - Metal Detectable Plastic Application Considerations

X-Ray Detectable Plastic Application Considerations

Typically plastics are not Metal or X-Ray Detectable; however Eriez offers several PolyMag® masterbatch additives to impart X-Ray visibility, Metal Detectability and Magnetic Susceptibility into plastic products.

Document Download: White Paper - X-Ray Detectable Plastic Application Considerations


Data Sheets

Safety Data Sheets



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