Detectable polymers

MagniF is capable, due to its high density and ferri-magnetic properties, of making polymers metal detectable with high frequency coil.

When formulating detectable compounds it is important to consider the loading levels, the particle size, optical properties as well as the surface appearance. The polymer detection using different systems is also an area where MagniF is advantageous.

MagniF is a high quality dry powder manufactured from the natural iron oxide Magnetite mined at LKAB group owned mines in Northern Sweden. This guarantees the supply all year-round and a promise of the best quality consistent product every delivery.

Other important factors are of course the processing equipment requirements, however MagniF supports the compounding process as it is very easy to disperse even at high loading levels.

Polymer detection made easy

Cable ties containing 10% MagniF 10 F or MagniF 25 F are easily detectable by commonly used high frequency coil detectors. A spherical particle of the compound of 2mg gives a similar signal response to 0.1 mg Fe-steel with a certain delay. The signal delay is characteristic for MagniF and similar to stainless steel and makes it even more suitable to detect plastic contaminations in wet or frozen food polymer packaging.

When dispersed into a polymeric matrix, MagniF magnetite powders can be detected when a certain concentration of the mineral passes the detector. As well as the addition level of MagniF, the size, shape, orientation and position of the polymeric specimen influences the response signal.

MagniF in detectable cable ties for being used in the food industry.

MagniF as a functional filler in polymers brings several advantages for the detectable compound:

  • High loading levels possible
  • Low wall thickness (important for high frequency coil)
  • Good rheology and mold fill
  • Short cycle times in injection moulding

MagniF 10 / MagniF 10F gives higher loading levels, better mechanical properties and surface finish than MagniF 25 or MagniF 25F. The higher tinting strength of the black MagniF 10 or MagniF 10F gives a higher contrast than the coarser MagniF 25 or MagniF 25F, which is beneficial for x-ray detection but requires adding more TiO2 if a bright colour is required.

Extra benefits of MagniF

MagniF provides other benefits that in many applications are of huge interest: It is food approved for being used in polymer parts in the European (EC) and US American (FDA, up to 80 wt%) markets. This covers full usability within plastics that are used in food applications.

Application expert

Peter Duifhuis
Business Development Manager MagniF

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