When discussing detectable plastics, one of the most frequently asked questions is: is magnetic detectability sufficient, or is it better to choose a material that is also X-ray detectable? The answer depends on the type of line, the inspection system installed, the shape and minimum size of the contaminant to be detected, and the level of safety required by the application.
In recent years, this topic has become even more relevant in the food, pharma, and medical sectors, where traceability of plastic components and the ability to identify accidental fragments have become an integral part of quality control strategies. At LATI, we emphasize precisely this point: contamination from plastic fragments is a concrete risk, and traditional plastics are not easily detected by standard inspection systems.
How Magnetic Detectability Works
MDT compounds are developed to alter the magnetic field generated by metal detectors, making plastic particles identifiable that would otherwise go undetected. This allows the use of polymeric materials even in critical components, while maintaining a concrete possibility of detection in case of accidental breakage.
For many applications, magnetic detectability already represents a highly effective level of safety, especially if the line is properly designed and the detector is set consistently with the product and throughput speed.
When X-Rays Come into Play
In some cases, however, the metal detector alone is not sufficient. This is where compounds offering dual detectability become relevant—detectable by both metal detector and X-ray. The MDT09 grades represent an evolution of MDT technology precisely in this direction, thanks to the combination of fillers that enhance both magnetic response and radiopacity.
The MDT range covers multiple detectability levels: entry-level compounds start with MDT03-MDT04, MDT05 is recommended as standard for many applications, while from MDT07 upward, materials can also be detected with X-ray systems.
The Real Difference Is Not Just the Technology
Actual detectability depends on:
- particle size
- thickness
- shape
- orientation
- fragment dispersion in the product
- instrument sensitivity
- actual line conditions
The signal generated by the contaminant varies according to the geometric characteristics of the particle and the operating conditions of the detector. For this reason, in-line validation remains always decisive.
When to Choose a Magnetically Detectable Solution
A magnetically detectable solution may be appropriate when:
- the line is already equipped with well-calibrated magnetic metal detectors
- the minimum size of the contaminant to be detected is consistent with the chosen MDT level
- the component requires a good balance between cost, performance, and safety
- cross-checking with radiographic systems is not necessary
When Dual Detectability Makes Sense
Dual detectability becomes relevant when:
- the required level of control is higher
- working in highly sensitive supply chains
- the goal is to reduce false negatives
- the line already uses X-ray inspection
- reputational and recall risk is particularly high
Conclusion
The right question is not “what is the most detectable material in absolute terms?”, but which combination of material, detector, and application best reduces actual risk. The choice between magnetic detectability and dual detectability must be made by considering the line, the product being conveyed, the critical dimensions of the contaminant, and the required level of safety.
Do you need to determine whether magnetic detectability is sufficient for your application or if radiopacity is also required? Consult with LATI for a technical evaluation of the most suitable MDT grade.
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