All Polymnaget data is derived from in-house force testing in CMR’s magnet characterization lab. Where comparisons data is shown, results are of directly comparable magnets of the same size and grade under consistent conditions.
It is important to note that during testing, magnets are held parallel and aligned. Unconstrained application testing where magnets are not either parallel or aligned may give lower forces due to the magnet tilting away from target during engagement and disengagement.
By contrast, most magnet force and pull strength data on the internet does not represent real-world conditions. Rather, most of it is from idealized conditions that dramatically overstate the forces that can be achieved in product design by 2x or more. It is therefore not very helpful to product designers looking for accurate data.
It is common to see magnet data on the internet described as coming from Case 1 or Case 2 configurations, which are idealized scenarios.
Case 1 is the maximum pull force generated between a magnet and an “infinitely” thick piece of steel.
Case 2 is the maximum pull force generated from a magnet sandwiched between two “infinitely” thick pieces of steel against another “infinitely” thick piece of steel.
It’s obvious why these scenarios are idealized. It is critical to understand the source of the data used for prototyping and product design and rely only on real world test data.