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Difference between Armstrong RB Magnetic Assembly and Others in Market

Posted on August 28, 2016

When you look at the images of Armstrong RB magnetic assemblies and compare to the ones at other vendors’ websites, you might automatically think all of them are exactly the same.

Yes, these magnetic assemblies from different suppliers have almost sameness in appearance covered in Chrome or Nickel plated steel cups, in dimensions and in holding forces. Consequently, the purchase selection among the vendors would be the price only!

Wait a moment before ordering the magnetic assembly and please take a closer look at them. See the inside of them in order to understand how the Ceramic ring magnets are bonded to the round steel cups.

There are two methods of bonding the Ceramic ring magnet and the steel cup. One method is that the RB steel cup assembly is bonded only between the bottom of the Ceramic ring magnet and the steel cup. Armstrong Magnetics adopted and ended this bonding method long time ago, while most fabricators still use this method currently.

In a drop test we carried out a few years ago, the magnetic assembly could be disintegrated into the Ceramic ring magnet and the steel cup after it free falls to concrete floor at elevation of 4 feet.  We found that only bonding the bottom of the Ceramic ring magnet and the steel cup was not sufficiently strong.

Since then, we have abandoned the bond method described above. Now every Armstrong RB steel cup magnetic assembly is bonded with black epoxy fully filling the gap between the outter round side of the Ceramic ring magnet and the inner round side of the steel cup. By using this new bonding method, Armstrong RB steel cup magnetic assemblies are strong as a solid unity. It could survived from drops as high as 10 feet.