Customer's original design: NdFeB disc of D 1"x 1/8", N42
Force required: 17 lbs
1) NdFeB pot magnet with screw hole, overall size D25x8mm
2) Rubber coated magnet with screw hole, overall size D31x6mm
Price: NdFeB disc > rubber coated magnet > pot magnet
Force: pot magnet (36 lbs) > rubber coated magnet (20 lbs) > NdFeB disc (17 lbs)
Anti-corrosion: rubber coated magnet > pot magnet > NdFeB disc
Anti-scratch: rubber coated magnet > pot magnet, NdFeB disc
Anti-risk ability against NdFeB price increase: pot magnet > rubber coated magnet >NdFeB disc
Final decision: rubber coated magnet to replace NdFeB disc in original design
From above comparison, it is obvious that rubber coated magnet beats others in its anti-corrosion and anti-scratch properties. Besides, even though it does not produce the highest force, it falls in acceptable range for the customer. When these pros are added up, it makes rubber coated magnet stand out from others with its great value vs price performance.
The other important feature of our products that gives the customer high motivation to change is the anti-risk ability against NdFeB price increase:
To get the same force, NdFeB magnet used in either pot magnet or rubber coated magnet is much less than using a whole piece of NdFeB magnet.
Diluted by other material such as rubber or steel, NdFeB is not that dominant in the cost composition of either pot magnet or rubber coated magnet, with which the price curve of these magnetic assemblies is milder over the time than that of NdFeB magnet.