High-Visibility Red, Polarity Indication, Superior Epoxy Bond
We supply High-Strength Neodymium Cylinders coated in a durable Red Epoxy finish.
Standard Nickel magnets are prone to corrosion and look identical regardless of orientation.
Our Red Epoxy coating provides a distinct advantage:
Universal Coding:
Red is the industry-standard color for identifying the North Pole or the “Active” side of a magnet assembly.
Corrosion Shield:
It creates a hermetic resin seal that withstands moisture and salt spray far better than standard metallic plating.
The Engineering Logic: Why Red Epoxy?
Using Red Epoxy is a strategic manufacturing decision.
1. Instant Polarity Verification:
The Problem:
If a worker installs a sensor magnet upside down (South facing out instead of North), the device fails.
The Solution:
By using Red Epoxy for the North-facing magnet (and Blue or Silver for South), you eliminate assembly errors.
The operator knows: “Red side up.”
No Gauss meter is required.
2. High-Visibility Safety:
The Application:
Safety Interlocks and Kill Switches.
The Logic:
In industrial machinery, Red signifies “Stop” or “Danger.”
A Red Epoxy magnet visually communicates its function as a safety trigger.
You can distinguish it from other structural magnets in the machine.
3. Superior Glue Retention:
The Problem:
Nickel plating is slick.
Magnets glued into drilled holes often pull out.
The Solution:
Red Epoxy is a textured resin.
It bonds chemically with industrial adhesives (Loctite/Epoxy).
And provides a much stronger hold than gluing to bare metal.
Thickness & Temperature
Epoxy is a functional coating, not just paint.
It affects dimensions.
1. The “Press-Fit” Warning:
The Spec:
Standard Nickel plating is thin (~15 microns).
Red Epoxy is 20 – 30 microns thick.
The Risk:
If you drill a hole for a standard magnet, the Red Epoxy version might be too tight.
The coating can shear off if forced into a sharp-edged hole.
Our Advice:
Please design your housing hole 0.05mm – 0.10mm larger than the magnet diameter to accommodate the coating.
2. Temperature Limit:
The Limit:
Standard Epoxy begins to soften or darken around 120°C (248°F).
The Warning:
Do not use Red Epoxy magnets in high-heat motor applications (>150°C).
For those, we recommend Red High-Temp Paint or Chemical Passivation.
Ideal Applications
Hall Effect Sensors: Identifying the North Pole trigger magnet.
Safety Switches: Magnetic keys for treadmill stops or heavy machinery interlocks.
Educational Kits: Teaching magnetism (Red=North, Blue=South).
Outdoor Equipment: Sensors exposed to rain/humidity where Nickel would rust.
Ordering Guide
To ensure the correct configuration, please specify:
1). Coverage:
Full Coating: (The entire cylinder is Red).
Pole Face Only: (Only one flat end is sprayed Red to mark North).
2). Dimensions: Diameter x Length.
3). Grade: N35, N42, N52?
4). Adhesive: “Will you be gluing this?” (We can treat the surface for maximum bond strength).
