Epoxy-Coated Neodymium Magnets: China factory supplier that Survive Saltwater, Rain & Wet Industrial Environments
2026-01-02
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When standard neodymium magnets rust, fail, or lose strength in wet environments, epoxy-coated neodymium disc magnets keep working. For marine equipment, outdoor signage, or wet industrial setups, these aren’t just “magnets” — they’re a long-term solution to the #1 problem with permanent magnets: corrosion.
The Hidden Cost of “Standard” Magnets in Wet Environments
You buy a pack of neodymium magnets for your boat’s storage compartment. A month later, they’re covered in rust. You mount outdoor signage with regular magnets — after a rainy season, they peel, lose strength, and the sign crashes to the ground. For wet industrial setups (like food processing or water treatment), replacing rusted magnets eats into your budget and causes downtime.
Standard neodymium magnets rely on thin NiCuNi plating — fine for dry spaces, but no match for saltwater, rain, or high humidity. They rust, crack, and lose up to 50% of their strength in 6 months.
Epoxy-Coated Disc Magnets: IP68 Protection + Unbeatable Strength
Our epoxy-coated neodymium disc magnets solve this with a double-layer defense system:
- Base NiCuNi Plating: A corrosion-resistant foundation that blocks initial moisture.
- 200μm Thick Epoxy Coating: A waterproof, scratch-proof barrier that achieves IP68 rating — meaning they’re fully submersible in water (up to 10m depth) and dust-tight.
The result? These magnets pass 1000+ hours of salt spray testing (5x longer than standard magnets) — no rust, no cracking, no loss of strength.
And here’s the best part: The epoxy coating doesn’t weaken the magnet. A N52 epoxy disc (Φ10mm×5mm) pulls 15kg — the exact same strength as an uncoated N52 magnet. You get all the power of rare earth magnets, plus the durability to survive harsh wet environments.
What You Can Do With These Magnets (That Standard Magnets Can’t)
- Marine & Boating: Mount equipment in saltwater compartments, secure fishing gear, or fasten aquaculture nets — no rust, even after months of immersion.
- Outdoor Signage: Hang billboards, garden decor, or light fixtures that stay put through rain, snow, and UV exposure (no sign crashes, no re-mounting).
- Wet Industrial Setups: Fasten tools in high-humidity warehouses, secure food processing line parts, or organize water treatment equipment — cut downtime from rusted magnet replacements.
- Household Wet Areas: Hold bathroom accessories, weight shower curtains, or organize pool gear — they’ll never leave rust stains on your tiles.
Real-World Proof: Why These Magnets Outlast the Rest
A small boat repair shop switched to our epoxy disc magnets for their storage compartments. After 12 months of saltwater exposure, the magnets showed zero rust — and the shop cut magnet replacement costs by 75%.
A outdoor signage company used 4 N45 epoxy magnets (Φ15mm×5mm) to mount a 5kg billboard. After 2 years of rain/snow, the sign is still secure — and the magnets look brand new.
Stop Wasting Money on Disposable Magnets
Standard magnets are a “buy cheap, replace often” hassle. Our epoxy-coated neodymium disc magnets are an investment: They last 5x longer, require zero maintenance, and deliver consistent strength in the harshest wet environments.
Whether you’re a boater, a small business owner, or a DIY enthusiast — if you need magnets that survive water, salt, or humidity, these are the only ones that work.
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HuanTongcx is a custom magnet supplier which providing neodymium magnet, ferrite magnet, samarium cobalt magnet for various industries.
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