No. NuMetal Epoxy Putty does not contain any ferromagnetic steel particles. It's a two-part epoxy compound, not a metal-filled putty, so it won't introduce magnetic interference or conductivity into a repair, even though it cures to a steel-hard finish.
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Key Facts: NuMetal & Ferromagnetic Content NuMetal is a two-part epoxy putty, not a metal-filled compound. It contains no steel particles, powder, or filings of any kind, and it carries a dielectric strength of 300 volts/mil (ASTM D149), confirming it insulates rather than conducts electricity. |
What NuMetal Epoxy Putty Is Made Of
NuMetal mixes like clay: Part A and Part B are cut in equal amounts, kneaded together by hand at a simple 1:1 ratio, and molded directly onto the repair. Once cured, it hardens into a steel-hard, sandable, drillable solid. The "steel" in the name describes how it performs after curing, not what it's made of. There is no metal powder, filings, or ferromagnetic material mixed into the epoxy at any stage.
Why This Matters for Sensitive Equipment
Because NuMetal contains no ferromagnetic particles, it won't attract a magnet, throw off a compass or magnetic sensor, or create an electrical short if it's applied near exposed contacts. That combination of properties is what makes it a practical choice for repairs on marine electronics housings, instrument panels, sensor enclosures, and any other high-end application where a magnetic or conductive filler would be a dealbreaker.
| Property | Rating |
|---|---|
| Bond Strength (ASTM D1002) | 375 psi |
| Tensile Strength (ASTM D412) | 4,000 psi |
| Compressive Strength (ASTM D695) | 12,000 psi |
| Dielectric Strength (ASTM D149) | 300 volts/mil |
| Mix Ratio | 1:1 (Part A to Part B) |
| Hardening Time at 75°F (ASTM D2471) | ~60 minutes |
| Shrinkage at 75°F (ASTM D2566) | None |
Pro Tip NuMetal is available in Black, Grey, White, and Tan. All four share the identical epoxy formula, so pick the color based on what blends best with the surface you're repairing, not on any performance difference. |
Frequently Asked Questions
Does NuMetal Epoxy Putty contain ferromagnetic steel particles?
No. NuMetal Epoxy Putty does not contain any ferromagnetic steel particles. It is a two-part epoxy compound, not a metal-filled putty, so it will not interfere with magnetic fields or sensitive equipment.
What is NuMetal Epoxy Putty actually made of?
NuMetal is a two-part epoxy putty. Part A and Part B are kneaded together by hand in a simple 1:1 ratio, and the epoxy cures into a rock-hard solid. Despite the name and its steel-like hardness once cured, it does not contain metal powder, filings, or particles of any kind.
Is NuMetal Epoxy Putty electrically conductive?
No. NuMetal carries a dielectric strength of 300 volts/mil (ASTM D149), meaning it is an electrical insulator rather than a conductor. This is consistent with an epoxy-based formula with no embedded metal content.
Does the color of NuMetal (Black, Grey, White, or Tan) affect its magnetic or electrical properties?
No. All four NuMetal colors share the same epoxy formulation. The color only affects the cosmetic finish of the repair, not the material's non-ferromagnetic or non-conductive properties.
Can NuMetal Epoxy Putty be used on damp surfaces or underwater?
Yes. NuMetal bonds to damp surfaces and will fully cure even underwater, which makes it a common choice for pool, spa, marine, and plumbing repairs in addition to non-ferromagnetic applications.
Ready to Start Your Repair? Shop NuMetal Epoxy Putty in Black, Grey, White, or Tan, or review the full mixing and application directions before you start. Shop NuMetal Epoxy Putty View Mixing & Application Directions |