Overview
4N high purity iron powder refers to iron particles with 99.99% purity, specifically designed for research and advanced industrial applications. The '4N' designation indicates four nines purity (99.99%), distinguishing it from commercial-grade iron powders that typically range from 95-99.9% purity. This material is produced through sophisticated processes like hydrogen reduction of high-purity iron oxides or electrolytic refining, followed by precise particle size classification. The ultra-low impurity profile (typically <100 ppm total contaminants) makes it indispensable for experiments where trace elements could skew results or affect material performance.
Physical and Chemical Properties
The powder exhibits characteristic ferromagnetic behavior with high intrinsic saturation magnetization (~218 emu/g). Particle sizes commonly range from 1-100 microns, with spherical or irregular morphology depending on production method. Specific surface area varies from 0.1-5 m²/g, influencing reactivity and sintering properties. Chemically, the material maintains exceptional stability under inert conditions but oxidizes readily in air, especially at elevated temperatures. Its electrical resistivity (9.71 μΩ·cm at 20°C) and thermal conductivity (80.4 W/m·K) are critical for electronic applications. The powder's flowability and tap density are carefully controlled for manufacturing processes like metal injection molding.
Main Applications
In research laboratories, 4N iron powder serves as a reference material for magnetic studies, calibration standards, and nanotechnology development. It's fundamental in synthesizing advanced alloys where trace impurities must be minimized to study intrinsic material properties. Industrial applications include additive manufacturing of high-performance components, where the powder's purity ensures consistent mechanical properties. The pharmaceutical industry uses it in magnetic drug delivery systems, while the energy sector employs it in battery research and catalyst development. Emerging uses include quantum computing materials and spintronics research.
Safety and Storage
As a combustible dust, the powder requires strict handling protocols per NFPA 652 standards. Static electricity control is essential during transfer operations, and local exhaust ventilation should prevent airborne dust accumulation (TLV: 5 mg/m³ for iron oxide fume). Storage recommendations include double-sealed aluminized bags with oxygen scavengers, preferably under argon atmosphere. Containers should be clearly labeled with hazard warnings and stored separately from oxidizers. Shelf life typically exceeds 2 years when properly sealed, though surface oxidation may occur over time even in inert packaging.
B2B Procurement Guide
Technical specifications should include certified purity analysis (GDMS or ICP-MS method), particle size distribution (laser diffraction report), and oxygen/nitrogen content. For sensitive applications, request lot-specific certificates with trace element breakdowns. Reliable suppliers typically offer customized particle morphologies (spherical, flake, or dendritic) and size cuts (e.g., -325 mesh). Bulk purchases (25+ kg) generally reduce costs by 20-40%. Consider MOQ requirements and lead times, as high-purity batches may require 4-8 weeks for production and quality testing. Shipping with dry ice or nitrogen purge is recommended for international orders.
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