High-surface-area iron powder, 300-450 ml O2/g capacity, food-contact grades. Absorber sachets, hand warmers, pharma packaging. Lot-certified reaction curves.
QUICK ANSWER
Oxygen-absorber iron powder is high-surface-area reduced or atomized iron (typically 45-150 µm with activated surface) that rusts on demand — reacting with atmospheric oxygen in sealed food packaging to drop oxygen below 0.1 percent, extending shelf life of snacks, coffee, pharmaceuticals, and dried goods. The same exothermic rusting reaction, run faster with salt and carbon catalysts, powers disposable hand warmers and heat pads.
This is iron powder as a chemical reagent: the product's value is its reaction kinetics. Oxygen absorber sachets contain iron powder, salt, and moisture-retaining agents, engineered so the iron oxidizes completely within 24-48 hours of sealing, pulling package oxygen to levels that stop mold, oxidation rancidity, and insect survival. Producers of absorber sachets buy iron powder on certified oxygen-uptake capacity and reaction rate — the two numbers that define whether a sachet meets its rated capacity. Hand warmer producers buy the same powder on heat-output curve and duration.
MATERIAL DATA
Lot-level controls focus on the chemistry, particle characteristics, and process values that influence manufacturing consistency and finished-part performance.
| Element | Content | Performance Role |
|---|---|---|
| Iron (Fe) | > 96 wt% | Reactive base metal — oxidizes exothermically to scavenge O2 |
| Metallic iron (Fe⁰) | > 90 wt% | Active fraction — determines oxygen capacity per gram |
| Surface area | 0.3-1.0 m²/g | Controls reaction rate — higher area, faster uptake |
| Carbon (C) | 0.1-0.5 wt% | Residual content; participates in galvanic acceleration |
| Oxygen (O) | 2-5 wt% (as surface oxide) | Controlled — excessive pre-oxidation wastes capacity |
Final limits can be aligned with the agreed purchase specification.
APPLICATIONS
Food packaging is the volume market: oxygen absorber sachets go into snack foods, coffee, tea, nuts, dried meat, pet food, and bakery products across Asia and increasingly worldwide — a market growing with packaged food penetration and clean-label preservation trends (absorbers replace chemical preservatives). Sachet manufacturers compound iron powder with salt and hydrogel or vermiculite carriers, and buy the powder on certified oxygen capacity and particle size consistency, in container-load recurring volumes with food-contact compliance documentation.
The warmth and wellness market follows: disposable hand warmers, body warmers, and heat pads — massive sellers in Japan, Korea, and winter sports markets — use iron powder with activated carbon, salt, and water in breathable pouches. The product specification is the heat curve: peak temperature, time-to-peak, and duration, all of which trace back to iron powder surface area and size distribution. Secondary uses include oxygen scavenging in pharmaceutical packaging, museum conservation, and industrial gas purification.
CHEMICAL & METALLURGICAL PROCESS POWDERS
CUSTOM SUPPLY
We supply absorber-grade iron powder in reduced and atomized types with certified metallic iron content, oxygen-uptake capacity, and particle size per lot. Warmer-grade activated powders with optimized heat curves, food-contact compliant documentation, and custom size distributions for specific sachet formulations are available. Not export-controlled.
We supply absorber-grade iron powder in reduced and atomized types with certified metallic iron content, oxygen-uptake capacity, and particle size per lot.
Warmer-grade activated powders with optimized heat curves, food-contact compliant documentation, and custom size distributions for specific sachet formulations are available.
MATERIAL COMPARISON
| Comparison Point | This Product | Atomized Iron Powder |
|---|---|---|
| Surface area | High (porous sponge structure) | Lower (dense particles) |
| Reaction speed | Fast — preferred for absorbers | Slower |
| O2 capacity per gram | High | Moderate |
| Cost | Moderate | Lower |
| Warmer heat curve | Sharp peak, shorter | Flatter, longer duration |
| Best use | Food absorber sachets | Long-duration warmers, blends |
TECHNICAL FAQ
Need a different chemistry, particle range, or processing route? Our material team can review the requirement and supply window.
Roughly one gram of iron per 300-450 ml of oxygen — sized to package headspace plus permeation over shelf life. We supply capacity curves per lot so your sachet design starts from certified uptake data.
Controlled purity (heavy metal limits), production under food-safety management, and migration-compliant documentation. Our food-grade lots ship with the compliance file your customers and regulators require.
Yes — peak temperature and duration are engineered through iron particle size, surface area, and blend ratios with carbon and salt. Send your target curve and we will develop the matched powder specification.
Sealed and dry, 24 months — the enemy is pre-oxidation from moisture. Our packaging is moisture-barrier sealed; store cool and dry, and rotate FIFO.
No. These are standard commercial products shipping without licensing requirements.
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