Copper powders
High-conductivity powders for sintering and infiltration
Overview
High thermal and electrical conductivity copper powders engineered for sintering and infiltration efficiency, with precise control over particle size, shape and purity, in grades to 99.6% minimum copper. Ideal for friction materials, electrical contacts and industrial bonding applications requiring superior heat management, from self-lubricating bearings to alternator brushes and catalysts.
High-conductivity copper powders with tight control of particle size, shape and purity: sintering and infiltration feedstock from an independent source rather than a foreign mill's fixed catalogue.
Capabilities
- Engineered for sintering and infiltration efficiency with superior heat management
- Cu LAD grades at -100 and -200 mesh for pressing and bonding duty
- Fine -325 mesh grade at 99.6% minimum purity with 0.2% max oxygen
- Flaky copper grade for low apparent-density applications
- Serves friction materials, electrical contacts, brazing, self-lubricating bearings and P/M parts
- Also used in alternator brushes, catalysts, chemical formulations and infiltrations
Specifications
| Type | Copper metal powders |
| Purity | Available under controlled technical briefing |
| Size range | Available under controlled technical briefing |
| Particle shape | Irregular; flaky grade available |
| Quality system | Available under controlled technical briefing |
| Origin | Independent / non-aligned |
Why Unstrat: the difference
Unstrat is the authorised global representative and distributor for this capability. It is already in service with a track record behind it, so you are buying something that has done the job elsewhere, not funding a first attempt. You are not the test bed.
Independent, non-aligned origin, with no political exposure to any major-power ecosystem.
One accountable team from first briefing through delivery and in-region sustainment.
Grades up to 99.6% minimum copper purity, with oxygen held to 0.2% max on the finest cut.
How it reaches you
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Procurement & sustainment
Classification and the end-user-certificate chain are confirmed before this capability is represented to your market.
Sourced from an independent manufacturer: no major-power disclosure rules or political conditions.
A single team responsible from first briefing through delivery: not a chain of foreign primes to integrate yourself.
Lifecycle support and operator training delivered in-region, building capability that outlasts the initial deployment.
Questions buyers ask
Copper powder for sintering and infiltration: which grade?
For infiltration and bonding duty the Cu LAD grades at -100 and -200 mesh are the intended cuts, and the -325 mesh grade at 99.6% minimum copper with 0.2% max oxygen is for finer work where conductivity and sintered response matter. A flaky grade covers low apparent-density applications. If your tooling is set to a fill density, tell us the target rather than the grade, because that figure is not on our published sheet.
See: Copper powder grades and purityCompared with Makin and Pometon
High purity copper powder supplier
Our published range runs 98.5 to 99.6% minimum copper depending on grade, with oxygen held to 0.4% max on the Cu LAD grades and 0.2% max on the -325 mesh grade. Makin's published irregular copper datasheet states 99% minimum copper with oxygen up to 0.75% max, and its product page lists purity families from above 98.5% to above 99.5%. On the published oxygen ceiling our sheet is the stricter one.
Copper powder for friction materials and electrical contacts
Those are two of the duties these grades are already in production for, alongside brazing, self-lubricating bearings, sintered parts, alternator brushes, catalysts, chemical formulations and infiltrations. High thermal and electrical conductivity with controlled particle size, shape and purity is the whole point of the line, and it is supplied under an ISO 9001:2015 system rather than offered as a development product.
Copper powder supplier without exposure to Chinese production
Check the group structure before the datasheet. Makin's own brochure states it is part of the GRINM family and works in close cooperation with GRIPM, which it describes as having the largest copper powder production base in China. Pometon is independently Italian and publishes fewer numbers. Our copper powders come from an independent, non-aligned producer with a standing import-substitution mandate, which is the relevant difference if your concern is chain provenance rather than shipping distance.
What is the oxygen limit on your copper powder and why does it matter?
0.4% max on the coarser Cu LAD grades and 0.2% max on the -325 mesh grade. Oxygen drives green strength, sintered conductivity and how much work your furnace atmosphere has to do to reduce it. A powder that arrives at 0.75% max oxygen is not unusable, it just moves the burden downstream into hydrogen consumption and scrap. That is the one published parameter where our sheet is tighter than a European major's.
See: Oxygen limit row
Do you offer spherical or dendritic copper powder?
No. Our published morphology is irregular, with a flaky grade for low apparent-density applications. Makin publishes irregular water-atomised, spherical at around 5.0 g/cc apparent density and dendritic electrolytic grades, and Pometon publishes atomised, electrolytic and reduced electrolytic routes. If your process depends on dendritic interlocking or spherical flow, they can supply it and we cannot, and it is better you hear that now than after a trial.
Copper powder for self-lubricating bearing production at volume
Bearing work sits squarely inside what these grades already do, along with friction materials and P/M parts. The published data covers purity, oxygen, mesh and morphology. What it does not cover is apparent density, which is the first parameter a press engineer screens on and which Makin publishes across four families at 1.9 to 3.7 g/cc. Ours is measured per batch, so ask for the figure against the grade before you commit tooling.
Copper powder as part of a diamond segment recipe
Copper is usually the bulk of the bond, so its purity and oxygen set the baseline the rest of the matrix works against. The advantage of taking it from this line is that the bronze, brass, iron-copper, nickel, tin and stainless constituents come from the same house under the same quality system, which makes bond variance one supplier's responsibility rather than four.
Our press is tooled to a specific fill density. Can you match it if you do not publish apparent density?
Probably, but not from the website, and we would rather you asked than assumed. Apparent density is measured per batch and issued on request; it is simply not on the published sheet yet, and we have logged that as a gap. Send the target fill density and the grade you are replacing, and the answer comes back as a measurement against your number rather than a range that happens to include it.
How should a manufacturer choose between a supplier with deeper published data and one with an independent supply chain?
Split the decision by what fails. Published depth reduces design risk, and Makin publishes four apparent density families, three morphologies and UN-approved pack sizes, which shortens qualification. Independence reduces continuity risk, which only shows up once and then costs a production year. If the part is commercial and replaceable, buy documentation. If the line is strategic and the powder is the start of it, buy the chain and demand the measurements contractually.
We are substituting imported copper powder in a national programme. What goes wrong first?
Usually the furnace, not the press. A change in oxygen content or particle morphology shifts sintered conductivity and green strength before anyone notices a dimensional problem, so first-pass yield drops for reasons the incoming inspection did not test for. Qualify against oxygen, purity and mesh together, run a full production batch rather than a sample, and hold the supplier to the same numbers on the second delivery as the first.
Is copper powder really a strategic material, or are we over-thinking a commodity?
It behaves like a commodity right up to the moment it stops arriving. Copper powder feeds bearings, contacts, brake materials and sintered parts across defence and civil production, it is cheap relative to what it goes into, and the supplier base is consolidating into a few groups. Cheap and hard to substitute quickly is the profile of a good pressure point, which is why chain provenance is a reasonable question even here.
See: Independent copper powder supplyGroup structure and provenance
Can you develop a copper grade that is not in your published range?
Custom powder development to programme specification is part of the wider line, so an off-catalogue cut or purity target is a conversation rather than a catalogue lookup. What we will not do is list a grade before it has been made and measured, which is why the published sheet is shorter than some of our competitors' catalogues. Bring the specification and the volume, and the answer will be a trial batch with numbers on it.
Flaky copper powder for low apparent-density work
The flaky grade exists for exactly that: applications where a low apparent density is the point rather than a problem. It sits alongside the irregular Cu LAD grades and the fine -325 mesh cut in the same line. Makin's equivalent low apparent-density family is its NLD range at 1.9 to 2.9 g/cc, published with figures we do not currently put on the page.
See: Copper grades including the flaky cutMorphology comparison
What evidence travels with a delivery, and what should we test on arrival?
The grades are supplied under an ISO 9001:2015 system, and purity, oxygen and mesh are the published control parameters, so those are the ones to verify on receipt. Add apparent density to your incoming test even though it is not on our sheet, because it is the parameter most likely to drift and the one your press will feel first. A supplier that objects to being measured on delivery is telling you something useful.
Copper powders: questions
What are Copper powders?
Copper powders are Unstrat's Land (Land Domain) capability: High thermal and electrical conductivity copper powders engineered for sintering and infiltration efficiency, with precise control over particle size, shape and purity, in grades to 99.6% minimum copper. Ideal for friction materials, electrical contacts and industrial bonding applications requiring superior heat management, from self-lubricating bearings to alternator brushes and catalysts.
How do Copper powders work?
Copper powders deliver their effect through engineered for sintering and infiltration efficiency with superior heat management, Cu LAD grades at -100 and -200 mesh for pressing and bonding duty and Fine -325 mesh grade at 99.6% minimum purity with 0.2% max oxygen, capabilities matched to the requirement and confirmed under briefing rather than published.
Who makes Copper powders?
Copper powders are built by The Specialty Alloys Producer, whose focus is tungsten heavy alloys & specialty metal powders. Unstrat represents The Specialty Alloys Producer to government and enterprise buyers worldwide as an independent, non-aligned prime vendor.
Why choose Copper powders over a major-power alternative?
Copper powders are sourced from an independent, non-aligned manufacturer, so they carry no major-power disclosure rules, upgrade-locks or political ramifications. Concretely: grades up to 99.6% minimum copper purity, with oxygen held to 0.2% max on the finest cut. The capability is accountable to you, not to a foreign vendor's government and its release schedule.
How are Copper powders procured, and where can it be exported?
High-conductivity copper powders with tight control of particle size, shape and purity: sintering and infiltration feedstock from an independent source rather than a foreign mill's fixed catalogue. Every engagement begins with a briefing, and export eligibility is confirmed per market under briefing rather than published. Where controlled capabilities are involved, the classification and end-user-certificate chain is confirmed first. Copper powders are then sustained in-region by one accountable team from briefing through long-term operation.