Brass powders

Brass powder grades and compositions

Three published compositions: 80/20 at Zn 19 to 22%, 70/30 at Zn 28 to 32% and 60/40 at Zn 39 to 41%, all at -325 mesh with controlled sieve analysis. Oxygen is held to 0.4% max, tightened to 0.2% max on the 60/40 grade where zinc content is highest. They are in production duty on two fronts at once: decorative and aesthetic surface finishing, and matrix or filler material in diamond tool manufacturing.

See: Brass powder grades, Compared with Kymera, Nippon Atomized and Pometon

Brass powder for diamond tools

Brass works in a segment as matrix or filler, and the variable that decides how it behaves is oxygen rather than headline composition. Our sheet publishes an oxygen ceiling; Kymera and Pometon do not publish one, and Nippon Atomized publishes 0.4 mass% on its super-fine SF-BS6040 grade only. That is the number worth comparing before the composition table.

See: Oxygen limit row

Copper zinc powder supplier for decorative finishing

Decorative and aesthetic surface finishing is one of the two duties this range is already in production for, alongside diamond tool matrix and filler work. All three compositions are -325 mesh with controlled sieve analysis and a published oxygen ceiling, which is what keeps colour consistent between batches. Kymera's most common grades are sold at -60 or -100 mesh, so the cuts are not directly interchangeable.

See: Particle size comparison

Why does oxygen content matter more in brass powder than in copper?

Zinc oxidises faster than copper and volatilises during sintering, so oxygen entering the furnace shifts both the final composition and the finish. In a decorative application that changes colour; in a diamond segment it changes bond hardness and diamond retention. That is why we publish a ceiling of 0.4% max, and 0.2% max on the 60/40 grade where zinc content is highest.

See: Oxygen and composition rows

Do you publish apparent density for brass powder?

No, and it is logged as a gap. Kymera publishes 3.0 to 3.7 g/cm³ and Nippon Atomized publishes 2.90 to 3.35 g/cm³ per grade, and Nippon Atomized also publishes flow under 25 s/50 g on both -100# grades. If your tooling is set to a fill density, ask for the batch figure before you order rather than after the first press run tells you.

See: Apparent density and flow rows

Coarse brass powder for structural P/M pressing

We do not publish one. The range is -325 mesh across all three compositions, aimed at fine finishing and diamond tool duty. Kymera publishes -60 mesh material below 250 µm and Pometon publishes irregular shapes from 500 down to 45 microns, so for a structural brass part pressed at a coarse cut they are the right suppliers. Saying so costs us an enquiry and saves you a failed trial.

See: Size range comparison

Brass powder supplier for a manufacturer avoiding US and EU jurisdictions

Kymera is a United States producer, Nippon Atomized is Japanese and Pometon is Italian, each stated by their own published material. Our brass comes from an independent, non-aligned producer under an ISO 9001:2015 system, in current production supply for both finishing and diamond tool duty. On published apparent density and flow the Japanese and American sheets are deeper, and we would rather you knew that before ordering.

See: Brass comparison table, Brass powder line

Which brass composition should we use, 80/20, 70/30 or 60/40?

Zinc content drives both colour and sintering behaviour, so the choice usually follows the duty rather than a strength target. Higher zinc means more volatilisation risk in the furnace, which is why the 60/40 grade carries the tighter 0.2% max oxygen ceiling. For a finish, choose by the colour you need and then control oxygen; for a segment, choose by the bond hardness your recipe expects and trial it.

See: Composition and oxygen rows

Fine brass powder at -325 mesh with controlled sieve analysis

All three compositions are published at -325 mesh with controlled sieve analysis, which is the cut fine finishing and diamond segment work need. Nippon Atomized publishes a comparable fine range and adds a super-fine SF-BS6040 grade, while Kymera's most common grades sit at -60 or -100 mesh. If you are matching an existing fine-cut specification, this range maps to it directly.

See: Particle size rows

How do we compare brass suppliers when each publishes a different set of numbers?

Line up the parameters, not the marketing. Kymera publishes apparent density and morphology but no oxygen ceiling; Nippon Atomized publishes apparent density, flow and a full sieve distribution, with oxygen on one super-fine grade; Pometon publishes compositions and a size span. We publish compositions, mesh, sieve control and oxygen. Then request from each supplier the parameters they omit, in writing, and compare the replies rather than the websites.

See: Attribute-by-attribute brass comparison

Our decorative finish drifts in colour between batches. Is the powder the likely cause?

Often, and oxygen is the first thing to check. Zinc oxidises and volatilises during sintering, so a batch arriving with more oxygen leaves the furnace with a different zinc balance and a different colour, even when the incoming composition certificate looks correct. Specify the oxygen ceiling contractually, test it on arrival, and keep the mesh constant while you diagnose so you are only changing one variable.

See: Brass powder oxygen control, Why oxygen decides brass behaviour

Is there any advantage to buying brass from the same house as the rest of a diamond bond recipe?

Yes, when brass is one constituent among several. Segment performance comes from how copper, bronze, brass, iron-copper, nickel and tin interact, so if each arrives from a different mill the bond variance is the sum of several tolerances and no single supplier owns the result. All of those constituents come from one line here, under one ISO 9001:2015 system, which makes a retention problem one conversation instead of five.

See: Diamond tool matrix line, Constituents from one supplier

A national tooling industry wants to stop importing brass powder. What is realistic in the first year?

Substituting the fine finishing and diamond tool grades is realistic, because those are the cuts already in production supply here at -325 mesh with published oxygen control. Substituting coarse structural pressing grades is not, because we do not publish one. Start where the grades map, qualify against oxygen and mesh with a full production batch, and treat the coarse end as a development conversation rather than a purchase order.

See: Published brass grades, Gaps we log openly

What should a buyer ask that a brass powder datasheet never answers?

Three things. What the batch-to-batch spread of apparent density actually is, not the range on the sheet. What happens to lead time if you double the order. And who owns the production, because an invoice address and a supply chain are different objects. The published numbers matter, but they are the part every supplier has already optimised for reading.

See: What each vendor publishes

Can you match a brass composition outside 80/20, 70/30 and 60/40?

Custom powder development to programme specification is part of the wider line, so an intermediate zinc content is a development question rather than a catalogue lookup. Kymera also states it accommodates specialised alloys. What we will not do is list a composition before it has been made and measured, so treat the published three as what is in production today rather than the limit of what can be made.

See: Custom powder development, How our powder range compares

What are Brass powders?

Brass powders are Unstrat's Land (Land Domain) capability: Copper–zinc alloy powders used in decorative and aesthetic surface finishing, and as a matrix or filler material in diamond tool manufacturing. Three grades, 80/20, 70/30 and 60/40, at -325 mesh with controlled oxygen levels for consistent pressing and sintering behaviour.

How do Brass powders work?

Brass powders deliver their effect through used in decorative and aesthetic surface finishing applications, Matrix or filler material in diamond tool manufacturing and 80/20, 70/30 and 60/40 copper–zinc compositions, capabilities matched to the requirement and confirmed under briefing rather than published.

Who makes Brass powders?

Brass 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 Brass powders over a major-power alternative?

Brass powders are sourced from an independent, non-aligned manufacturer, so they carry no major-power disclosure rules, upgrade-locks or political ramifications. Concretely: three controlled compositions with oxygen held to 0.2–0.4% max for consistent pressing and sintering. The capability is accountable to you, not to a foreign vendor's government and its release schedule.

How are Brass powders procured, and where can it be exported?

Copper–zinc powders that do double duty: decorative and aesthetic surface finishing on one side, matrix and filler material for diamond tool manufacturing on the other. 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. Brass powders are then sustained in-region by one accountable team from briefing through long-term operation.