45-630µm spherical bronze in five certified cuts for porous elements. 5-200µm filtration ratings, lead-free compliant, sintering support included.
QUICK ANSWER
Spherical bronze powder (CuSn10, 45-630 µm graded cuts) is gas-atomized tin bronze in true spherical form, designed for sintering into porous bronze filters, silencers, and fluidizing elements. The spherical shape sinters into controlled, uniform porosity (30-50 percent) that filters, diffuses, and silences — the standard porous metal medium for pneumatic, hydraulic, and process industries.
Filter bronze is a shape story: only spherical powder sinters into the smooth, interconnected pore network that gives predictable filtration ratings and cleanable performance — irregular powders make erratic pores. The powder is loose-sintered in molds (no compaction pressure), bonding at particle contact points into rigid porous elements with filtration ratings from 5 to 200 microns set by the powder's size cut. Filter manufacturers buy on size-distribution tightness (the rating depends on it), sphericity, and chemistry per CuSn10 or CuSn8 specifications — a mature, specification-stable market with steady recurring demand.
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 |
|---|---|---|
| Copper (Cu) | 88-91 wt% | Bronze matrix — corrosion-resistant, thermally conductive |
| Tin (Sn) | 9-11 wt% | Bronze former — strength and sintering behavior |
| Phosphorus (P) | 0-0.3 wt% (some grades) | Sintering aid improving particle bonding |
| Oxygen (O) | < 0.15 wt% | Low oxide for clean sintering bonds |
| Impurities | < 0.5 wt% total | Chemistry per CuSn10/CuSn8 specification |
Final limits can be aligned with the agreed purchase specification.
APPLICATIONS
Pneumatic silencers and filters are the volume market: every pneumatic system vents through sintered bronze silencers that muffle exhaust noise and trap contaminants, and pneumatic filter-regulators use bronze elements for air cleaning — products made by the millions for industrial automation. The powder's size cut sets the element's flow-versus-rating balance, and manufacturers buy graded cuts on certified distribution, because a wide distribution blurs the filtration rating their products are sold on.
Process and fluid applications form the engineered market: hydraulic and fuel filters, chemical process filters (bronze tolerates many media), fluidizing pads for powder silos (air diffuses through the bronze to aerate cement and powders), sparging elements, flame arrestors (the porous metal quenches flame propagation), and flow restrictors. Each application maps to a size cut and porosity target, and element producers value the bronze's cleanability — backflushed and reused for years.
SPECIALTY & COMPOSITE POWDERS
CUSTOM SUPPLY
We supply spherical bronze in five standard size cuts (45-630 µm) with certified distribution and sphericity, CuSn10 and CuSn8 chemistries, and phosphorus-bearing sintering-aid variants. Custom cuts for specific filtration ratings, pre-alloyed low-lead and lead-free compliant grades, and sintering parameter support for element producers are available. Not export-controlled.
We supply spherical bronze in five standard size cuts (45-630 µm) with certified distribution and sphericity, CuSn10 and CuSn8 chemistries, and phosphorus-bearing sintering-aid variants.
Custom cuts for specific filtration ratings, pre-alloyed low-lead and lead-free compliant grades, and sintering parameter support for element producers are available.
MATERIAL COMPARISON
| Comparison Point | This Product | Irregular Bronze Powder |
|---|---|---|
| Pore structure | Uniform, predictable rating | Erratic — wide effective rating |
| Permeability at rating | High — open smooth pores | Lower — tortuous paths |
| Cleanability | Excellent — backflushable | Poor — traps particles |
| Sintering behavior | Loose-sinter, shape-holding | Needs compaction |
| Element strength | Good | Variable |
| Best use | Rated filters, silencers, fluidizing | Structural PM parts (see Cat 1) |
TECHNICAL FAQ
Need a different chemistry, particle range, or processing route? Our material team can review the requirement and supply window.
Roughly, the nominal rating runs at one-fifth to one-tenth of the powder cut's lower bound — a 90-160 µm cut gives about a 20-30 µm rated element. We publish rating-per-cut reference data and verify with your prototype elements.
Loose-sinter in molds at 800-860 °C under reducing atmosphere (dissociated ammonia or hydrogen), 20-60 minutes. Our lots include recommended cycles; over-sintering collapses porosity, under-sintering leaves weak bonds.
Yes — our standard CuSn10 contains no lead additions and meets RoHS and drinking-water-relevant requirements. Certificates accompany each lot.
Yes — sintered bronze machines well with sharp tooling; keep cutting fluids compatible with the porous structure and clean before service. Many silencers are sintered net-shape with machined threads.
No. Bronze powders ship without licensing requirements.
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