Umicore sells you the bond. We sell you every constituent of it.
Cobalite and its cobalt-based relatives are the reference pre-alloyed bonds. The alternative is a matrix built from copper, bronze, brass, iron-copper, nickel, tin and stainless powders from a single house, with the composition under your control.
The matrix line is in production supply to cutting and grinding segment makers, drawing on grades that are themselves in service across bearings, friction parts and P/M components, under an ISO 9001:2015 system.
Side by side
| Attribute | Represented by UnstratDiamond tool matrix powders | Umicore (Cobalt & Specialty Materials)Cobalite pre-alloyed powders and diamond tool metal bond range12Belgium and France | Nippon Atomized Metal Powders CorporationBronze grades S8515, S8020, S6733, S5050 as metal bond materials3Japan | Makin Metal Powders (UK) LtdCopper, bronze and zinc bronze powders for diamond tooling457United Kingdom |
|---|---|---|---|---|
| Bond concept12345 | Blended matrix from named constituent powders, with composition setting bond hardness, diamond retention and segment wear | Cobalt powders plus pre-alloyed powders in the Cobalite, NEXT, Keen and STEP ranges, with additive powders (tungsten, tungsten carbide, fused tungsten carbide, copper, tin, bronze, iron) | Individual bronze alloy grades sold as metal bond materials for diamond tools | Individual copper, bronze and zinc bronze grades with diamond tooling named as an application |
| Constituents from one supplier137 | Copper, bronze, brass, iron-copper, nickel, tin and stainless grades | Cobalt, pre-alloys, tungsten, tungsten carbide, fused tungsten carbide, copper, tin, bronze and iron | Copper, bronze, brass and iron-based alloy powders | Copper, bronze, zinc bronze, tin and infiltrants |
| Cobalt in the bond21Cobalt bonds perform well and carry responsible-sourcing scrutiny. Which matters more is the buyer's call. | No cobalt grade published in the line | Cobalt is the base metal of the Cobalite range; Cobalite HDR is published as a cobalt pre-alloyed powder | Not published | Not published |
| Published composition of the bond235 | Constituent compositions published per grade, for example bronze 90/10 to 62/38 and brass 80/20 to 60/40 | Not published. The Cobalite HDR page gives metal, physical state, colour, application and packaging only, with composition available on request | Cu and Sn percentages published per grade (85/15, 80/20, 67/33, 50/50) | Cu, Sn and Zn ranges published per product group |
| Particle size37 | Constituent grades published mainly at -325 mesh (45 µm) | Not published on the product pages | -325# cuts published with sieve distributions for the bond grades | Less than 45 µm cuts published, plus ultra-fine powders at d(0.50) of 5, 10 and 20 microns |
| Liquid-phase sintering aid16 | High-purity tin at 99.6% min, -325 mesh, for bond densification | Tin listed among additive powders; no grade data published | Not published in the bronze range | Tin powder at Sn 99.85% min, 0.15% max oxygen, cuts to -600# |
| Bond hardness control lever137 | Nickel grades: 99.6% min nickel, Ni-Cr-Fe-Si-B self-fluxing alloy, nickel silver | Pre-alloy selection across Cobalite, NEXT, Keen and STEP ranges depending on the material being cut | Alloy selection between bronze grades from 85/15 to 50/50 | Grade selection across copper, bronze and zinc bronze families |
| Packaging24 | Not published | 25 kg drums, or 5 x 5 kg drums | Not published | UN-approved 25 kg sacks, 25 to 250 kg drums, 250 to 1,000 kg bulk bags |
| Quality system7 | ISO 9001:2015 | Not published on the product pages | Not published on the product page | ISO 9001 and ISO 14001 |
Competitor values are quoted from the vendor documents listed under Sources, as published on the date shown. Configurations vary, so treat every row as a starting point for the evaluation rather than a like-for-like test result.
What the table means
Pre-alloy or blend is a real engineering choice
A cobalt pre-alloy like Cobalite arrives with its metallurgy already decided, which is why it is the industry reference: consistent, well understood, and quick to qualify. A blended matrix puts the composition back in the tool maker's hands, which is slower to develop and cheaper to adjust when the stone or the concrete changes. Neither is right in general. What is not defensible is choosing a pre-alloy because nobody offered you the constituents from one source.
What Umicore publishes, and what it does not
Umicore's public product pages give metal, physical state, colour, application and packaging. Composition, particle size and apparent density come with a quote request. That is a normal commercial posture for a pre-alloy business, since the composition is the product. It does mean a buyer comparing on published data cannot compare at all, and should ask for the technical data sheet before drawing conclusions in either direction.
Cobalt carries more than a price
Cobalt bonds are technically strong and commercially exposed. Price volatility is one part; responsible-sourcing due diligence on cobalt is another, and it lands on the tool maker as much as on the powder supplier. A matrix built from copper, bronze, brass, iron-copper, nickel, tin and stainless constituents sidesteps that whole conversation. For some segment applications it will not perform as well, and a supplier who tells you otherwise without a cutting trial is guessing.
Questions buyers ask
What is the best alternative to Umicore Cobalite for diamond segment bonds?
It depends on whether you want a pre-alloy or a recipe. Cobalite and the other Umicore ranges are cobalt-based pre-alloyed powders with a long track record, and Umicore also supplies the additive powders around them. Our line is the other model: copper, bronze, brass, iron-copper, nickel, tin and stainless constituents from one house, with composition under your control and no cobalt exposure. If your segments are qualified on a cobalt pre-alloy, switching means cutting trials, not a purchase order.
How does a cobalt-free matrix compare with a cobalt pre-alloy on cost of ownership?
Cobalt is the expensive and volatile constituent, and it brings responsible-sourcing due diligence with it. A copper, iron and nickel based matrix removes both, and lets you tune bond hardness by composition rather than by buying a different pre-alloy. The honest counterweight is qualification cost: a pre-alloy is bought and pressed, a blend has to be developed. Over a long production run that development is usually the cheaper half.
Why does buying all matrix constituents from one supplier matter?
Because segment performance is set by the interaction of the constituents, not by any one of them. When copper comes from one mill, bronze from another and nickel from a third, batch-to-batch variance in the bond is the sum of three suppliers' tolerances, and diagnosing a retention problem means three conversations. One house under one quality system makes the variance one supplier's responsibility.
Which suppliers publish enough data to compare bonds before buying?
Nippon Atomized publishes composition, apparent density and sieve distribution per bronze bond grade, and Makin publishes composition and apparent density per product group. Umicore publishes application and packaging, with the technical data sheet on request. We publish composition, mesh and oxygen limits on the constituent grades but no dedicated matrix grade table. Anyone comparing bonds should collect the technical data sheets directly rather than trust a website table, ours included.
Sources
- 1. Umicore (Cobalt & Specialty Materials), Metal Powders for Diamond ToolsRetrieved: 2026-07-30
- 2. Umicore (Cobalt & Specialty Materials), Cobalite® HDR (product page)Retrieved: 2026-07-30 · Composition and technical data sheet are supplied on request, not published.
- 3. Nippon Atomized Metal Powders Corporation, Bronze powder (Product Information)Retrieved: 2026-07-30
- 4. Makin Metal Powders (UK) Ltd, Irregular Copper PowderRetrieved: 2026-07-30
- 5. Makin Metal Powders (UK) Ltd, Product Data Sheet: Zinc Bronze Powder (copy held on this site)Retrieved: 2026-07-30 · Makin-branded product data sheet, published by its Swiss distributor Haeberlin & Co.
- 6. Makin Metal Powders (UK) Ltd, Product Data Sheet: Tin Powder (copy held on this site)Retrieved: 2026-07-30 · Makin-branded product data sheet, published by its Swiss distributor Haeberlin & Co.
- 7. Makin Metal Powders (UK) Ltd, Copper and Copper Alloy Powders (company brochure) (copy held on this site)Retrieved: 2026-07-30