MetaDi Supreme polycrystalline suspension
Buehler MetaDi Supreme diamond suspension identity, grades, package codes, polishing claims, and formulation and SDS limits.
Tags: abrasives, diamond, metallography, polishing
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Identity and product boundaries
MetaDi Supreme uses synthetic polycrystalline diamond. The smallest listed package for the 6 µm grade is 40-6632, 8 oz [0.24 L]. Buehler reports higher polycrystalline cutting rates for many materials, with performance depending on the specimen and preparation. MetaDi Ultra is a paste. Buehler, Metallographic polishing abrasives Buehler ordering table
Buehler describes Supreme as water-based and solvent-free, with high diamond concentration and a tight grain-size distribution. Its listed oil-based diamond suspension uses monocrystalline MetaDi. MetaDi Combo is monocrystalline suspension with extender. Buehler diamond suspensions and paste
Sizes and package identity
The following standard Supreme entries reproduce the US page's ordering data. Column headings give listed container volumes and rounded metric equivalents. Empty source cells are shown as "not listed". Buehler ordering table
| Diamond size | 8 oz [0.24 L] | 32 oz [0.95 L] | 1 gal [3.8 L] |
|---|---|---|---|
| 0.05 µm | 40-6627 | Not listed | Not listed |
| 0.25 µm | 40-6629 | Not listed | 40-6629-128 |
| 1 µm | 40-6630 | 40-6630-032 | 40-6630-128 |
| 1 µm Fine | 40-6630F | 40-6630F-032 | 40-6630F-128 |
| 3 µm | 40-6631 | 40-6631-032 | 40-6631-128 |
| 3 µm Fine | 40-6631F | 40-6631F-032 | 40-6631F-128 |
| 6 µm | 40-6632 | 40-6632-032 | 40-6632-128 |
| 9 µm | 40-6633 | 40-6633-032 | 40-6633-128 |
| 15 µm | 40-6634 | 40-6634-032 | 40-6634-128 |
| 30 µm | 40-6635 | 40-6635-032 | 40-6635-128 |
| 45 µm | 40-6636 | Not listed | Not listed |
Dye-free Supreme targets specimens that absorb dye and affect image analysis. The page lists 8 oz packages at 1, 3, 6, and 9 µm, respectively 40-6730, 40-6731, 40-6732, and 40-6733. Buehler dye-free ordering table
"Fine" is a separate listed grade, not a different stated micrometer value. The reviewed sources provide no numerical distribution limits that distinguish the Fine grades. These nominal micrometer designations describe abrasive size, not a maximum particle diameter or achieved surface roughness. Package volume is neither diamond mass nor concentration.
Catalog coverage differs. Buehler's 2018-copyright polishing guide lists 40-6636-128 for 45 µm, absent from the current public table. The 2022 SDS also includes 40-6628, dye-free codes ending in -032, and other package codes absent there. An SDS identifier list establishes document coverage, not current sale availability. Polishing guide, page 14, US SDS, section 1
Morphology and polishing evidence
The polishing guide attributes faster removal and less deformation to polycrystalline diamond's multifaceted shape, compared with monocrystalline particles. Its page 7 graph compares 6 µm MetaDi Supreme and 6 µm MetaDi on titanium, stainless steel, aluminum bronze, Rc-60 steel, Rc-20 steel, and zinc. The vertical axis is micrometers removed per minute. The guide explicitly makes results dependent on material, cloth, and preparation parameters. It does not supply a complete experimental protocol or a universal rate ratio. Buehler polishing guide, page 7
The guide's application examples include Supreme steps for soft aluminum alloys, nickel-based superalloys, titanium alloys, and electronic materials. These are specimen-preparation examples, not proof of compatibility with every alloy, coating, or phase. Polishing guide, page 12
Synthesis. A size designation and comparative removal claim cannot establish a polishing time, stock-removal allowance, or accepted finish. Cloth, loading, prior damage, specimen response, and analysis requirements remain separate inputs. Specimen polishing evidence also does not establish production Finishing process references.
Formulation and SDS versions
| Document | Evidence and scope |
|---|---|
| Historical US SDS 1352983_A, issued 1 March 2017, revised 10 December 2020, revision 3 | Section 3 lists water at 30 to 70 weight-%, propylene glycol at 20 to 60 weight-%, and diamond at 0 to 1 weight-%. Exact concentrations are trade secrets. Section 9 gives pH 6.5 to 8.5. Historical SDS |
| US SDS 1352983, issued and revised 19 July 2022, version 1.0 | Covers named Supreme, monocrystalline, and Combo codes. Section 3 has no ingredients requiring disclosure under its HazCom criteria. Section 8 names 1,2-propanediol and diamond without concentrations. Section 9 gives pH 6.5 to 8.5. 2022 SDS |
The historical percentages are disclosure ranges for the listed mixture family, not a Supreme grade's guaranteed diamond loading. The 2022 omission does not demonstrate that diamond or glycol is absent. The sources do not explain whether disclosure changes reflect reformulation. Neither sheet supplies a complete, grade-specific recipe. Synthesis. The commercial solvent-free description cannot be read as proof of a pure-water carrier or zero organic ingredients.
The SDS index separates entries before 31 October 2022 and after 1 November 2022. These labels differ from the dates printed inside the PDFs and do not themselves date a formulation change. Buehler SDS index
Handling and coverage limits
The 2022 US SDS classifies the mixture as not classified under GHS US. It still specifies ventilation, protective gloves, safety glasses, suitable clothing, and cool, ventilated storage. Section 10 identifies strong acids, strong bases, and strong oxidizing agents as incompatible. These are handling statements, not universal specimen compatibility or evidence of process performance. 2022 US SDS, sections 2, 7, 8, and 10
Source review occurred on 29 October 2026 PDT. The US product page is undated. The guide carries a 2018 copyright despite its filename's 0216 suffix. No regional formulation equivalence, lot certification, shelf life, guaranteed roughness, or customer-approved settings are established here. A shop product URL redirected to login during review, so authenticated specifications, prices, and stock status are outside this reference.