What a grade band does
A grade band groups powder into a broad working range. It gives the buyer and supply desk a practical starting point before an exact manufacturer designation is selected. It does not state a particle-size distribution or replace the producer’s grading system.
The useful question is not simply “fine or coarse?” It is “what must this process step remove, and what surface must it leave for the next step?”
How the bands frame the discussion
| Working band | Process discussion it opens | Information that matters next |
|---|---|---|
| Submicron | Final finishing discussions where surface condition is the primary constraint. | Substrate, target finish and measurement method, current polishing step, dispersion route and acceptable surface damage. |
| Fine | Precision finishing and polishing where removal and surface condition must be balanced. | Incoming surface, required finish, process time window, suspension chemistry and the following operation. |
| Medium | Intermediate lapping or removal before a finer finishing stage. | Starting condition, material to be removed, required outgoing surface and the next grade or process. |
| Coarse | Heavier removal or lapping support before finer stages. | Workpiece material, removal objective, allowable damage, machine or lap and downstream finishing route. |
These are qualitative selection categories, not performance claims. The same band can behave differently when the substrate, concentration in the buyer’s suspension, lap, pressure, speed or cleaning route changes. No process parameter should be inferred from the band label.
Why the finest band is not automatically the right band
A finishing grade cannot compensate for an unsuitable incoming surface or an earlier step that leaves damage. Choosing a finer powder may also miss the removal objective of an intermediate operation. Review the full sequence before selecting the final step.
Likewise, a coarser band is not a universal route to faster production. Removal, surface damage and downstream correction must be assessed together on the buyer’s process.
Which datasheet fields close the specification
Ask for the exact grade designation and the partner factory’s current datasheet. Review the stated particle-size characterisation method rather than comparing a single label across different supply routes. Where chemistry, purity or surface condition matters to your process, request the relevant documented fields instead of relying on a generic “diamond powder” description.
A sample can help test the selected powder in your own suspension and inspection routine. Keep the sample identity, datasheet and process record linked so that an accepted configuration can be written into the order.
What to confirm before ordering
- Exact grade designation and the partner factory’s current datasheet revision.
- Particle-size characterisation method and any available batch-specific information.
- Chemistry, purity or surface-condition fields required by the process.
- Compatibility with the buyer’s dispersion, application and cleaning route.
- Accepted sample configuration and the inspection result used to approve it.
- Packaging, labelling, batch documentation and dispatch arrangements confirmed at quotation.
Sources and notes
The bands in this article are explanatory categories drawn from general abrasive-selection practice. They are not a published Xintai stock range and contain no numeric size limits. Exact designations and measured values must come from the selected partner factory’s current documentation.
Last reviewed: 2026-11-06