TECHNICAL GUIDE / 2026-10-02
Short answer. An F number identifies an abrasive grain grade used for bonded abrasives and related applications. Confirm the relevant FEPA standard, its edition and the required particle size distribution before comparing suppliers.
What the F designation tells you
FEPA publishes separate grain standards for bonded and coated abrasive products. Its public standard descriptions identify the bonded abrasive series as F grit. The CHAOYAN product catalog lists F8–F320 models, each with an individual English product page and data sheet.
The F number is a grade identifier, not a promise that every particle has one diameter. FEPA explains that macrogrit mean diameters are specified as ranges and that macrogrit distribution is determined by sieving. A commercial acceptance document must say which distribution limits and sampling method apply.
| Question | Where to check | Why it matters |
|---|---|---|
| Which F grade? | Product page and order | Sets the nominal grade |
| Which standard? | Purchase specification | Fixes the test basis |
| Which chemistry? | PDS and agreed sheet | Defines material limits |
| Which batch? | Batch test report | Checks delivered material |
Reading CHAOYAN's F series
The catalog contains individual records for F24, F36, F60 and other listed F models. Some chemical ranges are grouped by model band in the published specification; magnetic content is model specific where published. The pages present those published values and leave unpublished numbers blank rather than borrowing a neighboring grade's data.
For blasting, ask about the workpiece, pressure, nozzle, dry or wet process and reuse. For a wheel, state the wheel type, bond, work material and current grain. These operating facts determine which candidate grade deserves a trial.
Selection guidance
Choose a candidate F grade from the process and existing specification. Then compare supplier documents line by line: series, grade, chemistry, distribution, test method and batch acceptance. Request a sample when changing suppliers.
Common mistakes
- Copying micron values from an unattributed online table into a purchase order.
- Assuming an F designation alone guarantees wheel or blasting performance.
Frequently asked questions
Does FEPA publish one exact particle diameter for every F grade?
Its public explanation describes macrogrit mean diameters as ranges, with distribution controlled by the applicable standard.
Can I order F grit without naming a standard?
You can inquire by grade, but the agreed specification should state the required grading and test basis before supply.
