TECHNICAL GUIDE / 2026-10-02
Short answer. There is no process independent 'best' grit size. Define the surface target, substrate and equipment, select an F grit candidate from the specification, and verify the result in a controlled trial.
What changes the selection
The official CHAOYAN product material names particle shape, pressure, nozzle, dry or wet blasting and reuse as factors in abrasive selection. The target may be removal of rust, preparation for a coating or another surface condition; these objectives should not be treated as identical.
A nominal F designation does not tell the whole story because the particle size distribution and shape must meet the agreed sheet. Equipment settings can change impact energy and working particle mix. If the material is recycled, document how long it is used before the result is assessed.
| Variable | Record for each trial | Avoid |
|---|---|---|
| Grade | Full F designation and lot | Bare number |
| Machine | Pressure, nozzle, method | Unrecorded settings |
| Surface | Substrate and starting condition | Different test panels |
| Outcome | Agreed acceptance measure | Visual guess alone |
How to compare candidate grades
Pick candidate grades from the customer's current process and product documents. Use the same substrate, preparation target and machine settings for each run. Record the sample lot, abrasive mass, run time and resulting surface condition when those measures are relevant to the buying decision.
If the results differ, do not attribute the difference solely to grade without checking distribution, particle shape and process variation. The next step is a revised specification or a repeat trial, not an unsupported performance claim.
Selection guidance
Send the current abrasive, candidate F grades, equipment settings, target result and annual or trial quantity to CHAOYAN. Ask for the PDS of each candidate and agree the acceptance criteria before purchase.
Common mistakes
- Applying a grit recommendation from another substrate or machine without a trial.
- Using the word 'best' without defining cleaning result, profile, consumption and cost criteria.
Frequently asked questions
Is F36 always the best grade for rust removal?
No. Rust condition, substrate, equipment and acceptance criteria determine the useful candidate and require a trial.
Should I compare F and P grit for blasting?
Start with the F grit blasting product route; P grit is the coated abrasive series.
