Wet-grinding result / Acceptance guide
A statement such as “D90 below the target” is incomplete. Name the distribution weighting, measurement method, sampling point, sample preparation, dispersion state, instrument and analysis model before comparing a wet-grinding trial with a purchase requirement.
Keep three boundaries visible
D10, D50 and D90 are positions on a cumulative distribution. They are not standalone material identities, direct counts of particles or universal wet-grinding endpoints.
Use Dv(10), Dv(50) and Dv(90) for a volume-weighted result; use the method’s correct notation for number, intensity, mass or another basis. Do not compare differently weighted percentiles as if they were the same quantity.
Name the measurement principle and edition, instrument and accessory, analysis model and required optical inputs. ISO 13320 laser diffraction reports a model-based, equivalent-sphere volumetric distribution and does not define material-specific acceptance requirements.
Dilution, dispersant, additives, stirring, ultrasound and hold time can change agglomeration or damage the sample. Dv(90) still leaves a coarse fraction above that percentile, so a critical oversize condition needs its own threshold, method and disposition rule.
Acceptance-writing route
The route below turns a reported distribution into a result that a buyer, laboratory and equipment supplier can review without inventing a particle-size promise.
Record product identity, formulation and lot, process stage, sampling location and time, sample quantity, homogenization or splitting, temperature and hold history.
State whether the method should preserve process-state agglomerates or disperse them under an agreed preparation. Record the dispersant, additives, dilution, stirring, ultrasound and timing without assuming that more dispersion energy is always better.
Record the method and edition, instrument and dispersion accessory, analysis model and optical inputs, concentration or obscuration, measurement duration, replicate plan and report settings.
State each percentile with its weighting and unit, the agreed limit or range, summary and retest rule, plus a separate oversize or coarse-tail criterion when that risk matters.
Particle-size acceptance checklist
Do not insert a generic particle target. Complete the fields below with the buyer, responsible laboratory and equipment supplier before using a result for trial or purchase acceptance.
Open the process briefProduct, formula and lot; wet-grinding stage; sampling point and time; sample quantity; mixing or splitting; temperature and hold history.
The process-state particle, droplet or agglomerate condition the result is meant to represent, including any condition the preparation must preserve.
Dv(10), Dv(50), Dv(90), Dn(percentile) or other correct notation; cumulative undersize convention; value, unit and report basis.
Measurement principle, current method and edition, laboratory, instrument model, dispersion accessory or cell, software and report revision.
Dispersant, additives, dilution, wetting, stirring, ultrasound method, power and duration, elapsed time, stability check and any observed breakage or re-agglomeration.
Optical model, refractive and absorption inputs where applicable, background, concentration or obscuration, measurement duration and any result-processing rule.
Independent sampling or preparations, repeat measurements, raw distribution retained, summary statistic, variability rule, outlier handling and uncertainty or precision statement.
Separate coarse-tail threshold and method where required, acceptance owner, retest and disposition rule, plus the other product and operating conditions that must also pass.
Draft source record / Pending technical review
These sources support the measurement and reporting boundaries below. They do not supply a target, preparation recipe or wet-grinding outcome for this site.
Buyer decision FAQ
They are cumulative percentiles of a volume-weighted size distribution: the reported size is the point below which the stated proportion of sample volume lies. Dv(50) is the volume median. Always retain the method, unit and full distribution with the percentile summary.
No. Number and volume weight different parts of a population and can produce different percentile values for the same material. Record the weighting explicitly and compare only results produced on an agreed, method-consistent basis.
No. Dv(90) marks the size below which ninety percent of the cumulative sample volume lies; it is not the maximum. If rare coarse material matters, define a separate threshold, sampling plan, suitable method and acceptance or disposition rule.
Yes. Preparation may improve wetting and separate agglomerates, but it can also promote re-agglomeration, alter droplets or damage particles. Freeze a technically reviewed preparation that represents the intended product state, and record every controlled condition with the result.