Ordering Custom Grain Size Diamond Micron Powder

Standard grain sizes W5, W10, W20 are always in stock and shipped within 48 hours. But what if your production requires a non-standard grain size — for example W7, W14 or a blend of several fractions? In this article we explain how custom batch ordering works, what the lead times and minimum quantities are, and how we guarantee compliance with your requirements.

Minimum order for custom batch

Minimum order for non-standard grain size is 1 kg (5000 carats). This volume is sufficient for equipment setup and full quality control cycle. For standard grain sizes, the same MOQ of 1 kg applies, but they are available from stock without production waiting time.

Production time: 3-7 days

After order confirmation and prepayment receipt, we start production. Lead time for non-standard grain size is 3-7 working days depending on complexity: simple fractions (W7, W14) — 3-4 days, multi-fraction blends or special surface treatment — 5-7 days. Throughout the lead time you can request an interim order status report.

Step-by-step ordering process

• Step 1: Send inquiry with grain size, quantity and purity requirements
• Step 2: We confirm feasibility and provide quotation within 24 hours
• Step 3: After terms agreement, you pay 30% prepayment
• Step 4: Production 3-7 days with interim control
• Step 5: Final QC, report sent, balance payment and shipping

Not sure which grain size you need? Start with a trial batch from 1 kg — the minimum order — and validate the fraction on your equipment.

When a Standard Fraction Is Not Enough

The standard W5, W10 and W20 fractions cover most typical grinding and polishing operations. But as a process matures, a buyer often finds these steps do not match their existing equipment or do not deliver the required roughness. Typical situations that call for a custom fraction: switching to larger-diameter substrates where the damaged layer is critical; needing a tight upper-bound D90 tolerance; requiring a blend of two fractions for simultaneous productivity and finish; or producing a special tool where grain shape is critical. In all these cases the standard catalog is no longer optimal, and it is more cost-effective to order one exact specification than to suffer scrap or downtime on powder that does not fit.

Parameters You Can Specify

A custom order is not limited to grain size alone. Below is the list of parameters we typically lock per customer request:

Parameter	What is specified	Why
Fraction	W7, W14, W28, W3.5, etc.	Exactly per process stage
Blend	Ratio of two to three fractions	Balance removal and finish
Particle size range	Narrow D90 tolerance	Scratch protection
Grade	SCMD-AA / SCMD-A / industrial	To operation criticality
Packaging	Jars, bags, label	For warehouse handling

How a Custom Batch Is Controlled

Custom batches follow a tightened control procedure. After classification, each sample is measured on a laser granulometer to confirm the median size and upper bound D90. Magnetic impurities, moisture and grain morphology are checked. If you specified a narrow tolerance, the result is compared to your specification before shipping, and the actual D10, D50 and D90 are recorded on the certificate. Particle-size measurement follows ISO 13320:2020. For especially critical orders, testing at an authoritative Chinese national laboratory can be arranged; such tests are paid separately and add a few days.

FAQ on Custom Orders

How does a custom order differ from a standard one?

A standard order ships from stock in 48 hours at fixed catalog parameters. A custom order starts a production cycle to your specification: classification, blending if needed, and tightened control. The price is usually above stock, but the result reproduces exactly your process.

Can I get a sample of a custom fraction first?

Yes, before a full run we usually make a trial lot that you test on your equipment. This confirms the fraction and grade before committing volume and prevents any gap between expectations and the actual result.What if a custom batch does not fit?

If independent lab results show the actual parameters deviate from the agreed specification, we replace the batch free of charge. If the mismatch stems from your process itself, we jointly adjust the specification and produce the next iteration informed by the trials.

Recommendation: Lock the Specification

Once a custom fraction passes trials, we recommend locking it as a standing specification: fraction, grade, D90 tolerance, raw-material batch and control parameters. This removes repeated negotiations on every order and guarantees that the fifth shipment behaves on your equipment exactly like the first trial. For serial production, reproducibility matters even more than a small difference in price per kilogram.

Standard or Custom: How to Decide

The fork is simple. If your operation fits the catalog steps W5, W10 or W20 and the part is not critical, take stock product — cheaper and faster. But if you have tuned the process and hit a roughness the catalog cannot reach, or you build a special tool where grain shape matters, move to a custom fraction. A middle path: start with stock W5 or W10, first map how the regime relates to roughness, and only then order the exact specification. This way you do not overpay at the start and reach the optimal powder based on your own trial data rather than guesswork.

How does pricing depend on a custom fraction?

A custom fraction costs more than stock because it needs separate classification and tightened control. Price drivers include the availability of the right-grade raw material, blend complexity and order volume. The larger the series, the lower the unit production cost. To estimate, send us the required fraction, volume and grade — we will prepare a transparent quotation separating powder cost, control work and logistics.

What to include with your first inquiry?

To speed up the reply, state in your first message: the workpiece material and its hardness, the operation (grinding, lapping, polishing), the required Ra roughness, the grain size you already use, and the monthly volume. If you have a drawing or a surface photo, attach it. This is enough for us to propose a fraction and grade instead of asking back and forth for days.

Ordering a non-standard fraction is not a complication but a normal tool for tuning a process. The more precisely you describe the material, operation and required roughness, the faster we propose a working specification and verify it on a trial lot. Start with a trial batch from 1 kg, confirm the fraction on your equipment, and move to a serial order — this keeps the path from inquiry to stable production to a matter of days.