INKBANK Group Inc. — digital inkjet ink manufacturer since 2004. 40,000-ton annual capacity · 50+ patents · 100+ countries. Certified: OEKO-TEX ECO PASSPORT | ZDHC Level 3 | GOTS 7.0 | ISO 9001.
Most B2B buyers sign sublimation ink contracts based on a single number: price per liter. Six months later, they are replacing printheads, reworking rejected batches, and wondering why the "cheap" ink cost them $20,000 more than the quote promised.
This is not a buying guide. It is a testing protocol — a step-by-step procedure you can run over 7 days on your own equipment, with your own substrates. It will tell you, with numbers not opinions, whether a sample ink deserves your purchase order. It works for any supplier, including us.
Before testing any sublimation ink sample, always request three documents: a laser-diffraction particle size distribution curve (D50 <150 nm, D90 < 350 nm), a viscosity-temperature curve (20–40°C), and certification PDFs with verifiable numbers. Missing any one means the supplier lacks industrial-grade quality control.
Before the ink ships, ask the supplier for these three documents. If any one of them is missing, do not waste 7 days testing — the supplier does not have industrial-grade quality control.
| # | Document | What It Proves |
|---|---|---|
| 1 | Particle Size Distribution Curve (laser diffraction, Malvern or eq.) | D50 and D90 values. Without this, you cannot predict clogging behavior. |
| 2 | Viscosity-Temperature Curve (20–40°C range) | Ink behavior as your workshop temperature changes through the day. |
| 3 | Certification PDFs with verifiable certificate numbers | Not a logo on a website. The actual certificate. OEKO-TEX and ZDHC both have public verification databases. |
The particle size report is the most important of the three. What matters is not just the D50 (median) — ask for the D90, the 90th percentile particle size. Sublimation ink with a D90 above 350 nm will cause printhead clogging in industrial Epson and Kyocera systems regardless of price point. Acceptable thresholds: D50 < 200 nm and D90 < 350 nm.
Sublimation ink is formulated for specific printheads, not for printer brands. The same ink that runs perfectly through an Epson I3200 can clog an Epson DX5 within hours. Always verify viscosity and surface tension match your specific printhead's specification window before running any further tests.
| Printhead | Target Viscosity (30°C) | Surface Tension | Common Use |
|---|---|---|---|
| Epson I3200 / I1600 | 3.0–5.0 mPa·s | 24–28 mN/m | Industrial roll-to-roll, high-speed |
| Epson DX5 / DX7 | 3.0–5.0 mPa·s | 24–28 mN/m | Mimaki, Roland, Mutoh |
| Kyocera KJ4B | 5.0–7.0 mPa·s | 28–32 mN/m | Single-pass high-speed textile |
| Ricoh GEN5 / GEN6 | 7.0–10.0 mPa·s | 26–30 mN/m | EFI, Durst, MS, flatbeds |
⚠️ Day 1 Action: Confirm compatibility. Print a full nozzle check at the start of the day. Record the exact number of missing nozzles — this is your baseline for the Day 4–5 idle test. Also confirm substrate compatibility: sublimation ink only bonds to polyester (≥70%) and polymer-coated hard surfaces.
Also confirm substrate compatibility: sublimation ink only bonds permanently to polyester (≥70%) and polymer-coated hard surfaces. For cotton fabrics or dark substrates, sublimation ink will not perform — you need Pigment ink instead. See our DTF vs Sublimation comparison guide for a full breakdown.
To establish a sublimation ink print quality baseline, print a standardized test image on the same printer with the same transfer paper and settings as your control ink. The test must include a pure black block, CMYK gradients from 0–100%, skin tones, fine text at 4–8pt, and a color chart with known Lab reference values. Measure gamut volume with a spectrophotometer after transfer — a 5% gamut difference is visible to the naked eye; a 10% difference affects Pantone matching.
● Print the following test image with your current ink (control) and the sample sublimation ink side by side. Use the same printer, same transfer paper, same settings. Transfer both prints to your standard substrate, then measure.
Pure black block (100K): The fastest quality check. Low-quality black sublimation ink turns green, brown, or grey after transfer. This is a dye purity defect with no ICC profile fix.
● CMYK gradients 0%→100%: Reveals banding, tone jumps, and transfer unevenness.
● Skin tones: The hardest colors for sublimation. Poor formulations produce orange or washed-out skin.
● Fine text at 4pt, 6pt, 8pt: Edge sharpness test. Ghosting or bleeding shows here first.
● Color chart: For spectrophotometer measurement and gamut volume comparison.
Measure the color chart with a spectrophotometer after transfer. The sublimation ink with the larger gamut volume gives you more printable colors. A 5% gamut difference is visible to the naked eye. A 10% difference determines whether you can hit a brand's Pantone requirement.
Sublimation ink transfer efficiency is the percentage of ink that moves from transfer paper to substrate during heat pressing. It is measured by weighing transfer paper before and after pressing. Reject any sublimation ink with transfer efficiency below 88%. Industrial-grade sublimation inks achieve 93–96%, and premium formulations reach 96%+.
Transfer efficiency is the percentage of sublimation ink that moves from the transfer paper to the substrate. Low efficiency means you are paying for ink that evaporates or stays on the paper — and your colors will be visibly duller.
How to measure transfer efficiency:
1. Weigh the printed transfer paper before pressing (subtract the weight of an unprinted sheet to isolate ink weight).
2. Press at your standard time, temperature, and pressure.
3. Weigh the paper after pressing. Weight lost ÷ ink weight applied = transfer efficiency.
| Transfer Efficiency | Verdict | What It Means for Your Production |
|---|---|---|
| Below 88% | 🔴 Reject | Throwing away 12%+ of every liter. Colors will be visibly dull. |
| 88–92% | 🟡 Acceptable | Industry average. Works for non-critical applications. |
| 93–96% | 🟢 Good | Less ink consumed per print. Better color saturation. |
| 96%+ | 🟢 Premium | Maximum color density. Minimum waste. Flag this on evaluation. |
To test sublimation ink for clog resistance, print a nozzle check, leave the printer idle for exactly 48 hours, then print another nozzle check. More than 6 missing nozzles after the idle period means the sublimation ink is not suitable for industrial production — it will cause chronic clogging after every weekend shutdown.
This is the test that separates industrial-grade sublimation ink from hobbyist formulations. Print a nozzle check at 9 AM on Day 4. Do not print anything for 48 hours. Print another nozzle check at 9 AM on Day 6.
Count how many nozzles are missing compared to your Day 1 baseline:
This separates industrial-grade sublimation ink from hobbyist formulations. Print a nozzle check at 9 AM on Day 4. Do not print anything for 48 hours. Print another check at 9 AM on Day 6.
| Missing Nozzles After 48h Idle | Verdict |
|---|---|
| 0–2 | 🟢 Excellent. Industrial-grade anti-sedimentation stability. |
| 3–5 | 🟡 Borderline. May be acceptable with daily cleaning cycles. |
| 6+ | 🔴 Reject. Will cause chronic clogging, especially after weekends. |
Why 48 hours? It simulates a standard weekend shutdown. If the sublimation ink cannot survive a 48-hour idle without significant clogging, your Monday mornings will be spent cleaning printheads instead of printing. An Epson I3200 industrial printhead replacement costs $2,000–$3,000. Sublimation ink that saves $4 per liter can cost you a printhead every quarter.
To test sublimation ink batch consistency, print the same test image from two samples sourced from different production batches, then measure the color difference (ΔE) with a spectrophotometer. If ΔE exceeds 2.0, the supplier's quality control is insufficient for industrial supply — production colors will drift visibly over time and buyers will detect it before you do.
A single sample tells you nothing about what happens on your 10th order. You need to test two samples from different production batches.
Print the same test image from Day 2 with Sample A and Sample B — same printer, same paper, same settings. Measure both with a spectrophotometer. If the ΔE (color difference) between the two batches is greater than 2.0, the supplier's batch consistency is poor. Your production runs will drift in color over time, and your buyers will notice before you do.
This is the most commonly skipped test — and the most common cause of long-term supply chain failure. A supplier that passes Day 1–5 but fails Day 6 is not ready for industrial supply. Walk away.
Sublimation ink wash fastness is tested by washing a printed substrate 5 cycles per ISO 105-C06 or AATCC TM61-2013e(2020)e2, then comparing the washed print to an unwashed control using a spectrophotometer. The minimum acceptable wash fastness grade for most apparel buyers is 4–5. Sublimation ink that does not hold grade 4 or higher should be rejected for apparel applications.
Print your standard production design on your actual substrate. Wash it 5 cycles per ISO 105-C06 or AATCC TM61-2013e(2020)e2. Compare the washed print to an unwashed control with a spectrophotometer.
The standard requirement for most apparel is a minimum wash fastness grade of 4–5. If the sublimation ink sample cannot hold grade 4 after 5 washes and your buyer's spec requires 4–5, you have hard data to reject it — no subjective judgment needed.
For a mid-size printer running 800,000 linear meters/year, cheap ink at $8/L has a true annual cost of ~$42,700 — compared to $34,700 for premium ink at $12/L — once printhead replacements, downtime, and rework are factored in. The $4/L saving is absorbed three times over in maintenance costs.
While your 7-day test is running, calculate the total annual cost of this ink — not the price per liter.
| Cost Factor | Budget Ink — $8/L | Premium Ink — $12/L |
|---|---|---|
| Ink cost (800k meters/year) | $25,600 | $30,000 |
| Cleaning fluid + wasted purges | $2,400 | $800 |
| Printhead replacements | $4,500 | $1,500 |
| Production downtime | $6,000 | $1,800 |
| Rework from color inconsistency | $4,200 | $600 |
| True annual cost | $42,700 | $34,700 |
Day 0: Supplier cannot provide particle size, viscosity, or certification documents.
Day 1: More than 10 nozzles missing on your baseline nozzle check (incompatible with printhead).
Day 2: Black ink turns green or brown after transfer (dye purity problem).
Day 5: More than 6 nozzles missing after 48-hour idle.
Day 6: ΔE > 2.0 between two batch samples.
| Test | Day | Pass Threshold | Reject If |
|---|---|---|---|
| Particle size D90 | 0 | < 350 nm | ≥ 350 nm or none |
| Viscosity match | 1 | Within spec window | Outside spec; >10 missing |
| Black color transfer | 2 | Neutral black | Green, brown, grey cast |
| Gamut volume | 2 | ≥ control ink | >10% below control |
| Transfer efficiency | 3 | ≥ 93% | < 88% |
| 48h idle clog test | 4-5 | 0–2 missing nozzles | ≥ 6 missing nozzles |
| Batch ΔE consistency | 6 | ΔE ≤ 2.0 | ΔE > 2.0 |
| Wash fastness | 7 | Grade 4–5 | Below grade 4 |
Run a pilot order of 50–100 liters before signing a long-term contract. One week of real production will surface issues no lab protocol can. If the ink passes the 7-day protocol and the pilot run, you have found a supplier worth contracting with.
INKBANK supplies free sample kits with full documentation — particle size distribution curve, viscosity chart, verifiable certification PDFs, and ICC profiles — so you can run this exact protocol. If we pass, you order. If we don't, you don't. That is how industrial buying should work.
Sublimation ink for Epson I3200 and I1600 printheads should have a viscosity of 3.0–5.0 mPa·s at 30°C and a surface tension of 24–28 mN/m.
For industrial ink, the D50 (median) should be below 150 nm and the D90 (90th percentile) below 350 nm. D90 above 350 nm will cause clogging.
No. Sublimation ink requires at least 70% polyester content to bond permanently. For cotton, Pigment Printing or DTF is the correct technology.
Weekend clogging is typically caused by poor anti-sedimentation stability. Dye particles aggregate during idle periods. The 48-hour idle test is designed to identify this before purchase.
We supply free sample kits with full documentation (D90 particle size, viscosity curves, verifiable OEKO-TEX/ZDHC certs).
Contact Us
Hello, welcome to submit any questions and suggestions. We will reply to you as soon as possible. Thank you for your support and help.
