Made at our plant in Huizhou since 2016. Conductive grades are specified by resistivity, not by colour. Send us the surface resistivity band your ESD standard requires and the base polymer: we confirm at quotation whether we can compound to it and what measured data we can put behind the lot, rather than publishing a figure we have not measured.
The whole point of a conductive grade is a number: the surface resistivity your ESD process needs. Carbon type, loading and dispersion all move that number, so they are set together — and whether we can hold the band you need is confirmed at quotation, with the test method named.
| Carrier resin | PE / PP / PS / ABS — matched to your process |
|---|---|
| Conductive carbon | Specialty conductive carbon black, not standard pigment black — availability for your band confirmed at quotation |
| Target resistivity | The band from your drawing or control plan; we tell you plainly whether we can compound to it before you order |
| Dispersion control | Released every lot as a simulated-process dispersion rating; resistivity is a separate measurement, not part of that release set |
| Batch testing | The ten checks every lot is released on. Resistivity is measured and reported only where it has been confirmed and agreed in writing with the order |
| Certifications | ISO 9001 / 14001 / 45001 |
Send the resistivity band you must hit and the base polymer. We confirm whether we can compound to it and what data we can issue, before you commit to a trial lot.
Send the resistivity band on your drawing with its units, the standard and edition behind it, and the base polymer. We tell you plainly whether we can compound to it and what we can measure — rather than selling a generic "conductive" grade off a chart.
Carbon loading and dispersion are held lot to lot through the release checks. Resistivity repeatability is a measurement question — ask for the data you need and we will say whether we can produce it.
No trading-company layer. A firm factory quote — once supply is confirmed — and a technical answer from the compounder.
Where we have confirmed we can supply a grade for your band, the way to check it is a trial quantity measured on your own parts, on your own equipment, before any contract is written.
Typical ESD applications buyers ask us about:
Electronics handling trays and carrier tape.
Antistatic bags and film for components.
Conductive covers, housings and safety parts.
Conductive sheet and profiles for controlled areas.
A conductive grade is bought against a number, and the number is wherever your part has to land.
Everything else about the product — how black it looks, how it runs, what it costs per kilo — sits behind one measurement: surface resistivity. A part that reads 107 Ω/sq when the drawing says 104 is not "nearly there". It fails the ESD audit, and no adjustment at the machine during a production run will pull it back. That is why we ask for the resistivity band before we quote a grade, and why the figure has to come from a measurement on your part on agreed equipment — what data can travel with the lot is confirmed and written into the order, not assumed from a chart.
The practical consequence: do not compare conductive masterbatches by carbon black percentage. Two grades both labelled "40% conductive carbon" can sit three orders of magnitude apart, because what sets the number is how the carbon network is built, not how much carbon went over the weighbridge. A supplier who quotes only a percentage has not given you enough to specify from.
Three things move resistivity, and they are set together, not one at a time: the conductive carbon itself, the loading, and the dispersion. Change one and the other two usually have to move with it. That is the whole of the compounding job on a conductive grade.
A terminology and test-requirement check list rather than a band chart. Send the drawing, units, named standard and test conditions so we can assess whether supply and suitable evidence can be confirmed.
| What has to be pinned down | Why it changes the quote | What to send us |
|---|---|---|
| Resistance or resistivity, and the units | They are not the same quantity. ESDA classifies materials by resistance in ohms: conductive below 104 Ω, static dissipative from 104 to below 1011 Ω, insulative at 1011 Ω and above (ESDA Fundamentals, Part 1). Surface resistivity in Ω/sq is measured by a different method and is not interchangeable with those resistance categories. | The figure from your drawing with its units — Ω or Ω/sq — and which of the two your control plan actually tests. |
| Low charging is a separate property | ESDA Part 3 treats low charging, conductive/dissipative resistance and discharge shielding as distinct packaging properties: a material can satisfy one and not another. "Antistatic" on its own does not say which one you are buying, so we will not map it to a number for you. | Whether you need low-charging behaviour, a resistance limit, shielding, or more than one. |
| Standard, edition and clause | The limit only exists inside a specific document. ESDA lists ANSI/ESD S541 (2026 edition) as technically equivalent to IEC 61340-5-3 (ESDA store listing); a bare "IEC 61340" reference names no edition or clause, so there is nothing we can check a figure against. | Standard number, edition, and the clause that carries your limit. |
| Test method and conditioning | Electrode type, applied voltage, conditioning time and humidity all move the reading. Two competent labs can disagree without either being wrong. | The method and conditioning you test to, and whether you measure in-house or send parts out. |
| What gets measured: the part, not the pellet | Resistivity is read on a finished part, so your process sits inside the number — geometry, gate and weld lines included. | Part type, geometry, and where on the part the reading is taken. |
| Migratory antistatic systems | Some antistatic packages work by additive migration, so a wiped, washed or aged surface reads differently from a fresh one. | Whether your ESD plan includes wipe testing or readings after ageing. |
We do not publish a band chart of our own, and we do not quote a number we have not measured. Send the figure from your drawing together with the items above and we confirm at quotation whether we can compound and measure to it. The definitions quoted here come from ESDA Fundamentals Part 1 (resistance categories) and Part 3 (low charging, resistance and shielding as separate properties).
The counter-intuitive part of conductive compounding, and the reason two "identical" grades behave differently.
Carbon black only conducts when the particles form a connected network through the polymer. Undispersed agglomerates are clumps of carbon that are electrically isolated from that network — they contribute weight and cost, and nothing to conductivity. On a resistance reading they show up as a part that reads higher than the loading predicts, and reads erratically from one point to the next on the same surface.
When a part reads too resistive, the instinct is to add more carbon. Beyond a certain point the network is already percolated and further loading buys very little conductivity — but it does buy a rougher surface, worse mechanicals, and more die build-up on the line. The better lever is dispersion: build the network you already paid for, rather than buying carbon that clumps.
Resistivity is measured on a finished part, not on the masterbatch, so the reading carries your process inside it: screw configuration and shear history, melt temperature, injection speed, cooling rate, and part geometry all shift the network. Two plants running the same qualified grade can read half an order of magnitude apart and both be within the supplier's lot data. This is exactly why the number has to be measured on your parts before a contract is written — and why a trial lot, agreed at quotation, is the only place that reading exists.
The four we are asked about most, and what actually causes them.
Almost always a dispersion or carbon-network question rather than a loading error — the weighed-in percentage can be identical while the network is not. The defence is to judge every reorder against a measured figure from your own part: ask at enquiry what data will travel with the lot and have it written into the order.
Some antistatic systems rely on additives that migrate to the surface, and a wiped or washed surface reads differently from a fresh one. If your ESD plan includes surface-wipe testing, say so at enquiry stage — it rules out systems that only meet the number on day one.
Regrind dilutes the conductive network and can carry contamination from other materials. If regrind is part of your process, tell us the ratio at enquiry — whether the target still holds at that regrind level is a trial question, and we will say plainly if it sits outside what we can hold.
Point-to-point scatter usually points to agglomerates or to flow lines where the network is stretched thin — thick sections, weld lines and gate areas read worst. It is a dispersion and gating conversation, and both are worth having before a tool is cut.
Send us the band and the base polymer. We check it against what we can compound and measure, and we tell you plainly whether we can quote it — including whether measured resistivity data can travel with the lot. We do not quote a band we have not measured.
No. Conductive grades use specialty conductive carbon black, which costs more per kilo and behaves differently in dispersion — standard pigment black will not reach ESD resistivity levels. Whether we can supply a grade for your band is confirmed at quotation. See our note comparing antistatic and conductive grades →
Only after we have confirmed at quotation that we can supply a grade for your band and what measured data can travel with it. Where that is confirmed, the trial quantity is agreed in the quotation for your grade and specification — large enough to mould or extrude parts and measure on your own equipment. The trial quantity, the data set and the price step to contract volumes are written into the quotation.
Both are confirmed at quotation, because they depend on whether we can make the grade your band needs. Where we can, sampling and lead time are quoted with the order — 10–15 days from specification confirmation is the figure we work to for grades we have confirmed. Ask for the sample and the data set at enquiry so they are written in rather than assumed.
Tell us the resistivity band you have to hit, the standard behind it and the base polymer. We reply with what we can actually confirm: whether we can supply a grade for that band, what measured data can travel with the lot, and the lead time. Samples and trial quantities are agreed in the quotation once supply is confirmed.
This is the compounding, pelletising and QC route behind the black masterbatch grades we publish. It is a general black masterbatch plant, not a conductive line — whether we can supply a grade for your resistivity band is confirmed at quotation, so please do not read the video as evidence of one.
Full factory tour —2:50 on YouTube
Two minutes and fifty seconds inside the Huizhou plant: raw-material dosing, compounding, pelletising, packing and the QC laboratory.
Watch the full tour on YouTube →
Factory-direct. Annual capacity 60,000 t/yr. Certification details on the certifications page.