Made at our plant in Huizhou since 2016. We compound black masterbatch for LLDPE / LDPE / HDPE blown film — high dispersion for a clean, stable blow with no streaks or gels on your line.
Film lives or dies on a clean bubble. The masterbatch has to disperse fully and not break the blow — at your let-down, on your machine.
| Carrier resin | LLDPE / LDPE / HDPE (matched to your blend) |
|---|---|
| Carbon black content | 10 – 50% (tuned to opacity / cost target) |
| Standard grades | CM50 · N4066 · N4032 · AM4018 — see the full TDS chart |
| Dispersion | Released on filter-pressure test (ISO 23900-5); the batch CoA states the result with mesh size and test polymer |
| Blow stability | Smooth melt, low plate-out on the die |
| Melt flow (MFR) | Matched to your blown-film line |
| Certifications | ISO 9001 / 14001 / 45001 |
Send your resin blend and film gauge — we match a grade to your line.
High dispersion means no streaks or gels that break the bubble or downgrade the roll.
We set carbon loading to your opacity target so you don't over-pay for black you don't need.
No trading-company layer. A firm factory quote and a faster answer — the margin stays in your cost.
Run a trial lot on your own line before you commit. We keep your spec confidential.
Typical film applications our black masterbatch is compounded for:
High-opacity black for retail and industrial bags.
Weather-stable black for greenhouse and mulch film.
Clean black for industrial and retail packaging.
Durable black for building and ground-cover film.
"Black masterbatch for film" is too broad to specify. The grade that suits a refuse sack is the wrong grade for a 15 µm mulch film, and the difference is not only the carbon black percentage.
| Film type | What the grade has to do | Loading approach | Start here |
|---|---|---|---|
| Garbage & carry bags | Stay opaque at high let-down without turning the film brittle | High, economy loading | Garbage bag grade |
| Stretch & pallet wrap | Low gel count, no die plate-out, keep puncture strength | Moderate — dispersion-critical | CM50 |
| Agricultural & mulch film | Hold opacity and UV life at thin gauge, one season or more | Tuned to gauge and season length | N4066 |
| Packaging & shrink film | Clean surface, low odour; food-contact where the pack needs it | Moderate | AM4018 |
| Construction & weed film | Multi-season outdoor life and tear resistance | Tuned to season length | Quoted to spec |
Film is sold by area, not by weight — so the pressure on a converter is always to blow thinner. That single commercial fact is what makes film the most demanding application for a black masterbatch.
Opacity is set by how much carbon black sits in the light path. As the gauge drops, you have to raise the carbon black concentration in the film to keep the same hiding — which in practice means a lower let-down ratio, so more masterbatch per kilo of resin.
That is where it becomes circular. More carbon black in the film means more particles to disperse, and they have to be dispersed in a thinner, faster-cooling melt. A gel or a speck of undispersed carbon that would pass unnoticed in 30 µm film becomes a tear starter in 15 µm film. So the real constraint is not the percentage printed on the bag — it is the dispersion quality of the grade at your loading.
Two consequences worth putting in your specification:
| Check | Why it decides the outcome |
|---|---|
| Filter pressure value (FPV) | Measured to ISO 18553 or the equivalent screen-pack method. It quantifies undispersed particles — the things that become gels and tears. Ask for the FPV at your intended let-down, not at the supplier's convenient one. |
| Gel count on the finished film | The figure your customer will actually see. Two grades labelled "46% carbon black" can behave completely differently at 4% let-down. |
This is why we tune the grade to a converter's line rather than sell one film grade to everyone. Send us the resin blend, the gauge and the let-down you run, and the dispersion target follows from that.
This is now a commercial issue, not an environmental one. Most packaging sorting lines identify material by near-infrared spectroscopy — and carbon black absorbs across the near-infrared range.
The result: a black film reads to the sorter as "no signal" and is rejected, whatever polymer it is actually made from. A black PE film and a black PET film can look identical to the machine, so both get sent to energy recovery instead of being recycled.
EU packaging rules now set design-for-recycling requirements that tighten towards 2030, and brand owners are already asking converters for sortability evidence. So the question reaches film producers earlier than they expect.
The honest position on our side: conventional carbon black masterbatch is not NIR-visible, and there is no loading trick that makes ordinary carbon black transparent to a near-infrared sorter. What genuinely moves the needle is the film structure and where the black sits in it, plus loading decisions made with the waste stream in mind.
Read the full note on black plastic, NIR sorting and what film producers can do →
We supply high-dispersion grades tuned to your resin blend and let-down. Send your blend and gauge and we'll propose a starting grade to trial on your line.
Yes — we can formulate anywhere in the 10–50% carbon-black range to hit your opacity target, so you pay only for the black you need. Tell us the look you want.
We support trial and small batches, not just full containers. Tell us quantity and we'll quote both a trial lot and a production lot.
Trial lots ship in 5–10 days to most markets, quoted per RFQ, packed with your let-down guidance so your line can run it directly.
Garbage bag film is bought on cost per bag, so it starts from an economy high-loading grade and is tuned to the let-down you run. Tell us the resin blend, the gauge and your target opacity, and we will propose a starting grade — the garbage bag page sets out what we tune.
Yes. AM4018 is our food-contact light-shielding film grade; the grades we test are listed with their report numbers on the SGS test reports page, so you can check the paperwork before you ask for a sample.
Conventional carbon black is not visible to near-infrared sorters, so a black film is normally rejected regardless of the polymer — that is a property of carbon black, not of our grade. It has to be designed around, mainly through film structure. The note on NIR sorting explains the options honestly.
Every grade below is compounded in the same plant, with a full TDS and batch CoA per lot. Click through for the technical data.
Stretch film & heavy gauge
View grade & TDS → 46% ±2 CB · PEN4066Thin mulch film (<15 μm)
View grade & TDS → 40% ±2 CB · PE + CaCO₃AM4018Light-shielding packaging film
View grade & TDS →Not sure which one fits? Compare all grades in one chart →
Tell us your resin blend, film gauge and quantity. We reply with a firm factory quote — and, if you want to test before committing, a free 1–5 kg sample compounded on your own carrier resin. No obligation.
Blown-film buyers qualify on gels and filter pressure. This is where that is controlled, and where each lot is released.
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.