A high-concentration, unfilled film grade for blown film lines that need full blackout without mineral filler. 47% carbon black on a clean PE carrier, ash below 1%, so nothing migrates and nothing scratches your die.
Typical values from in-house QC. We confirm the contractual spec against your order, with a batch CoA on every shipment.
| Property | Typical value |
|---|---|
| Carbon black content | 47% ±2 |
| Carrier system | PE (unfilled) |
| Ash content | <1% (unfilled) |
| Melt flow rate (190 °C) | >10 g/10 min (10 kg) |
| Moisture | <0.50% |
| Recommended let-down | 1–3% |
| Density | <2.0 g/cm³ |
| FOB price range | USD 2.10–4.50 / kg (FOB) |
| Minimum order | 500 kg (samples free) |
| Delivery | 10–14 days after spec confirmation |
| Packaging | 25 kg KP or PE bags, 20 bags per pallet |
| Loading port | Shenzhen, China |
| HS code | 32064900 |
| Quality standards | ISO 9001 / 14001 / 45001 plant · batch CoA per lot |
Values are typical QC reference data, not contractual specifications — request the full TDS and we send it the same day.
Where CM50 shows up in our export business, and why buyers pick it.
Full opacity with less masterbatch per ton of film — 47% concentration means 15–25 kg per finished ton at typical let-down.
Unfilled carrier keeps the weathering package clean; pairs with your UV system instead of fighting it.
Ash below 1% means no mineral leachables; food-contact statements available on request.
Runs as the black layer in 3-layer structures without die-buildup issues from filler.
The formulation logic behind the spec sheet — what the chart does not say.
Why 47% and not more: above roughly 50% loading on PE, dispersion quality starts to trade against concentration. CM50 sits at the point where you still get a fully dispersed, sieve-clean compound while cutting let-down to 1–3%. At full opacity that is roughly half the masterbatch volume of a standard 25% grade.
Why unfilled: filler is a cost tool, not a quality tool. On film that goes through narrow die gaps, CaCO₃ raises gel count and abrasion. CM50 keeps ash below 1% so the gauge stays clean and die life stays long.
The 10 kg MFR condition (not the usual 21.6 kg) reflects how this grade flows in LLDPE film lines — matched so the black layer and the host resin move as one melt.
Three film grades, three different jobs. CM50 is the one built for full blackout without filler.
| Grade | Carbon black | Carrier system | Let-down | FOB price | Best for |
|---|---|---|---|---|---|
| CM50 | 47% ±2 | PE (unfilled) | 1–3% | USD 2.10–4.50 | Blown film needing full blackout with no mineral in the system |
| N4066 | 46% ±2 | PE (unfilled) | 1–1.5% | USD 2.00–4.20 | Thin mulch film below 15 µm, protective bags, co-ex black layers |
| 508C | 13% ±2 | PE + CaCO₃ (~56%) | 3–6% | USD 1.20–2.80 | Cost-driven extruded parts where UV is not the driver |
An unfilled 47% grade is a dispersion product, and dispersion problems show up visually on film before they show up anywhere else.
High-load unfilled grades put more carbon black per kilogram through the same screen area. On a fine pack, pressure climbs across a run and the operator ends up blaming the masterbatch. Open the pack, or accept a shorter screen change interval — the arithmetic is in the dosing, not in the grade.
Streaks on blown film from a 47% grade are usually incomplete dispersion, and incomplete dispersion is usually a screw or temperature problem rather than a raw-material problem. Check barrel profile and mixing elements before you reject the lot; we can supply filtration-pressure data so you can separate the two causes.
CM50 is supplied below the stated moisture ceiling in sealed 25 kg bags. Re-drying is not required and, done badly, can fuse pellets in the hopper. If storage has been poor, dry per the TDS rather than by habit.
It is compounded on clean, unfilled PE with food-contact statements available on request. For formal compliance documents against your market (EU 10/2011, FDA), tell us your target and we issue the statement with the quote.
Start at 2% for full blackout in natural LLDPE, then walk down. Most lines settle between 1% and 3% depending on gauge and opacity target.
Yes — it is a general blown-film grade, not restricted to co-ex. On mono-layer lines it doubles as the UV-carrier layer for silage and geomembrane when paired with your UV package.
Use the form below or email Zoe Lin with your polymer, process and target. The full CM50 data sheet goes out the same day, and a free 2–5 kg line-trial sample follows — produced under the same compounding conditions as commercial batches.
Both will reach full blackout. CM50 at 1–3% gives more headroom on let-down; N4066 with its tighter moisture ceiling is the usual choice when the gauge drops below about 15 µm and bubbles become the limiting defect.
The two film grades are characterised at different loads, which is why the figures in the table are not directly comparable. Use the value to judge processing behaviour inside the same grade family, not across families.
Yes — a thin black co-ex layer is a normal use. Tell us the layer thickness and the total structure and we will recommend a let-down that hits your opacity target without over-dosing the skin.
Tell us your polymer, process and target carbon black in the part. We reply with the CM50 spec sheet, a let-down recommendation and a firm factory quote.
CM50 is compounded for cable jacketing and wire sheathing, where clean running at line speed is decided by dispersion. This is that line.
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.