Made at our plant in Huizhou since 2016. We compound black masterbatch for PP woven sacks, FIBC jumbo bags and tarpaulin — high carbon loading for UV protection, clean enough to keep your tape from breaking on the loom.
A woven sack sits in the sun for months and gets lifted by its loops. The masterbatch has to protect the tape from UV without creating weak points that tear.
| Carrier resin | PP (PE or EVA blend on request) |
|---|---|
| Carbon black content | 20 – 45% (matched to your let-down and film/tape gauge) |
| Standard grades | PP103 · N4032 — see the full TDS chart |
| UV protection | High carbon loading for outdoor storage and transport life |
| Dispersion | Fine, screen-pack-friendly — fewer tape breaks on the line |
| Melt flow (MFR) | Matched to your tape extrusion line and draw ratio |
| Certifications | ISO 9001 / 14001 / 45001 |
Tell us your denier, draw ratio and let-down ratio — we match a grade to your line instead of handing you a catalogue number.
Sacks and FIBC stored outdoors keep their strength longer when the carbon is loaded for UV, not just for color.
Undispersed carbon is what snaps tape on the loom. We filter for it, so your loom keeps running.
No trading-company layer. A firm factory quote and a faster answer on price and lead time.
Run a trial lot through your tape line before you commit. We keep your spec confidential.
Typical woven and bulk-bag applications our black masterbatch is compounded for:
Rice, fertilizer, feed and cement sacks with outdoor storage life.
One-tonne bulk bags, fabric and lifting loops where UV matters.
Coated and woven covers, greenhouse shade nets.
Produce and firewood mesh that needs clean extrusion.
Woven PP and FIBC are drawn hard: tape is stretched several times its extruded length, so a defect that would be cosmetic in a moulded part becomes a tape break here.
| Product | Typical let-down | What to specify |
|---|---|---|
| Indoor woven sack | 2–4% | Standard black PP grade, colour consistency |
| FIBC / bulk bag (outdoor) | 2–4% | UV-stabilised grade, carbon at 2–3% in tape |
| Agricultural / sandbag | 2–4% | Weathering plus mechanical retention |
| Co-extruded liner layer | per film spec | PE-carrier film grade, not the PP tape grade |
See the black masterbatch grade overview for carriers, and the grades page for the loading ranges we run.
Carbon black that is not properly dispersed is the usual cause of tape breaks. We compound for fine dispersion and filter-pressure consistency, so the tape keeps its tensile strength at your draw ratio.
It depends on how long the bag will be stored outdoors and at what let-down you run. Share your storage life target and let-down ratio and we will propose a loading.
Most sack makers prove the grade on one or two pallets before moving to container volumes. We quote a trial price and a production price separately, so you can test without committing to a container.
Typically 5–10 days to most markets, packed with let-down guidance so your line can run it directly.
Tell us what you are running and how much you need. 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.
Woven bag compounds are judged on gels and on throughput. This is the line and the QC lab.
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.