The top of the concentration range: 65% carbon black, no carrier resin, for ABS, PS and PC modification. Deep jetness with maximum let-down flexibility — technical compounders dilute to wherever the application needs the carbon to be.
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 | 65% |
| Carrier system | Carrier-free (CB only) |
| Ash content | <10% (carbon black only) |
| Melt flow rate (190 °C) | on request |
| Moisture | <0.50% |
| Recommended let-down | 1–3% |
| Density | — |
| FOB price range | USD 3.00–6.00 / 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 SY-65 shows up in our export business, and why buyers pick it.
Engineering-resin modification where jetness and conductivity thresholds matter.
Deep jet surfaces at the lowest possible addition.
65% concentrate lets you put exactly 0.5%, 1% or 3% carbon into the compound by dosage alone.
A concentrate to let down into your own carrier system.
The formulation logic behind the spec sheet — what the chart does not say.
Carrier-free at 65% is the whole point: adding SY-65 to a melt adds carbon black and nothing else. The host resin — ABS, PS, PC — stays the only polymer in the system, so HDT, impact and flow remain exactly what your base compound specifies.
Jetness scales with real carbon in the wall: at 65%, 2% let-down puts 1.3% carbon in the part — the deep-black region where lower grades need 4–5% addition and drag carrier along with it.
Screening and dispersion are the hard part at this loading; the ash ceiling below 10% reflects carbon black purity plus compounding aids only.
High loading is bought for what it puts into the part. It is earned on the line — these are the four things that decide whether you get the dispersion you paid for.
At 65% the carbon fraction dominates the pellet, and moisture carried in with it shows up in the part faster than it does at 40%. Where a 40% grade might tolerate a marginal hopper, a 65% grade will put bubbles, streaks or a speckle into a visible surface. Dry to the figure on the TDS and keep it dry to the screw.
Very high carbon loadings make for a denser, sometimes less free-flowing pellet. On vacuum loaders and long flexible runs, bridging at a bend or a receiver is the usual failure — not a starving feeder. If your conveying system is already marginal, test it on this grade before you plan a full campaign.
Dispersing carbon black is work, and the work scales with how much carbon each pellet carries. A twin-screw line with a proper mixing section handles 65% without drama; a single-screw line being asked to do more than it was set up for will deliver a reading that looks like a bad lot but is actually a shear shortfall. If this is your first 65% grade, tell us the machine and we will say plainly whether it is set up for it — that conversation is cheaper than a failed campaign.
Because the carrier is gone, addition ratio maps almost linearly to final carbon content: at 65%, a 2% let-down puts 1.3% carbon in the wall. That predictability is the reason to buy carrier-free — but it also means an error in dosing shows up directly in the part, with no carrier phase absorbing the mistake. Gravimetric dosing on a carrier-free grade is worth the setup time.
Three ways to reach a deep-black engineering part, and what each one costs you elsewhere.
| Route | What enters the melt | Where it wins | Where it costs you |
|---|---|---|---|
| SY-65 (carrier-free, 65%) | Carbon black + compounding aids only | Your compound's HDT, impact and flow stay exactly as specified; deep jetness at low addition | Demands proper drying, conveying and shear — the line has to be set up for it |
| Matched-carrier grade at 40% | Carbon black + ABS/PS/PC carrier | Easier processing on average equipment | Carrier enters your formulation and dilutes the properties you paid the resin for |
| Pre-compounded black resin | Fully formulated compound | Simplest at the machine — no dosing decisions | You buy the black and the polymer together, at the compounder's price, and lose control of the formulation |
The rule of thumb: the more of your part's performance is carried by the base resin, the more a carrier-free grade is worth. If you are moulding a technical part where impact and HDT were specified for a reason, adding a carrier phase to save a little processing convenience is a poor trade. If you are running commodity parts on average equipment, the matched-carrier or pre-compounded route will often be cheaper end to end.
For engineering resins, any added carrier phase dilutes the properties you pay for in ABS/PC. Carrier-free means the modification math stays yours.
The standard grade is validated on ABS/PS/PC. For PA, PET, PBT we compound carrier-matched systems — ask with your resin grade and target carbon.
More per kg, less per part: at 1–2% let-down the finished-ton color cost usually beats a 40% grade. The quote shows both per-kg and per-finished-ton math.
Use the form below or email Zoe Lin with your polymer, process and target. The full SY-65 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.
Tell us your polymer, process and target carbon black in the part. We reply with the SY-65 spec sheet, a let-down recommendation and a firm factory quote.
SY-65 is compounded for conduit and profile applications. This is the compounding line and the QC laboratory.
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.