LAN Cable Jacket Surface Finish: DX752A at High Line Speed

Lumps on a LAN cable jacket are almost never a polymer problem — they are die drool. Material creeps out of the die gap, oxidises on the hot lip, and periodically breaks off into the jacket, where it shows up as a bump that fails the diameter gauge and scuffs the installer's hand in the conduit. Xiangxi DX752A — white pellet silicone masterbatch on a PE+ carrier at 0.5–1.2%, usually 0.8% on a 0.5 mm jacket — clears the drool, drops torque, and gives the smooth low-friction skin that long conduit pulls need.

Why a LAN cable jacket gets lumps and rough skin

• Die drool — low-viscosity fractions and additive residues separate out at the die exit, bake on the lip, and release as particles into the jacket.

• Melt fracture at speed — jacketing lines run hard for capacity; past the critical shear rate the surface goes orange-peel and the jacket starts to shimmer.

• High jacket friction — a rough skin raises pulling tension, which is what limits how many cables you can pull through one conduit.

Routes to a smooth LAN cable jacket

Xiangxi wire and cable lubricant grades

Which grade for LAN cable jacket

DX752A is the high-speed jacketing grade: it acts at the die wall, which is where drool and melt fracture both start, and it does it at a low dosage that keeps the jacket cost per metre unchanged. Above roughly 800 m/min, or on small-diameter jacket where shear is highest, DX752C is the stronger option. For a halogen-free riser jacket with meaningful filler loading, use DX750 at 1.0–1.5%; plenum-rated jackets should be validated separately on your own compound.

Processing notes

• Add as a hopper dry blend with the jacketing compound, or feed with a loss-in-weight feeder for tight control on a high-speed line.

• Start at 0.5%, then 0.8%, then 1.2%. Judge each step by the diameter gauge and lump count, not by torque alone.

• Give the line 15–20 minutes to stabilise after each dosage change before you take a verdict — drool builds and clears on a time constant, not instantly.

• Keep the die-lip temperature zone unchanged during the trial so you are testing the masterbatch, not a thermal change.

Results to verify in your own lab

• Lump count: fewer diameter-gauge alarms per kilometre, verified against your ISO/IEC 11801 jacket OD tolerance.

• Surface finish: higher and more consistent 60° gloss, no orange-peel under raking light.

• Pulling friction: lower jacket-on-conduit friction, measured on your own pull rig or by ISO 8295.

• Print quality: inkjet or hot-foil legend adhesion unchanged, checked with a tape test.

Frequently asked questions

How fast does DX752A clear existing die drool?

You should see the torque move within minutes, and the die lip will visibly stop accumulating within the first hour. Give the line one full shift before you judge the lump count, since deposits already on the lip have to work themselves out.

Do I still need a fluoropolymer processing aid?

In most LAN jacketing recipes, no — DX752A replaces it and removes the conditioning period. Where a line is badly scorch-limited, run both and compare the lump count per kilometre.

Will it affect the jacket colour or the stripe?

No. The pellet is white and the carrier is natural-coloured, so coloured and striped jackets keep their shade; better pigment dispersion usually reduces specks.

Does it change the jacket's flame rating?

It does not contribute flame retardancy or halogen. For CM, CMR or CMP ratings, re-test the finished cable to the relevant UL 444 or UL 910 procedure on your own compound.

Is it suitable for the insulation layer of the same cable?

Yes, if the insulation is PE-based. Thin-wall data insulation usually runs better on DX752C at 1.0–1.5%.

Is the masterbatch compliant with EU chemical rules?

Yes. Xiangxi wire and cable lubricant grades are RoHS and REACH compliant, SGS tested, manufactured under ISO 9001, and sold with a COA per batch.