PET SELF-WRAPPING SLEEVING
Longitudinally self-closing sleeving that wraps around an existing harness without disconnecting wires or removing terminals. Used for branch harnesses, retrofit work, service sections and any routing that needs to be reopened. Available in PET braid, textile and two-layer constructions.
Product structures
Polyester monofilament braid formed into a longitudinal self-closing profile. Braided texture, abrasion resistant, light, good heat dissipation; hot-cut edges prevent fraying. Used for engine-bay-external harnesses, internal routing and control cabinets.
Softer hand, better conformity when closed; for visible areas requiring good appearance and for positions where wire insulation needs protection. Abrasion resistance is lower than PET braid.
Abrasion-resistant braid outside with a soft liner inside, for positions that need both — through sheet-metal holes, near bracket edges.
Selection
The published figure is the flat (unrolled) width, not the bundle diameter. Confirm all six points and the specification is usually settled in one pass.
Width vs bundle diameter
Formula: flat width ≈ π × bundle diameter ÷ (1 − overlap); covered diameter ≈ width × (1 − overlap) ÷ π.
| Flat width (mm) | 0% overlap | 30% overlap | 50% overlap |
|---|---|---|---|
| 10 | approx. 3.1 mm | approx. 2.2 mm | approx. 1.5 mm |
| 20 | approx. 6.3 mm | approx. 4.4 mm | approx. 3.1 mm |
| 25 | approx. 7.9 mm | approx. 5.5 mm | approx. 3.9 mm |
| 38 | approx. 12.0 mm | approx. 8.4 mm | approx. 6.0 mm |
| 50 | approx. 15.9 mm | approx. 11.1 mm | approx. 7.9 mm |
| 75 | approx. 23.8 mm | approx. 16.7 mm | approx. 11.9 mm |
| 100 | approx. 31.8 mm | approx. 22.2 mm | approx. 15.9 mm |
| 150 | approx. 47.7 mm | approx. 33.4 mm | approx. 23.8 mm |
| 200 | approx. 63.6 mm | approx. 44.5 mm | approx. 31.8 mm |
A 25–50% overlap is needed for stable coverage; use 50% where vibration is present.
State whether the bundle diameter given is the tight or the natural maximum — the two can differ by more than 20% on a real harness.
Trade-off
Installation: self-wrapping closes laterally, no disconnection; closed (push-through) must be threaded from the harness end. Stage: self-wrapping for retrofit, service and branch additions; closed for new builds and volume production.
Efficiency and coverage: self-wrapping is fast at a single point but slower on long straight runs; coverage depends on overlap and the seam remains an opening. Using both on one machine is normal.
Installation pitfalls
Usable bundle diameter is roughly one third of the width with no overlap, and closer to one quarter at 30% overlap. A 10 mm sleeve does not cover a 10 mm bundle.
Closing just enough to meet leaves the seam open under vibration. Start at 25%, use 50% where vibration is present.
PET braid must be hot-cut; otherwise the edge frays continuously and the sleeve works loose.
PET swells in long-term oil contact and loses strength; switch to a fibreglass construction near heat sources.
FAQ
If the harness can be threaded from the end, use closed braided sleeving for efficiency and consistent coverage. If it is already installed, cannot be disconnected, or needs periodic inspection, use self-wrapping.
Measure the bundle diameter, estimate the circumference (π × diameter) and divide by (1 − overlap). A 20 mm bundle at 30% overlap needs roughly 90 mm flat width.
The construction allows it, but each cycle loads the braid edge. For frequently serviced positions choose hot-cut, reinforced edges and secure both ends with ties after service.
Yes, per structure. Flame performance depends on yarn and braid density, so it is verified against the selected specification rather than the series.
RFQ
Send all eight points for a specific specification:
Related products
Samples and selection
Include minimum and maximum bundle diameter, environment, temperature and flame rating, cut length and expected volume.
