The Last Step in Catheter Assembly Shouldn't Risk the Whole Build.
Skiving traditional FEP heat shrink tubing takes time — and when the blade slips, it takes the catheter with it. Junkosha Peelable HST removes with a single slit. No skiving. No damage risk. Full bonding performance preserved. Available in Israel through Koto Electronics.
Skiving Is the Most Expensive Step That Doesn't Appear on the BOM
Standard FEP heat shrink tubing performs its process function — then requires a blade to remove it. On structures measured in fractions of a millimetre, that blade is a yield risk at the end of a build that may have taken hours.
Yield Loss at the Final Step
When the skiving blade contacts the catheter shaft, bond site, or tip, the damage typically scraps the assembly — not just the tubing. The cost is not in the heat shrink material. It is in the hours of work it covered.
Cycle Time That Compounds at Volume
Skiving is slow and operator-dependent. On thin-wall or small-diameter catheters, it demands careful tool control and individual inspection after every removal. As volume increases, the time and risk accumulate proportionally.
Ergonomic Risk That Scales with Demand
Skiving is a repetitive precision task performed under magnification. Operator fatigue degrades consistency across shifts. It is not a training problem — it is a process-design problem that standard heat shrink tubing makes unavoidable.
One Slit. Full Length. No Blade Near the Catheter.
Junkosha designed Peelable HST around the removal step. A single longitudinal slit at one end initiates the peel. The tubing then separates cleanly along its entire length — no tools, no blade contact with the catheter surface, no unpredictable resistance. Bonding performance is identical to standard FEP HST.
- ✓Skiving damage eliminated, not managedThe failure mode is removed from the process. Because the tool never contacts the catheter during removal, the inspection burden at the removal step goes from variable to predictable.
- ✓Same bonding and shrink performanceTip forming, balloon bonding, Pt. marker, G.W. port bonding, tube bonding, and catheter lamination — all processes perform identically to standard FEP HST. The change is in the removal, not the process.
- ✓USP Plastic Class VI — certificates availableBiocompatibility is certified to USP Plastic Class VI requirements. Compatible with EtO and Steam sterilization. Certificates on request — no qualification ambiguity.
- ✓Six families, 0.9 Fr to 34.3 FrFrom ultra-small guidewire coils (NFPM, 0.38 mm expanded) through TAVI and large-bore sheath applications (NFP, 11.43 mm expanded). One supplier for the entire catheter OD range your process requires.
- ✓Industry's first — and still the benchmarkJunkosha invented peelable FEP heat shrink tubing. The product is protected by patents in the US, EU, Japan, and China across multiple generations. It is not a commodity adaptation — it is the original.
Catheter Manufacturing Applications
Compatible across all standard catheter build steps
- Tip Forming
Controlled distal tip shaping on balloon and diagnostic catheters
- Balloon Bonding
HST compression of balloon neck during adhesive cure
- Pt. Marker
Platinum marker band retention during catheter assembly
- G.W. Port Bonding
Guidewire port sealing on over-the-wire catheter designs
- Tube Bonding
Outer jacket bonding and lap joint formation
- Catheter Lamination
Pebax / Nylon coat reflow over braid and liner assembly
How to Select Your Size
- 1Identify your material O.D. (maximum) and target product O.D. (minimum)
- 2Select a part where Expanded I.D. > material O.D. and Recovered I.D. < target O.D. − 0.1 mm
- 3Request free samples through Koto Electronics
- 4Qualify in your lab against your mandrel and reflow parameters
Every French Size. Every Application.
All families use fluoropolymer material at 200°C recommended processing temperature. Select by shrink ratio, transparency, size range, and catheter application.
Highest shrink ratio — tight conformance on small OD
Broadest standard coverage — 10 sizes, 1.8:1 ratio
Ultra Small — sub-1.3 Fr guidewire and micro-catheter applications
Widest size range — standard through large sheath diameters
Transparent at 1.6:1 — visual inspection without sacrificing shrink
Extra-large coverage — up to 34.3 Fr for guiding sheaths and TAVI
Complete Part Number Reference
All dimensions in mm. Imperial values for reference only — manufactured and inspected in metric. Recommended processing temperature 200°C / 392°F. USP Plastic Class VI compliant. Flammability UL V-0.
NFPX
2.0:1 Shrink · Transparent · 1,000 mm · MOQ 100 pcs| Part No. | Exp. I.D. (mm) | Rec. I.D. (mm) | Wall (mm) | Exp. I.D. (in) | Rec. I.D. (in) | French Size | |
|---|---|---|---|---|---|---|---|
| NFPX0045 | 0.60 | 0.30 | 0.20 ±0.05 | 0.0236" | 0.0118" | 1.3 – 1.5 Fr | |
| NFPX0090 | 1.20 | 0.60 | 0.25 ±0.05 | 0.0472" | 0.0236" | 2.2 – 2.3 Fr | |
| NFPX0150 | 2.00 | 1.00 | 0.275 ±0.05 | 0.0787" | 0.0394" | 3.4 – 5.7 Fr |
NFPR
1.8:1 Shrink · Translucent · 1,700 mm · MOQ 100 pcs| Part No. | Exp. I.D. (mm) | Rec. I.D. (mm) | Wall (mm) | Exp. I.D. (in) | Rec. I.D. (in) | French Size | |
|---|---|---|---|---|---|---|---|
| NFPR006 | 0.72 | 0.40 | 0.25 ±0.05 | 0.0283" | 0.0157" | 1.6 – 1.8 Fr | |
| NFPR007 | 0.90 | 0.50 | 0.25 ±0.05 | 0.0354" | 0.0197" | 1.9 – 2.4 Fr | |
| NFPR008 | 1.08 | 0.60 | 0.25 ±0.05 | 0.0425" | 0.0236" | 2.2 – 2.9 Fr | |
| NFPR010 | 1.26 | 0.70 | 0.25 ±0.05 | 0.0496" | 0.0276" | 2.5 – 3.5 Fr | |
| NFPR011 | 1.44 | 0.80 | 0.25 ±0.05 | 0.0567" | 0.0315" | 2.8 – 4.0 Fr | |
| NFPR013 | 1.62 | 0.90 | 0.25 ±0.05 | 0.0638" | 0.0354" | 3.1 – 4.6 Fr | |
| NFPR014 | 1.80 | 1.00 | 0.25 ±0.05 | 0.0709" | 0.0394" | 3.4 – 5.1 Fr | |
| NFPR018 | 2.34 | 1.30 | 0.25 ±0.05 | 0.0921" | 0.0512" | 4.3 – 6.7 Fr | |
| NFPR022 | 2.88 | 1.60 | 0.28 ±0.05 | 0.1134" | 0.0630" | 5.2 – 8.4 Fr | |
| NFPR029 | 3.78 | 2.10 | 0.30 ±0.05 | 0.1488" | 0.0827" | 6.7 – 11.1 Fr |
NFPM
1.6:1 Shrink · Ultra Small · Translucent · 1,000 mm · MOQ 100 pcs| Part No. | Exp. I.D. (mm) | Rec. I.D. (mm) | Wall (mm) | Exp. I.D. (in) | Rec. I.D. (in) | French Size | |
|---|---|---|---|---|---|---|---|
| NFPM0030 | 0.38 | 0.23 | 0.20 ±0.05 | 0.0150" | 0.0091" | 0.9 – 1.0 Fr | |
| NFPM0037 | 0.46 | 0.28 | 0.20 ±0.05 | 0.0181" | 0.0110" | 1.0 – 1.2 Fr | |
| NFPM0042 | 0.51 | 0.33 | 0.20 ±0.05 | 0.0201" | 0.0130" | 1.2 – 1.3 Fr |
NFPS
1.6:1 Shrink · Translucent · 1,700 mm (std) / 1,000 mm (large) · MOQ 100 / 50 pcs| Part No. | Exp. I.D. (mm) | Rec. I.D. (mm) | Wall (mm) | Exp. I.D. (in) | Rec. I.D. (in) | French Size | |
|---|---|---|---|---|---|---|---|
| NFPS005 | 0.64 | 0.40 | 0.20 ±0.05 | 0.0252" | 0.0157" | 1.6 Fr | |
| NFPS007 | 0.80 | 0.50 | 0.20 ±0.05 | 0.0315" | 0.0197" | 1.9 – 2.1 Fr | |
| NFPS008 | 0.96 | 0.60 | 0.20 ±0.05 | 0.0378" | 0.0236" | 2.2 – 2.6 Fr | |
| NFPS009 | 1.12 | 0.70 | 0.20 ±0.05 | 0.0441" | 0.0276" | 2.5 – 3.0 Fr | |
| NFPS010 | 1.28 | 0.80 | 0.20 ±0.05 | 0.0504" | 0.0315" | 2.8 – 3.5 Fr | |
| NFPS012 | 1.44 | 0.90 | 0.20 ±0.05 | 0.0567" | 0.0354" | 3.1 – 4.0 Fr | |
| NFPS013 | 1.60 | 1.00 | 0.20 ±0.05 | 0.0630" | 0.0394" | 3.4 – 4.5 Fr | |
| NFPS017 | 2.08 | 1.30 | 0.20 ±0.05 | 0.0819" | 0.0512" | 4.3 – 6.0 Fr | |
| NFPS021 | 2.56 | 1.60 | 0.275 ±0.05 | 0.1008" | 0.0630" | 5.2 – 7.4 Fr | |
| NFPS028 | 3.36 | 2.10 | 0.275 ±0.05 | 0.1323" | 0.0827" | 6.7 – 9.8 Fr | |
| NFPS036 | 4.45 | 2.79 | 0.275 ±0.05 | 0.1752" | 0.1098" | 8.8 – 13.1 Fr | MOQ 50 |
| NFPS038 | 4.78 | 2.92 | 0.275 ±0.05 | 0.1882" | 0.1150" | 9.2 – 14.1 Fr | MOQ 50 |
| NFPS052 | 6.05 | 4.32 | 0.275 ±0.05 | 0.2382" | 0.1701" | 13.4 – 18.0 Fr | MOQ 50 |
NFPSC
1.6:1 Shrink · Transparent · 1,700 mm · MOQ 100 pcs| Part No. | Exp. I.D. (mm) | Rec. I.D. (mm) | Wall (mm) | Exp. I.D. (in) | Rec. I.D. (in) | French Size | |
|---|---|---|---|---|---|---|---|
| NFPSC005 | 0.64 | 0.40 | 0.20 ±0.05 | 0.0252" | 0.0157" | 1.6 Fr | |
| NFPSC007 | 0.80 | 0.50 | 0.20 ±0.05 | 0.0315" | 0.0197" | 1.9 – 2.1 Fr | |
| NFPSC008 | 0.96 | 0.60 | 0.20 ±0.05 | 0.0378" | 0.0236" | 2.2 – 2.6 Fr | |
| NFPSC009 | 1.12 | 0.70 | 0.20 ±0.05 | 0.0441" | 0.0276" | 2.5 – 3.0 Fr | |
| NFPSC010 | 1.28 | 0.80 | 0.20 ±0.05 | 0.0504" | 0.0315" | 2.8 – 3.5 Fr | |
| NFPSC012 | 1.44 | 0.90 | 0.20 ±0.05 | 0.0567" | 0.0354" | 3.1 – 4.0 Fr | |
| NFPSC013 | 1.60 | 1.00 | 0.20 ±0.05 | 0.0630" | 0.0394" | 3.4 – 4.5 Fr | |
| NFPSC017 | 2.08 | 1.30 | 0.20 ±0.05 | 0.0819" | 0.0512" | 4.3 – 6.0 Fr | |
| NFPSC021 | 2.56 | 1.60 | 0.275 ±0.05 | 0.1008" | 0.0630" | 5.2 – 7.4 Fr | |
| NFPSC028 | 3.36 | 2.10 | 0.275 ±0.05 | 0.1323" | 0.0827" | 6.7 – 9.8 Fr |
NFP
1.4:1 Shrink · Translucent · 1,500 mm (std) / 1,500 mm (XL) · MOQ 100 / 25 pcs| Part No. | Exp. I.D. (mm) | Rec. I.D. (mm) | Wall (mm) | Exp. I.D. (in) | Rec. I.D. (in) | French Size | |
|---|---|---|---|---|---|---|---|
| NFP006 | 0.71 | 0.50 | 0.20 ±0.05 | 0.0280" | 0.0197" | 1.8 – 1.9 Fr | |
| NFP007 | 0.86 | 0.60 | 0.20 ±0.05 | 0.0339" | 0.0236" | 2.2 – 2.3 Fr | |
| NFP008 | 1.00 | 0.70 | 0.20 ±0.05 | 0.0394" | 0.0276" | 2.5 – 2.7 Fr | |
| NFP010 | 1.14 | 0.80 | 0.20 ±0.05 | 0.0449" | 0.0315" | 2.8 – 3.1 Fr | |
| NFP011 | 1.29 | 0.90 | 0.20 ±0.05 | 0.0508" | 0.0354" | 3.1 – 3.6 Fr | |
| NFP013 | 1.57 | 1.10 | 0.20 ±0.05 | 0.0618" | 0.0433" | 3.7 – 4.4 Fr | |
| NFP017 | 2.00 | 1.40 | 0.20 ±0.05 | 0.0787" | 0.0551" | 4.6 – 5.7 Fr | |
| NFP021 | 2.30 | 1.70 | 0.25 ±0.05 | 0.0906" | 0.0669" | 5.5 – 6.6 Fr | |
| NFP026 | 2.84 | 2.10 | 0.25 ±0.05 | 0.1118" | 0.0827" | 6.7 – 8.3 Fr | |
| NFP030 | 3.38 | 2.50 | 0.25 ±0.05 | 0.1331" | 0.0984" | 7.9 – 9.9 Fr | |
| NFP064 | 7.62 | 5.08 | 0.33 ±0.05 | 0.3000" | 0.2000" | 15.7 – 22.7 Fr | MOQ 25 |
| NFP074 | 8.89 | 5.93 | 0.33 ±0.05 | 0.3500" | 0.2335" | 18.3 – 26.6 Fr | MOQ 25 |
| NFP085 | 10.16 | 6.77 | 0.33 ±0.05 | 0.4000" | 0.2665" | 20.9 – 30.4 Fr | MOQ 25 |
| NFP095 | 11.43 | 7.62 | 0.33 ±0.05 | 0.4500" | 0.3000" | 23.4 – 34.3 Fr | MOQ 25 |
Custom shrink ratios, cut-to-length, and pre-slit options available. Contact Koto Electronics.
Technical Properties
Representative values across product families. Consult the full datasheet for family-specific data.
| Property | Unit | NFPX | NFPR | NFPM | NFPS | NFPSC | NFP |
|---|---|---|---|---|---|---|---|
| Specific Gravity | — | 2.13 | 2.1 | 2.1 | 2.1 | 2.13 | 2.1 |
| Transparency | — | Very Good | Good | Good | Good | Very Good | Good |
| Sterilization | — | EtO, Steam | EtO, Steam | EtO, Steam | EtO, Steam | EtO, Steam | EtO, Steam |
| Water Absorption | % | <0.01 | <0.03 | <0.03 | <0.03 | <0.01 | <0.03 |
| Oxygen Index | % | >65 | >32 | >32 | >32 | >65 | >32 |
| Flammability (UL) | — | V-0 | V-0 | V-0 | V-0 | V-0 | V-0 |
| Weather Resistance | — | Excellent | Excellent | Excellent | Excellent | Excellent | Excellent |
| Chemical Resistance | — | Very Good | Very Good | Very Good | Very Good | Very Good | Very Good |
| Melting Temperature | °C | 200–275 | 245–275 | 245–275 | 245–275 | 200–275 | 245–275 |
| Service Temperature | °C | 200 | 200 | 200 | 200 | 200 | 200 |
| Shrink Temperature | °C | 60–220 | 60–240 | 60–240 | 60–220 | 60–240 | 60–240 |
| Tensile Strength | MPa | 23–24 | 26–30 | 30–34 | 30–32 | 23–36 | 27–31 |
| Elongation at Break | % | 231 | 329 | 201 | 349 | 272 | 363 |
| Tensile Modulus | MPa | 460 | 422 | 470 | 387 | 411 | 362 |
Frequently Asked Questions
Does Junkosha Peelable HST bond and laminate as well as standard FEP heat shrink tubing?
How does the peeling actually work?
Which product family should I specify?
Is Junkosha Peelable HST biocompatible?
What shrink temperature should I use?
Are custom sizes, cut-to-length, or pre-slit options available?
Start with Free Samples. Qualify in Your Lab.
Junkosha's process starts with samples — not a purchase order. Identify your target dimensions, request samples through Koto Electronics, and test them against your mandrel and reflow parameters. The decision should be based on results in your lab.