Select custom polyimide tube, PI tube and Kapton tube by manufacturing process, critical dimension, insulation requirement, assembly method and supplier qualification needs. Compare extruded, dip-coated, flat-wound and spiral-wound PI tubing.
WELLELE manufactures polyimide tubing by extrusion, dip coating, flat winding and spiral winding. These routes produce different seam structures, lumen geometry, wall builds, length formats and size capabilities, so the correct PI tube should be selected by process as well as material.
Across the available families, custom IDs from small capillary sizes to approximately 50 mm and wall thicknesses from about 0.015 mm to 0.35 mm can be reviewed. The exact combination depends on process, material system, tolerance, length and application
Start with the component function: insertion, insulation, routing, protection, guiding or sleeve coverage. Then define the primary controlled dimension before selecting the manufacturing process.
For production use, PI tubing should be evaluated by cut-end condition, insertion force, bend radius, packaging method, feeding behavior and lot-to-lot consistency.
Electrical insulation performance should be specified by wall thickness, voltage type, test duration, humidity condition and operating temperature. Material-family data should not be treated as finished-tube test results.
Quality review starts by defining the controlled characteristic. For PI tubing, the critical characteristic may be ID, OD, wall thickness, length, cut-end condition, seam structure, roundness or insulation performance.
The fastest quotation starts with application, drawing, ID, OD, wall thickness, length, critical dimension, process preference, operating condition and annual quantity.
Polyimide tube is a high-performance tubing family used where thermal stability, electrical insulation, thin-wall construction and dimensional stability are required. Depending on the manufacturing process, PI tubing may be extruded, dip-coated, flat-wound or spiral-wound.
The process determines the tube structure, seam condition, wall build, length format, dimensional behavior and suitable application.
| Trust Question | Who Asks It | WELLELE Page Should Answer |
|---|---|---|
| Which process creates this tube? | Design / SQE | Extruded, dip-coated, flat-wound, spiral-wound |
| Is there a seam? | Design / Insulation | No wound seam / axial seam / spiral seam |
| Which dimension is controlled? | Design / Quality | ID, OD, wall, length |
| How is it measured? | SQE | Gauge, optical, sampling method |
| What is the temperature condition? | Insulation / Quality | Continuous, peak, duration |
| What is the dielectric test condition? | Insulation | Voltage, AC/DC, wall, method |
| Can it be cut and assembled? | Process | Cut-end, insertion, packaging |
| What documents are available? | SQE / Purchasing | Product-specific document matrix |
| Is it industrial or medical scope? | Quality / Regulatory | Separate medical-equipment page |
| Process | Best Starting Point | Primary Buyer Concern |
|---|---|---|
| Extruded Polyimide Tubing | Non-wound structure, lumen control, small tube or coil format | ID stability, eccentricity, cut-end, long-coil consistency |
| Dip-Coated Polyimide Tubing | Thin-wall precision tubing and coating-based construction | pinhole, wall uniformity, surface, cure condition |
| Flat-Wound Polyimide / Kapton Tube | Compact insulation, short lengths, film-based construction | seam orientation, cut length, insertion, small-bore fit |
| Spiral-Wound Polyimide Tubing | Larger bore sleeves and adjustable wall build | overlap, spiral seam, roundness, cut-end release |
Start with the required structure: non-wound precision tube, coated thin wall, flat film sleeve or spiral large-bore sleeve. Then define the critical dimension and application condition.
Can I use PI tube for high-temperature insulation?
Yes, but temperature must be specified as continuous exposure, peak exposure, duration and required retained property.
What causes PI tube cut-end defects?
Cut-end defects may come from blade condition, wall thickness, unsupported cutting, tube softness, lumen size or winding structure.
What should be inspected for PI tubing?
Inspection should match the critical characteristic: ID, OD, wall thickness, length, roundness, cut-end condition, seam, or insulation performance.
What information is needed for quotation?
Send application, drawing, ID, OD, wall thickness, length, tolerance, critical dimension, process preference, annual quantity and required documents.
Which PI tubing process should I choose?
Choose extruded tubing for a non-wound lumen and coil or precision tube direction; dip-coated for coating-based thin walls and surface control; flat-wound for compact short sleeves; and spiral-wound for larger IDs or adjustable film wall builds
Is every polyimide tube a Kapton tube?
No. Kapton is a branded polyimide film. A tube should be called Kapton tubing only when that film source and traceability support the name. Extruded or coated PI resin tubing and tubes made from other PI films should use the generic polyimide description.
Engineering recommendation
Select polyimide tubing from the complete component dimensions, operating conditions, manufacturing process and acceptance criteria. Use samples to confirm fit and function before volume production.
Submit Polyimide Tube Parameters
Extruded Polyimide Tubing