Protect wire splices, probes, sensors, terminals, connectors and components where a standard sleeve cannot pass over the largest feature or cannot form a close fit after installation.
| erm | Meaning | Buyer check |
|---|---|---|
| Expanded ID | Internal diameter before recovery | Clears the largest connector, terminal or transition |
| Recovered ID | Free-recovered diameter after the specified process | Smaller than the |
| Recovered wall | Nominal wall after free recovery | Protection without excessive bulk |
| Shrink ratio | Relationship between expanded and recovered diameter | Covers geometry without severe wrinkles or stress |
| Longitudinal change | Length change during recovery | Cut length keeps protected edges covered |
| Recovery process | Validated temperature, time and heating method | Component tolerates uniform heating |
Basic sizing rule: Select an expanded ID that clears the largest feature and a recovered ID that grips the smallest target section. Confirm wall, length change, transition geometry and component temperature in a recovery trial target gripping section
Close-fitting protection against abrasion, elevated temperature and localized electrical stress.
Protect sensitive sections while maintaining a compact outer profile.
Cover changes in diameter where an as-extruded sleeve cannot fit closely.
Protection in aerospace, energy, automotive, electronics and qualified medical-equipment assemblies.
Peek heat-shrink sample should reproduce the real component geometry and heating method. The approval record should state expanded ID, recovered ID, recovered wall, cut length, longitudinal change, heating equipment, temperature, dwell time and the observed condition after recovery.
| Observed problem | Likely cause | Review |
|---|---|---|
| Incomplete recovery | Insufficient temperature, time or heat transfer | Heating method, calibration, heat sink and dwell |
| Wrinkles or bridging | Ratio too high, irregular geometry or uneven heat | Size, transition angle, rotation and sequence |
| Longitudinal movement | Unaccounted length change or poor positioning | Cut allowance, fixture and recovery direction |
| Cracking or edge damage | Sharp edges, excessive stress or overheating | Edge radius, pass-over force and uniformity |
| Damage to protected part | Part limit below recovery requirement | Adhesive, solder, coating, sensor and jacket limits |
| Poor moisture sealing | No adhesive or hermetic end seal | End geometry, overlap, adhesive and leak test |
Is PEEK heat shrink the same as standard fluoropolymer heat shrink?
No. PEEK heat shrink and fluoropolymer heat shrink differ in polymer structure, stiffness, shrink behavior, recovery process and application limits. Zeus describes its PEEKshrink product as a shrink-to-fit PEEK layer for high-temperature, chemical, pressure, wear and dielectric environments, and publishes product-specific shrink ratios and formats. Those Zeus values are not WELLELE specifications, but they show why material name and shrink ratio must be confirmed together. Select by the component geometry, recovery temperature, expanded and recovered IDs, wall, longitudinal change and required environmental performance
Does heat shrink create a hermetic or moisture-proof seal?
Not automatically. PEEK heat shrink can form a close-fitting protective layer, but a tight mechanical fit is not the same as a hermetic or pressure-tight seal. Zeus describes PEEKshrink as a protective “second skin” over components; it does not state that every recovered assembly becomes hermetic. Sealing depends on end geometry, overlap, surface condition, adhesive or sealant, pathways along wires and the specified leak-test method. If moisture ingress or hermeticity is a requirement, define the allowable leakage and validate the complete assembly.
Why does heat shrink Mylar tubing wrinkle?
Wrinkling is commonly caused by oversized initial ID, uneven heat, sharp component geometry changes, trapped air or the wrong shrink sequence.
Can the tube cover an irregular component?
t can be evaluated for connectors, probes and transitions, but an irregular shape increases the risk of wrinkles, bridging, trapped air, wall thinning and longitudinal movement. Zeus notes that PEEK heat shrink can be recovered using systems such as an IR oven, convection oven or heat gun, showing that heat delivery is part of the process. Select an expanded ID that clears the largest feature and a recovered ID that can grip the smallest section, then run a trial on the real component. Rounded edges and gradual transitions generally reduce local stress
What information is required for sizing?
Provide the maximum pass-over diameter, minimum gripping diameter, protected length, required recovered wall, transition geometry, sharp edges, nearby materials and the maximum temperature the component can tolerate. Also state the operating environment and heating equipment. Zeus publishes expanded ID, shrink ratio, cut/spooled formats and multiple recovery methods for its own PEEKshrink product; these are supplier-specific values, but they confirm the essential sizing variables. WELLELE must issue its own expanded/recovered dimensions and recovery instructions after feasibility
Can I request recovery samples?
Yes, when the requested size and material are feasible. The most useful trial uses the actual component, production heating equipment and intended fixture. Record expanded ID, recovered ID, wall, cut length, heating temperature, dwell, rotation or airflow, longitudinal movement and final appearance. Check the component after cooling for damage to solder, adhesives, coatings, jackets or sensors. Approve both the tube and the recovery process before volume production
What affects MOQ and lead time?
For PEEK heat shrink, commercial feasibility depends on expanded and recovered diameters, wall, shrink ratio, material availability, tooling, expansion process, cut or spooled format, color, inspection and packaging. A new geometry may require development and recovery trials before a production quotation is final. WELLELE should separate development samples, validation quantity and production MOQ and should not promise a recovery range until its own process data are confirmed
Mylar sleeve for flange bolt insulation