Heat Shrink Mylar Tube for Controlled Component Fit

WELLELE manufactures heat shrink Mylar/PET film tubing for components that need a thin polyester sleeve installed at a larger diameter and recovered by heat. Custom 2:1 constructions are available, with shrink starting around 90°C and application temperatures up to approximately 150°C, subject to the selected film, wall build and validated operating condition.

A successful polyester film tubing shrink fit depends on the complete component OD range, supplied tube ID, wall thickness, coverage length, heat source, actual part temperature, heating time and final appearance standard. Sample validation on the real component is recommended before volume production.

Key capabilities

  • Custom 2:1 3:1 heat-shrink construction
  • Shrink initiation around 90°C, product-specific validation required
  • Application temperature up to approximately 150°C by construction
  • Custom ID, wall, cut length and appearance criteria

Use this product when heat recovery is required and the component can tolerate the validated heating process

When to Use Heat Shrink Mylar Tube

Condition Recommended direction Reason
A tighter final sleeve fit is needed after heating Heat-shrink Mylar/PET tubing The tube recovers around the component
No controlled heating process is available Non-shrink PET film tubing Fit is defined by supplied ID and clearance
The component is heat-sensitive Review non-shrink or lower-temperature alternatives Heating may damage the component
The profile has steps or sharp changes Sample the actual part Geometry can trap air or cause wrinkles
Cosmetic appearance is critical Define wrinkle and surface standards Functional and cosmetic acceptance are different

Typical Applications

Heat shrink Mylar tube is mainly used where a thin polyester film sleeve must form a closer fit around an electrical or mechanical component after heating.

Electrical Components

Used to cover compact electrical parts where tape replacement or a cleaner sleeve appearance is preferred.

Coils and Windings

Used as a thin sleeve for coil covering and electrical insulation where controlled shrink fit is required.

  • mylar tube thin-wall polyester film tubing
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Sensors and Thermal Components and OEM

Used for selected sensor or thermal component proteUsed as a custom protective sleeve for production parts requiring defined ID, wall thickness and finished length.

Wire and Cable Assemblies

Used where the tube must remain around a wire or cable assembly after heat recovery.

Quality control

Construction and Manufacturing Process

Heat shrink Mylar tube belongs to the polyester film tubing family. In WELLELE’s process map, Mylar tube and Mylar heat shrink tube are associated with flat-rolling / film-based sleeve processes. The final construction should be confirmed by product series, required diameter, wall thickness and shrink behavior.
Polyester film
↓
Forming / winding
↓
Bonding / forming
↓
Cut length
↓
Heat recovery around component /  Quality control

  • Supplied ID, wall thickness and cut length are checked before shrink
  • Free and restrained shrink behavior can be evaluated under an agreed heating condition.
  • Post-shrink fit, coverage, wrinkles, end lifting, surface damage and electrical requirements are inspected to the approved sample or drawing.
  • Production approval should record the heat source, temperature setting, exposure time, part orientation and acceptance criteria.

Making the app managable

Technical capability and RFQ parameters

Parameter Custom capability RFQ requirement
Material PET/polyester film; Mylar name when traceable Film identity and document need
Shrink ratio 2:1 3:1 available Free or restrained shrink condition
Shrink start Around 90°C Heating equipment and cycle
Application temperature Up to about 150°C by product construction Continuous/peak temperature and duration
Supplied ID Custom Component maximum OD and installation clearance
Wall thickness Custom film/layer build Insulation, stiffness and wrinkle target
Cut length Custom Coverage before/after heating and tolerance
Longitudinal change Product and process specific Final coverage acceptance
Appearance Functional or cosmetic standard Wrinkle, burn, whitening and end condition
  • If your application does not require thermal recovery, review Non-Heat-Shrink Mylar Tube.
  • Factor Heat Shrink Mylar Tube Non-Heat-Shrink Mylar Tube
    Need heating? Yes No
    Main purpose Tighter final fit Stable sleeve / covering
    Sizing focus Initial ID + recovery Assembly clearance
    Common risk Wrinkles / uneven shrink Too tight / too loose
    Best for Components requiring fit after heating Parts requiring simple covering
    Main validation Shrink process window Insertion and clearance

Heat shrink Mylar tube is a shrinkable polyester film tube used as an insulating, protective or covering sleeve. After heating, the tube recovers around the component to create a closer fit than a non-heat-shrink sleeve.

It is commonly reviewed for coils, electrical components, wire assemblies, sensors and compact OEM parts where insulation, fit and component protection must be balanced.

Start with the component minimum and maximum OD, then define the initial tube ID, wall thickness, finished length and heating process.

Wrinkling is commonly caused by oversized initial ID, uneven heat, sharp component geometry changes, trapped air or the wrong shrink sequence.

Heat guns, ovens, shrink tunnels and coil heaters may be used depending on tube size, component geometry and required appearance.

In purchasing language, the terms may overlap. In engineering specification, confirm the film source, tube construction, shrink behavior and finished-tube requirements.

Provide application, component OD range, initial tube ID, wall thickness, length, heating method, operating temperature, assembly method and annual quantity.

No. Use the full minimum and maximum component OD. The maximum OD controls installation clearance before heating, while the minimum OD helps determine whether the tube can recover tightly enough. Tolerance, profile changes and the heating method also affect the starting size.

Select heat shrink Mylar tube from the complete component dimensions, operating conditions, manufacturing process and acceptance criteria. Use samples to confirm fit and function before volume production

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