General
Shrink ratio	3:1
Colour	Black
Internal adhesive	thermoplastic
Application range	Electrical engineering, cable processing
Packaging	spool box
Fire resistant properties	very good
Storage	dust-free, orderly
Compatibility	HIS-Service-Station, gas hot air blower CHG900-PA-GY
Availability	available in 6 sizes from 3 mm to 24 mm inner diameter

The HISA-9/3-PO-X-BK heat shrink tube from HellermannTyton is a thin-walled, flexible 3:1 heat shrink tube with integrated inner adhesive, specifically designed for use in electrical engineering and cable processing. It is supplied in a dispenser box that enables dust-free, orderly storage and easy handling. The dispenser box is designed for use with the HIS-Service-Station, supporting work simplification during cable and wire processing. The heat shrink tube is available in black and offers high flexibility and low weight, making it space-saving and easy to process.

Applications
This heat shrink tube is particularly suitable for smaller requirements in electrical engineering, where precise and clean insulation of cables, wires, or connections is required. It is commonly used for marking, protective covering, or connecting cables, especially in applications requiring high mechanical load resistance and protection against external influences. Typical uses include electrical installations, mounting of plug connections, or in industrial electronics.

Functions and Equipment in Detail
The heat shrink tube features a thermoplastic inner adhesive that activates when heated, creating a secure bond between the tube and the underlying cable or wire. This adhesive provides protection against external influences such as moisture, dust, or mechanical stress, as well as strain relief to extend the connection’s service life. The 3:1 shrink ratio allows for broader application, as the tube can be adapted to a wide range of cable diameters, ensuring increased clamping pressure after shrinking.

Technology Explained Simply
When heated with a gas hot air blower or another suitable heating device, the heat shrink tube contracts and conforms to the underlying cable. The inner adhesive melts and forms a dense, adherent layer, improving insulation and mechanical protection. The thin-walled construction ensures the tube remains flexible and can easily be wrapped around cables without occupying excessive space. The black color provides good visibility and is often standard in industrial or electrical applications.

Compatibility and Accessories
The heat shrink tube is supplied in a dispenser box designed for use with the HIS-Service-Station. Compatible accessories include the gas hot air blower CHG900-PA-GY, which can be used for processing the heat shrink tube. Alternatively, the heat shrink tube is also available in transparent version (HISA-9/3-PO-X-CL), which may be useful in applications where visibility of the underlying cable is important.

Installation and Mounting
Installation involves sliding the heat shrink tube onto the cable or wire to be insulated. The tube is then evenly heated using a heating device such as the CHG900-PA-GY until it shrinks and the inner adhesive activates. Processing is best done in a clean environment to avoid contamination that could impair adhesive and protective properties. The dispenser box facilitates pulling off the tube to the desired length.

Operational Advantages
The heat shrink tube offers excellent fire protection properties, making it suitable for applications in electrical installations where safety is a top priority. The combination of flexibility, low weight, and dense bonding via the inner adhesive ensures reliable and long-lasting insulation. Storage in a dispenser box ensures orderly storage and prevents contamination, enhancing processing quality. Availability in various sizes from 3 mm to 24 mm inner diameter enables broad applicability for different cable diameters.