Heat-shrinkable boots for sealing, insulation and strain relief

In the world of cable management, ensuring the longevity and reliability of electrical systems is paramount. Heat-shrinkable boots - also known as moulded shapes, heat shrink breakout boots or strain relief boots - are engineered to insulate and protect cable terminations and connectors from environmental and mechanical stress, as well as electrical hazards. 

Strain relief boots are made from a specialised polymer that shrinks when heated, forming a tight, secure fit. Their benefits include: 

• Airtight seal that resists moisture, chemicals, abrasion, and UV damage 
• Durability in extreme or harsh environments 
• Reliable protection for sensitive cable areas 

HellermannTyton's heat shrink breakout boots are designed to meet the stringent requirements of military applications and comply with relevant military and aerospace standards (VG, MIL). Our heat-shrinkable shapes (HSS) come in a variety of shapes and sizes: Some are designed for straight connections, while others are ideal for multi-way branching or specialised terminations. 

Straight heat shrink boots are one of the most used types in cable protection. These breakout boots are typically used to provide an insulating cover for single cable terminations. Their straightforward design makes them simple to apply and highly effective at protecting cables from external elements, moisture, dust, and mechanical wear. 

Key benefits of straight heat-shrinkable boots: 

• Snug, secure fit around single cable terminations 
• Available in various diameters to accommodate different cable sizes 
• Excellent electrical insulation properties 
• Quick and easy application with a heat gun 

Multi-way heat-shrinkable boots are designed for applications where multiple cables need to be branched out from a single termination point. These heat shrink breakout boots come in a range of configurations, HellermannTyton offers Y boots and 3-way to 6-way strain relief boots, allowing for versatile protection of multiple cables at once. They are ideal for situations where space is limited, but the need for robust insulation and protection of complex cable networks is critical. 

These heat-shrinkable boots feature multiple outlets that shrink to form tight, secure seals around each individual cable. They are especially useful in applications like wiring harnesses, power distribution systems, and complex industrial machinery and therefore commonly used in the automotive, defence and aerospace industries. 

T-shaped heat-shrinkable boots offer a specialised design for applications where a T junction between cables needs protection. These breakout boots are commonly used when one cable is branching into two or more cables. They are ideal for situations where cables split off from a central core and require additional protection at the split point. 

T heat shrink boots are widely used in the automotive, telecommunications, end electrical industries. Also among the HellermannTyton portfolio: double T moulded shapes.  

Bulbous heat shrinkable boots are designed with a larger, bulging section that provides extra protection and strain relief. This type of moulded shape is typically used at points where the cable may experience excessive mechanical stress or where extra durability is needed. The bulbous section creates a thicker layer of insulation and protection, ideal for locations that are more susceptible to wear, tension, or flexing. 

Bulbous heat shrink boots are ideal for applications like power cables, heavy machinery, and any scenario where cables are subject to frequent movement, high vibrations, or extreme environments. The added thickness in the bulbous area helps to absorb stress and prevent damage to the cable's core, offering a long-lasting and reliable protective solution. 

Heat shrink boots are essential components in various industrial applications, particularly in the defence, aerospace, and automotive sectors. Made from thermoplastic materials, these moulded shapes shrink tightly around objects when heated, providing superior environmental sealing. HellermannTyton heat-shrinkable boots can achieve IP69K ratings and are designed to withstand harsh temperatures and exposure to a wide range of industrial fluids. 

Industry applications: 

• Aerospace: Protecting electrical systems at varying altitudes and extreme temperatures 
• Automotive: Ensuring durability in harsh engine compartment conditions 
• Rail and marine: Providing resistance to vibration, moisture, and saltwater corrosion 
• Defence: Meeting stringent military and aerospace standards (VG, MIL) for maximum resilience 

HellermannTyton heat-shrinkable boots adhere to the highest quality and regulatory standards, ensuring critical systems remain functional even in these tough environments. Our experts offer full support from design and prototyping to production and after-sales service.  

In this brochure, you will find additional tables listing adhesive combinations and available product series, among other things. It also provides detailed information on technical properties and chemical resistance. Furthermore, the brochure includes an overview of specialised components as well as details on the strain relief boot options.