General
Product type	Cold shrink tube
Material	Silicone
Core material	Plastic
Sealing gasket	at both ends
Function	Sealing and insulation
Processing	Pulling out the plastic core
Material composition	EPDM rubber

The 3M cold-shrink sleeve type 8443.4,9 is a silicone sleeve that is pre-stretched at the factory and contains a removable plastic core. It is used for sealing and insulating wire connections, particularly in areas where a permanent, waterproof seal is required. The installation process involves simply positioning the sleeve over the connection and then pulling out the plastic core, causing the ends of the sleeve to shrink and form a tight seal. The sleeve is equipped with sealing bands at both ends, which support the sealing and ensure a secure connection.

Applications
This shrink sleeve is suitable for use in electrical installations, particularly for sealing plug connections, cable terminations, or wire connections in damp or wet environments. It is appropriate for applications requiring permanent sealing against moisture and environmental influences, such as in industrial settings, outdoor installations, or building electrical systems. The special formulation of the silicone material allows for flexible and durable sealing without affecting the mechanical or electrical properties of the connection.

Functions and Features in Detail
The sleeve is made of silicone material known for its elasticity and chemical resistance. Factory pre-stretching and the integrated plastic core enable easy and precise installation. Pulling out the core activates the shrinking of the sleeve ends, creating a tight, waterproof seal. The sealing bands at both ends support the seal and ensure a secure connection. The dimensions of the sleeve and core are designed to cover a wide range of applications without compromising the sealing and insulating properties of the EPDM rubber sleeve.

Technology Explained Simply
The cold-shrink sleeve operates without heating — unlike conventional shrink sleeves that require heat activation. Shrinking occurs through mechanical removal of the plastic core, causing the material to elastically contract. The silicone material is highly resistant to moisture, UV radiation, and temperature fluctuations. The active deformation of the material ensures a permanent seal that maintains its function even under long-term stress. The use of EPDM rubber in the construction enhances chemical resistance and product longevity.

Compatibility and Accessories
The shrink sleeve is suitable for use with various wire connectors and cable terminations. It can be used in combination with other products from the 3M range, especially in systems requiring permanent sealing. The precise fit is ensured by the predefined dimensions of the sleeve and core, resulting in a secure and tight connection.

Installation and Mounting
Installation is carried out in three simple steps: First, the wire connection is prepared. Then, the shrink sleeve is slipped over the connection and positioned. In the final step, the plastic core is pulled out from one end, causing the sleeve ends to shrink and form a tight seal. The process requires no special tools or auxiliary equipment. The sealing bands at both ends provide additional sealing security.

Operational Advantages
The shrink sleeve provides a reliable, permanent seal without requiring additional tools or chemical aids. The installation is simple and quick, reducing mounting time. The silicone material is resistant to environmental influences such as moisture, UV radiation, and temperature fluctuations, increasing the product's lifespan. The permanent seal ensures a secure, maintenance-free connection that maintains its function even under long-term stress. The use of EPDM rubber supports chemical resistance and product longevity.