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Shrink caps

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Heat Shrinkable Caps

Heat Shrinkable Caps are used for sealing and protection of any cable endings and terminations. They can be used for securing screws in various types of connections, e.g. in fixing lighting pole bases, steel structures of various halls and bridge engineering objects. They are perfect as insulation caps in the protection of electrical, telecommunications and power engineering cable ends during transport and storage.

Heat Shrinkable Caps - Versatility

The heat shrinkable properties of polymeric materials are based on the change of their structure and elasticity under the influence of temperature to a non-acting one. This feature is commonly used to protect and secure all types of cabling connections. Starting from simple heat shrinkable sleeves used in electronics, automotive electrics and home and workshop installations, through fittings and caps for cable insulation, to elbows and splitters of various types in military and industrial applications. The polymers used in these products have the ability to shrink the insulated and protected end or section of the cable. This is achieved by crosslinking the polymer. This is a characteristic of the product obtained by irradiating the material during the production phase. Depending on the degree of cross-linking, thermoplastics can be made into gels, rubbers or products with different degrees of intermolecular density. This degree is responsible for the final hardness and stiffness of the shrunk material. In addition to the high degree of mechanical resistance obtained in this way, polymers do not absorb or allow the passage of fungi and mold.

Properties of polymers and their use

Shrink sleeves usually have a cross-linking level of 3:1 or 2:1 and a shrink ratio of 20 to 50%. This allows for a wide range of applications and makes sizing easier. The normal operating temperature range for insulation caps is -50 to +105 degrees Celsius. This provides flexible and reliable protection no matter where they are used. For electrical insulating applications, we typically use radiation crosslinked polyethylene, which has a shrink temperature between 120 degrees and 200 degrees Celsius. The polymers exhibit UL94 safety standards for flame retardance and non-spread flame retardance appropriate to the product class. Insulation caps and other fittings in selected variants have an adhesive layer applied on the inside, which provides additional protection against the ingress of moisture and other materials that cause contamination and corrosion.

Protective caps intended use

Heat shrinkable caps are often used in warehouses and electrical supply stores to protect cables of all types, in the wind and solar power industry as well as the railway and armaments industries. They provide protection for cut cables against dust, moisture and consequently corrosion penetrating the insulation. The range of diameters available before shrinking is from a few millimetres to over 300 millimetres, which gives them a wide application and usefulness. Average insulation caps have a wall thickness of 1 millimetre to 5.5 millimetres. This provides both adequate strength and flexibility of protection. The designation KTM is typical for products designed to protect screws of various types, and KTK for cable and wire terminations. In addition to these, there are also such symbols as: TZK, EC, SKH and PK used in places according to detailed product specifications. The admixture of UV resistant materials and the black colour of the caps ensures their resistance to sunlight and ageing.

Heat Shrinkable Fittings

In demanding locations, heat shrinkable fittings are used to secure and protect various non-standard connections and joints. In bottled, straight or angled form, they provide a tight and stable connection, for example, plugs and connectors of various types and industrial and control equipment in the aerospace, marine or military industries. Insulation caps in the form of several finger-shaped heat shrink manifolds, T- or Y-shapes in many sizes allow a safe branching of wires of all types.