Heat shrink tube HellermannTyton 323-20630, black, length 1 m, diameter 6.3–19 mm, pack of 6

Heat shrink tube HellermannTyton 323-20630 is a black, polyolefin-based insulation sleeve supplied as a pack of six 1 m lengths. Designed to provide protective insulation, strain relief and environmental sealing for wiring, connectors and splices, this shrink tube reduces its diameter from 19 mm to approximately 6.3 mm when heated, forming a tight, durable cover around cables and components used in industrial and installation environments.

Advantages

The tube offers reliable electrical insulation and mechanical protection for single cables and bundled conductors. Its heat-shrink behaviour creates a close-fitting layer that improves strain relief at connection points and helps prevent moisture and corrosion ingress. Supplied in multiple 1 m pieces, the pack format reduces waste and supports flexible planning of on-site repair or installation jobs. The black colour provides discrete visual integration into existing cable runs.

Suitable for

• Insulating individual wires and multi-core cable joints
• Protecting connectors, terminals and soldered splices
• Providing strain relief at cable exit points
• Environmental sealing against moisture and dust in installations
• Bundling and repair of power and signal cables in industrial equipment

Key specifications

• Material: cross-linked polyolefin (heat-shrinkable)
• Colour: black
• Pack quantity: 6 pieces
• Length per piece: 1 m
• Recovered inner diameter range: approximately 6.3 mm (minimum) to 19 mm (maximum before shrinkage)
• Shrink ratio: designed to reduce from the larger supplied diameter to the smaller recovered diameter when heated
• Typical uses: electrical insulation, mechanical protection, corrosion resistance

How to use

Cut a length of tube sufficient to cover the area to be protected with some overlap. Slide the tube over the cable, connector or splice, then apply even heat using a heat gun or controlled heat source until the tube uniformly conforms to the underlying surface and the diameter reduces to form a tight seal. Allow the tube to cool before handling. Follow standard safety practices when working with heated tools and live circuits: isolate power where possible and verify the compatibility of the shrink material with your application.

Recommendations

For best results, select a tube length that permits 5–10 mm overlap beyond the protected area. Use a regulated heat gun at appropriate temperature settings for polyolefin materials to avoid overheating. When insulating critical or high-voltage connections, ensure the recovered wall thickness and dielectric properties meet your application requirements and consult applicable standards or technical datasheets where necessary.