General
Colour	Black

The Membrane Sleeves DG 21 from Ses-Sterling are rubber sleeves made of polychloroprene rubber, specifically designed for use in electrical and installation technology. The product, type Helavia DG 21 black, serves as cable protection and sealing element when routing cables through wall or ceiling openings. The sleeves ensure a watertight and dust-tight connection, making them particularly suitable for areas with high environmental requirements. The black color is standard, allowing the sleeves to blend discreetly into industrial or technical installations.

Applications
Membrane sleeves DG 21 are used in installation technology, particularly for cable routing through components such as walls, ceilings, or enclosures. They are suitable for use in industrial plants, machine building, electrical installations, and wiring systems, where a durable and secure seal is required. The use of polychloroprene rubber ensures high resistance to weathering, chemical substances, and mechanical stress, making the sleeves suitable for outdoor use or in harsh environments.

Functions and Features in Detail
The sleeves are designed as membrane sleeves, meaning they feature a flexible, elastic membrane that adapts to cable diameters. This enables a secure and tight connection without damaging the cable. The black color is not only aesthetic but also functional, as it is UV-resistant, providing long-term protection against sunlight. The sleeves are available in a pack of 100 pieces, making them particularly cost-effective for large projects or series installations.

Technology Explained Simply
The sleeves are made of polychloroprene rubber, a synthetic elastomer known for its high flexibility, weather resistance, and chemical resistance. This material quality ensures that the sleeves maintain their sealing function even under prolonged stress. The membrane structure allows elastic adaptation to different cable diameters, ensuring a tight but non-damaging encasement of the cable. The black color is part of the material composition and not an additional coating or paint, enhancing durability.

Compatibility and Accessories
The Membrane Sleeves DG 21 are universally applicable and compatible with various cable types, provided their diameter falls within the technical specifications of the sleeves. They can be used in combination with other protective sleeves, cable glands, or sealing elements to create a complete and secure wiring solution. Typical use includes combination with cable protection conduits or enclosure openings, where the sleeves provide the seal between the cable and the component.

Installation and Mounting
Installation is performed by simply inserting the cable into the sleeve and then sliding the sleeve into the opening. The elastic membrane automatically adapts to the cable diameter, forming a tight seal. No additional tools are required, as the sleeves create a self-sealing connection due to their material properties. Installation typically does not require additional adhesives or sealing compounds, as the membrane structure provides sufficient sealing.

Operational Advantages
The Membrane Sleeves DG 21 offer a reliable and durable seal that remains stable even under difficult environmental conditions. The resistance to weathering and chemical substances ensures a long service life. The elastic adaptation to different cable diameters reduces the risk of cable damage and allows for flexible use. The black color ensures discreet integration into technical installations, making the sleeves both functionally and visually compatible with the environment. The pack of 100 pieces simplifies planning and procurement for larger projects.