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Materials used in the splice box

Fiber and communications infrastructure knowledge brief Published 07 Sep 2025

Prepared for preliminary research by the ROGER FIBRE knowledge desk. Confirm optical interfaces, port or core capacity, electrical input and output, enclosure protection, thermal design and installation limits against current standards and product documentation.

Splice boxes are typically made from metallic, non-metallic, or composite materials, each chosen for durability, corrosion resistance, and suitability for specific environments.

Metallic Materials

Metallic splice boxes are commonly constructed from steel or aluminum. Steel offers high strength, durability, and affordability, making it ideal for commercial and industrial applications, while aluminum provides a lightweight, corrosion-resistant alternative suitable for aerial or outdoor installations. Some splice enclosures, like AFL's SB01, use iron and steel construction to provide robust protection against environmental hazards and physical impacts without additional coverings.

Metal housings are also used in rail-mountable splice boxes for fiber optics, offering IP20 protection and secure splicing.

Non-

Metallic MaterialsNon-metallic splice boxes include plastics and fiberglass, which are valued for their corrosion resistance, chemical resistance, and electrical insulation. Plastic splice boxes are lightweight, cost-effective, and easy to install, while fiberglass boxes provide mechanical strength and resistance to harsh chemicals, making them suitable for environments where electrical isolation or chemical exposure is a concern. Fiber optic splice trays often use high-impact Lexan®, a durable plastic, to manage fibers safely within the enclosure.

Composite Materials

Composite splice boxes combine different materials to achieve enhanced strength, reduced weight, and improved corrosion resistance. These are particularly useful in harsh environments where durability and resistance to degradation are critical. Composite enclosures can be tailored for both electrical and fiber optic applications, providing a balance between mechanical protection and environmental resilience.

Summary

The choice of splice box material depends on the installation environment, mechanical protection requirements, and electrical insulation needs. Metallic boxes are preferred for strength and durability, non-metallic boxes for corrosion resistance and insulation, and composite boxes for specialized applications requiring a combination of properties. Understanding these material options ensures the reliability and longevity of electrical and fiber optic systems.

Materials used in the splice box - ROGER FIBRE ATELIER [PDF]

Materials used in the splice box

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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