The standard outlines specifications and dimensional details for PVC handrail covers intended to fit metal strip handrails. It includes material characteristics such as tensile strength, elongation, surface hardness, combustion resistance, and installation as well as marking procedures. This guideline is crucial for manufacturers, engineers, and contractors to ensure the production and installation of safe, durable, and compliant PVC handrail coverings in construction.
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The standard outlines specifications and dimensional details for PVC handrail covers intended to fit metal strip handrails. It includes material characteristics such as tensile strength, elongation, surface hardness, combustion resistance, and installation as well as marking procedures. This guideline is crucial for manufacturers, engineers, and contractors to ensure the production and installation of safe, durable, and compliant PVC handrail coverings in construction.
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The specifications outline dimensions and tolerances for PVC handrail covers designed to fit metallic strips of widths 25, 40, 50, and 65 mm. Key dimensions include width (A) with a tolerance of ±1 mm, thickness (B) typically 5 mm with +1/-0 mm tolerance (6 mm thickness for certain flats), minimum clearance (C), and height (D) with a tolerance of +2 mm. These ensure a proper fit and comfortable grip as per the standard requirements.
PVC handrail covers should satisfy mechanical property benchmarks including a minimum tensile strength of 10 N/mm², elongation at break not less than 115%, and a Rockwell surface hardness of at least 65. Additionally, they must demonstrate no plasticizer exudation or visual changes upon heat aging and must resist combustion such that no flame or afterglow persists beyond 5 seconds after flame removal, and burning does not extend past 25 mm.
Surface hardness testing is conducted using the Rockwell hardness method specified in the standard's annex. Samples are conditioned under controlled temperature and humidity, then tested using a defined minor and major load sequence with a precise indentor. The hardness value is recorded 15 seconds after removing the major load, ensuring the surface resists indentation adequately, with a minimum acceptable hardness number of 65.
Installation involves selecting PVC covers matching the metallic handrail widths to ensure a snug and ergonomic fit. The metal strips should be clean, properly welded, smooth, and free from contaminants. PVC covers are slid onto the metal flats from top to bottom carefully to avoid damage or deformation. Ends allow a 20-30 mm margin for thermal contraction, which is trimmed and welded using hot metal plates. Post-installation cleaning with solvents and polishing ensures a neat finish.
Yes, the standard advises using black-colored PVC handrail covers for exterior installations due to their superior UV resistance and reduced fading. For interior environments, bright or varied colors can be used since they are not exposed to weathering effects, allowing for aesthetic customization without compromising durability.
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