Full definition
Neoprene pads are flat pieces cut or die-stamped from solid neoprene (CR) rubber sheets, utilized in various industrial applications due to their excellent mechanical properties and resistance to environmental factors. The most critical role of neoprene pads is in structural bridge bearing applications, where they provide support and accommodate thermal expansion, movement, and rotation of bridge components. According to AASHTO M 251, these pads are classified into Type A for unreinforced pads and Type B for laminated pads with steel plates, ensuring that the specification matches the demands of the structural application. The hardness of neoprene pads used in this context typically ranges from 50 to 60 Shore A, with a minimum tensile strength of 17 MPa, and a maximum compression set of 25% when subjected to 70 hours at 100°C. Additionally, their ozone resistance is verified per ASTM D1149, distinguishing neoprene from natural rubber (NR) due to its superior durability against weathering and environmental degradation.
Beyond bridge bearings, neoprene pads serve various functions in industrial settings. They are commonly employed as vibration isolators in machinery mounts, where the natural frequency is determined by the pad's stiffness, area, and thickness. This application helps reduce the transmission of vibrations and noise generated by equipment, enhancing operational efficiency and longevity. Other notable uses include anti-vibration pads for shipping containers, weatherproof gaskets for equipment, transformer pads for electrical installations, and isolation pads for HVAC systems. Neoprene pads can be manufactured in a range of sizes, from compact 25×25 mm equipment pads to larger 600×600 mm bridge bearings, with thicknesses varying from 6 mm to 150 mm. Laminated bearings, designed for heavy-duty applications, can be significantly thicker due to the incorporation of internal steel plates, providing added strength and stability in demanding environments.