How Temperature Changes Affect High Damping Rubber Bearings – A Simple Comparison Based on EN15129 and GB/T 20688.1 Abstract High Damping Rubber Bearings (HDRB) are widely used in bridges and buildings to resist earthquakes. Most standard tests, such as EN15129 and GB/T 20688.1

Water tightness testing on large-diameter pipelines—especially those above 1500 mm—faces two critical challenges. First, maintaining a stable seal across a wide diameter range. Second, withstanding high hydrostatic backpressure without blowout or leakage.

High Damping Rubber Bearings (HDRB) are seismic isolation devices that provide stable energy dissipation capacity without the need for a lead core. This article systematically introduces the working principle, mechanical characteristics, and design process of HDRB from an engineering perspective,

PTFE laminated bridge bearings solve this problem by adding a sliding interface to a reinforced elastomeric bearing. A thin sheet (1.5–3 mm) of polytetrafluoroethylene (PTFE) — the same low friction material used in non stick cookware — is bonded to the rubber. When pressed against a mirror finished stainless steel plate.