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These remarkable springs, based on a brass alloy, 'remember' to open up when heated and close again when cool. If immersed in hot water at or around 90°C they will open in a split second and close as quickly if dropped in cold water. Such springs have many industrial applications – e.g. in sprinkler and fire damping systems where they replace expensive single-use only fusible links. The spring is 10mm long, extending to 25mm in hot water. 11.5mm external diameter. 9mm internal diameter . Spring weight 3g
