Scientific Alloys 95-5 precision spheres are used as regeneration material or matrix in regenerators, G-M Cryocoolers, second-stage displacers, and vacuum pumps, when the desired temperature ranges are above 10 K. Our packing media works wonderfully with liquid helium to minimize pressure drop in oscillatory flow within these cryogenic environments. PbSb precision spheres are an extremely effective heat storage material due to their uniformity in shape and size. They are completely superior to irregularly shaped regeneration materials. When it comes to heat absorption capability, shape makes all the difference, and our spheres maximize surface area. We produce a number of standard sizes but can accommodate any custom application, producing spheres .008” +/-.001” (.20 mm +/- .02mm) or lower.