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This patent describes a pump for liquid chromatography applications. It is specifically designed to operate without lubricants that could cause contamination of the samples. The seals described are designed to run without lubricant and prevent cross contamination of samples. They are spring energised plastic Urings, typically with a wiper type of lip, but all with two energiser springs. Both flanged seals, as often used for rotary applications, and non flanged seals are described. A range of detail variations in geometry are illustrated.
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A thermoplastic elastomer material for the manufacture of seals in pharmaceutical dispensing devices is described. It is formed from a blend including a propylene component with isotactic crystallinity; and one or more polymer of polypropylene, polyethylene or their copolymers.
## PATENTS differential unit. The setting of the joint with shims will cause variable loading on a conventional O-ring or gasket. The gasket has tubular sections which align with the oil-feed passages in the components of the axle. The flange of the gasket (43) can have a thickness, and compressib