Abstract: Provided is a local polishing technique suitable for corrective polishing. Press polishing is performed while supplying a polishing solution between a work and a work-polishing rotating tool locally pressed against the work, the polishing solution having abrasive grains composed of organic particles with an average particle size of 5 ?m or more dispersed in a liquid. The rotating tool is made of an elastic material.

Abstract: A flexible, non-porous tube characterized by the fact that the void spaces present in the luminal surface of a substrate tube of porous polytetrafluoroethylene are filled with a silicone or fluorosilicone rubber, that a continuous coating of said silicone or fluorosilicone rubber is not present on the inner surface of said tube, and that the inner surface of said tube incorporates surfaces of both the polytetrafluoroethylene and the silicone or fluorosilicone rubber. The tube has excellent lubricity, resistance to contamination, resistance to chemicals, and has exceptional tube flexing properties. The flexible tube may be employed, for example, as a tube for removal of gas destructively tested by a gas sensor, as a tube for transporting various liquids, and particularly as a tube in medical applications, such as a forceps channel tube, an endoscope channel tube, a bodily fluid transport tube, catheter tube, or the like. A method of making the tube is also described.

Abstract: A system for adjustably locating a lens (16, 18) as a function of the temperature of the lens, comprising a housing (12) and a lens mount (14) which is movable in an aperture in said housing in an axial direction, the lens being mounted in the lens mount. An axially extending chamber is defined between a radial surface of a radially extending portion (34) of the housing and a radial surface (32) of a radially extending portion (22) of the lens mount. A fluid is accommodated in the chamber, the fluid having variable volume as a function of temperature, such that the distance between the two radial surfaces, and thereby the location of the lens, is variable as a function of the temperature of the fluid.

Abstract: Pyrogen-free collagen useful for manufacturing soft contact lenses is made by performing all manufacturing process steps under aseptic conditions.