For medical and industrial filtration. Porous, polycarbonate film is penetrated with uniform cylindrical holes for sieve-like filtering. Suitable for critical cytologic diagnosis, culture preparations and large volume applications. Other specific applications include: water testing, chemical assay, aerospace fluid analysis, petroleum products analysis, solvent filtration and bacteria monitoring. In cytologic tests, Nuclepore gently removes virtually all cells of interest from body fluid, concentrating them in a single microscopic viewing plane. Fast-flow filtration passes fluids quickly, eliminating clogging and morphologic detail. Chemically-resistant plastic surface is unaffected by most solutions used for fixation and staining. Nuclepore filters withstand sustained temperatures up to 140°C with no adverse effects. Birefringent refractive index of 1.623 and 1.585.