Teflon foil

Fig. 8.23 Reduction of airborne moulds using the AEROPUR -QA-20 device in a room under standardized conditions. The inner walls of the room were coated with Teflon foil. It had a total volume Vof 58 m, a relative humidity of the air of 50 5%, and a tempera-...

We will describe only the most up-to-date OPLC system. This fully automatie OPLC system allows separation of mixtures on an analytieal and on a semipreparative scale. The fundamental separation proeess oeeurs on a ehromatographie plate (construeted of glass or aluminum foil) with sorbent (Fig. 1) eovered and eom-pressed by a special polyethylene or Teflon foil, pressured by water. In this way, a flat, thin chromatographic column is created. This teehnique also requires a special chromatoplate which is sealed at the edges, which pre-... 

Thin films with a thickness of 50 pm of a commercially available PS-PB-PS triblock copolymer (e.g. from BASF, 74% PS, 26% PB) are prepared by solution casting from a 3% solution in toluene onto TEFLON -foil, which is placed in a precleaned petri-dish. The solvent is slowly evaporated over a period of 2 weeks. Residual solvent is then removed and films are annealed under reduced pressure in a vacuum oven at 120°C (48 h). Finally, the films are removed from the support and are uniaxially stretched at a constant strain rate of 0.1 s 1 beyond the yield point at room temperature. ARM investigations are carried out on prestretched samples that are mechanically clamped or fixated by double-sided sticky tape onto the AFM sample holder. 

Critical Dimensions of Unreflected BeO Systems Fueled by Thin Enriched Uranium Foils, F. A. Kloverslrom, R. M. Deck and A. J. Reyenga (UCRL-L). A series of criti cal. measurements on unreflccied parallelepipeds built of enriched (93.299 uranium foils and BcO blocks have been made for five fuel densities. The object of this program was to provide data for normalization of machine criticality calculations, and.the systems were therefore made clean. The only material present other than BeO and U was a small amount of Teflon (foil coatings) and a steel diaphragm, the effect of which was experimentally determined. 

In order to remove the cast elastomer film from the Teflon support, a strip of Kapton based adhesive tape is fixed at one end of the swollen gel. Kapton is used as it can withstand high temperatures and is stable towards organic solvents. The film is now removed from the support by slowly pulUng the tape. In some cases it is useful to rinse the space between the elastomer film and the Teflon foil with toluene. The elastomer film is fixed at a metal holder and hung vertically. At the lower end of the film a small load, e.g., a paper chp, is attached and held steady with Kapton tape from both sides (Fig. 10). 

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