Vacuum line plastic

Platinum electrodes used in Method 101.4 (Ref 10a, pi) are wires 0,0l6-inch diam, sealed-in-glass, with mercury connections. A magnetic stirrer with plastic- or glass-coated stirring bar is used (See Fig 6) for stirring the liquid in the cell. The cell is emptied by means of a glass suction tube and a suitable trap connected to a vacuum line... 

The Buchner and Hirsch funnels, and the filter flasks and tubes, are available with interchangeable ground glass joints (for example, Fig. 2.43(/)). The Buchner funnel is also available with a screw-thread side-arm for easy attachment via a plastic hose connector to the vacuum line (Bibby Science Products). 

As with most items on a vacuum line that contain mercury, place the Toepler pump in a secondary container that is firmly attached to another surface to contain any mercury that may spill from an accident as well as protect the pump from accidental bumps (see Fig. 7.28). Plastic containers (such as plastic milk cartons) are particularly good because the mercury will not affect plastic. Conversely, mercury may amalgamate with the metals in a metal can, which could destroy any containment capabilities. In addition, it is easier to get mercury out of a plastic container (with smooth walls) than out of a metal one (with a narrow rim). The plastic tub can be glued onto the table with some epoxy. The epoxy will stick better if you roughen up the bottom surface of the plastic container with sandpaper. Because not all epoxies stick to plastic, test the epoxy before assuming that it will hold. 

With vacuum/pressure the conveying action provides double the conveying rates of vacuum alone. Plastic lines are not recommended for conveying lines since static electricity will be generated and will interfere with the movement of plastics. A rather simple and useful test to determine if material is going to be difficult to convey can be used. Take a handful of the plastic and squeeze it firmly. Upon opening your hand, if the lines in your palm are filled with fines, it will be difficult. 

The necessary equipment is a fluorocarbon all-plastic vacuum line such a commercial vacuum line is presented in Figure 1. 

Hydrogen Fluoride Cleavage Use of the All-Plastic Vacuum line... 

Efficient mold cooling also depends on accurate venting. Air trapped between the mold cavity and the plastic will significantly slow down cooling and also could cause problems with the part. Certain molds incorporate vacuum lines to ensure proper contact. 

MultiBlock. In the late eighties, Krchnak and Vagner designed the MultiBlock, the first reaction block for parallel solid-phase synthesis (Figm-e 3.19). The MultiBlock consists of five parts (i) a Teflon block that holds 42 reactors, polypropylene syringes equipped with a plastic (ii) a vacuum adapter that connects each reactor to a vacuum line and allows... 

The valve mounted on the left front leg of the cart is used to control the incoming air supply to the venturi pump if one is used. The two valves on the top shelf of the cart operate as follows The valve on the left connects the vacuum pump directly to the storage tanks. With the valve open you can pull a vacuum on the tanks. After a vacuum has been pulled you close the valve to store the vacuum. The valve on the right opens and closes the vacuum line from the storage tanks to the platen.To form a sheet of plastic, you would open this valve. 

The other approach to the reduction of the power loss to the dielectric material is by reducing the amount used. This is done by replacing part of the dielectric by air, an inert gas, or by vacuum. As examples there are three cable constructions in common use which employ these approaches to minimize dielectric loss. The first is the use of a foamed dielectric PS plastic that is commonly used in either twin lead transmission lines or in coaxial cables used for antenna lead-in wires in the UHF-TV antenna applications. The second system, which is illustrative of several sectional spacers, is used widely in communications cables of the coaxial type to minimize losses to the dielectric by reducing the amount of dielectric material in the cable. 

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