Tubing heavy walls

A reasonably dust-free cabinet stocked with a variety of standard wall tubing, heavy-walled capillary tubing, and rod A ring stand and clamps with woven-glass-covered fingers Surface-mix bench burner for large items... 

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In the Pyrex glass West condenser greater efficiency of cooling is obtained by having a light-walled inner tube and a heavy-walled outer tube with a minimum space between them. 

If it is desired to carry out the combined operations of stirring, refluxing, and addition of a liquid in a stream of gas, the apparatus of Fig. 77, 7, 12, a may be used the side tube for the gas is sealed on to the separatory funnel. For the passage of a gas into a stirred liquid, the aperture carrying the modified separatory funnel may be fitted with the device shown in Fig. 77, 7, 12, 6 the glass rod inside the tube is held in position by a short length of heavy-wall rubber tubing and is employed to clear the lower end of the gas delivery tube, should it become blocked with solid reaction product. 

The swan neck adapter of Fig. II, 56, 12 is useful for distillations as it permits the use of a capillary tube (held in position by a short length of heavy-walled rubber tubing) not sealed to a ground joint. It may also be used for inser tion of a thermometer or a gas-inlet tube in the narrow neck and a reflux condenser into the ground joint this device virtually converts a three-necked into a four-necked flask. Common sizes are cone fil9, 24, 29, or 34 socket 19, 24 or 29. 

Reactions under pressure are usually carried out in an autoclave. However, several simple vessels can be used for reactions at moderate pressure. A heavy walled Pyrex test tube or Kjeldahl flask drawn out and sealed with an oxygen torch makes a suitable container for many Diels-Alder reactions. The tube can be heated in an oil or water bath, but care must be exercised to protect against explosions. At the conclusion of the reaction, the tube is cooled to room temperature, the neck is scratched with a file or carborundum chip, and a hot Pyrex rod is touched to the scratch. A large crack in the neck should result, and the sealed top can be easily knocked off. 

A heavy-walled Pyrex tube with a suitable lip can be sealed with a metal bottle cap and capper available at many hardware stores (Fig. A3.8). This vessel is suitable for reactions at moderate pressure only (for example, benzene heated to 100°). 

The polymer obtained is white, opaque, and tough and has a crystalline melting temperature of265° C. The inherent viscosity (r]ir ) is 1.0—1.2 in 96% sulfuric acid (1.0 % solution, 25° C). In the past, prepolymers were prepared from dry PA salt on a small scale in sealed heavy-walled glass tubes. As these heavy-walled tubes are not safe to handle, they should no longer be used. 

Phoenix, also, is a borosilicate glass made by the British Heat Resisting Glass Co. The linear expansion coefficient (50-450°Q is 3-24 X 10" . Tubing and rod are supplied in a wide range of sizes. The tubing is made with either standard wall or heavy wall. 

Clamp a filter flask to a ringstand. This filter flask, often called a suction flask, is a very heavy-walled flask with a sidearm on the neck. A piece of heavy-walled tubing connects this flask to the water trap (see Fig. 48). 

Heavy wall tubing plain, coloured, striped tubing fabrications for instrumentation automotive push-pull cables industrial and process hydraulics and other fluids. .. Piping liners for glass-lined reactors, stainless steel reactors, glass equipment and mixers... Membranes, filter media, filter bags, cartridges, microfiltration membranes, vents and adsorbent products. .. 

The Carius tube has a short piece (about 4 in.) of heavy-walled tube (8-mm. external diameter) sealed to it. This greatly facilitates subsequent sealing and re-use of the tube. The solution is introduced by means of a funnel with a drawn-out stem. 

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