Neoprene adapters

AccessChrom or TurboChrom data acquisition software running on a MicroVax Adapters, neoprene Adapters, reducing... 

This can be conveniently done by cutting a hole - in. larger than the mouth of the filtering flask in the bottom of a half-pound coffee can, and having placed this can on the flask, securing the neoprene adapter and crucible, and packing the can with ice. 

With a thermometer clamp, securely clamp a thermometer and lower it into the test tube through a neoprene adapter. Adjust the thermometer so that it is approximately 1 cm above the surface of the unknown liquid. 

The Buchner funnel is inserted into the filter flask through either a filtervac, a neoprene adapter, or a one-hole rubber stopper, whichever is available. Filter paper is then placed into the Buchner funnel. Be sure that the paper lies flat and covers all the holes. Wet the filter paper with water. 

Upon completion of fermentation add 10 g of Celite filter acid (diatomaceous earth, face powder) to the flask, shake vigorously, and filter. Use a 5.5-cm Buchner funnel placed on a neoprene adapter or Filtervac atop a 500-mL filter flask that is attached to the water aspirator through a trap by vacuum tubing (Fig. 2). Since the apparatus is top-heavy, clamp the flask to a ring stand. Moisten the filter paper with water and apply gentle... 

The funnels are commonly held in the filter flasks by rubber stoppers. However, tapered neoprene adapters are much more convenient and may be used with any size funneL... 

Neoprene adapter, 70-watt Wilkens-Anderson hot plate)... 

The apparatus is shown in Technique 12, Figure 12.14. Insert a No. 1 neoprene adapter inside a No. 2 neoprene adapter and place both adapters in the top of a 50-mL filter flask. Clamp the flask securely and then apply a vacuum source. Place the SPE column inside the No. 1 neoprene adapter and condition the column under vacuum in the following way. Add 2 mL of methanol to the column, 1 mL at a time. Wait for the methanol to draw through the column completely before adding the second mL. Next, add 2 mL of room-temperature de-ionized (Dl) water, 1 mL at a time. Proceed to the next step as quickly as possible. Don t let the column dry out. 

The Buchner funnel, which is shown in Figure 8.5C, operates on the same principle as the Hirsch funnel, but it is usually larger, and its sides are vertical rather than sloped. It is sealed to the filter flask with a rubber stopper or a Neoprene adapter. In the Buchner funnel, the filter paper must also cover all the holes in the bottom but must not extend up the sides. 

Use of the Hirsch Funnel. The standard filtration system for collecting products purified by recrystallization in the microscale laboratory is vacuum (suction) ffltration with an 11-mm Hirsch funnel. Many reaction products that do not require recrystallization can also be collected directly by vacuum filtration. The Hirsch funnel (Fig.5.23a) is composed of a ceramic cone with a circular flat bed perforated with small holes. The diameter of the bed is covered by a flat piece of filter paper of the same diameter. The funnel is sealed into a filter flask with a Neoprene adapter (Fig. 5.23b). Plastic and glass varieties of this funnel that have a polyethylene or glass frit are now available. It is stfll advisable to use the filter paper disk with these funnels to prevent the frit from clogging or becoming discolored. Regardless of the type of fflter used, always wet the filter paper disk with the solvent being used in the crystallization and then apply the vacuum. This ensures that the filter paper disk is firmly seated on the bed of the filter. 

Neoprenes. Of the synthetic latices, a type that can be processed similarly to natural mbber latex and is adaptable to dipped product manufacture, is neoprene (polychloroprene). Neoprene latices exhibit poor initial wet gel strength, particularly in coagulant dipped work, but the end products can be made with high gum tensile strength, oil and aUphatic solvent resistance, good aging properties, and flame resistance. There are several types of neoprene latex, available at moderately high (ca 50 wt %) and medium soHds content. Differences in composition between the types include the polymer s microstmcture, eg, gel or sol, the type of stablizer, and the total soHds content (Table 22). 

Equipment for Unloading Tank Cars and Tank Trucks. The unloading of tank cars, isotankers, or trucks requires fittings and adapters to connect the unloading line to the tank car, isotanker, or tank outlet. Tank cars generally require 10 cm (4-inch) outlets, whereas 7.6 cm (3-inch) outlets are standard for tank trucks. Flexible hoses made from carbon steel, neoprene, plastic, aluminum, or stainless steel (types 302, 303, 316) are suitable. 

Neoprene, or polychloroprene, is a synthetic rubber discovered by the Du Pont Company in 1931. It is an organic polymer composed of carbon, hydrogen, and chlorine in the ratio of 55 5 40. Its relatively high chlorine content was responsible for the early recognized resistance of the polymer to burning. Practical use of this property was not developed until procedures for making foam structures from neoprene latex were developed in the 1940 s. The U.S. Navy adapted the material to make neoprene foam mattresses that reduced the fire hazards in the crews quarters of naval vessels. For many years neoprene has been the only material to meet Navy specifications for this application. 

Figure 9. Multiport sedimentation column (nylon swaglok fittings adapted to take Neoprene septums were used as sampling ports)...

Figure 12 Exploiting a vacuum inlet for flash column chromatography inside a glovebox. The tip of the column is fitted with neoprene filter adapters in order to have a good seal with a standard filter flask. With plenty of solvent on the column and in reserve, a controlled vacuum is then applied to the filter flask in order to rapidly elute the various fractions.

Elastomeric 1, Natural rubber. 2, Neoprene. 3, Nitrile. 4, Urethane. 5, Styrene-butadiene. Thermoplastic 6, Poly(vinyl acetate). 7, Polyamide. Thermosetting 8, Phenol-formaldehyde. 9, Resorcinol, Phenol-resorcinol/formaldehyde. 10, Epoxy. 11, urea-formaldehyde. Resin 12, Phenolic-poly(vinyl butyral). 13, Polyeser. Other 14, Cyanoacrylate. 15, Solvent. Source Adapted from O Rinda Trauernicht, J. 1970. Plastics Technology, Reinhold Publishing, New York. 

The Gehring Textiles Inc./Militex Inc., New York, produces the so-called Spacer Fabric for diving suits as an alternative to neoprene. Furthermore, a possible development has been reported in the field of yams and stmctures, where in addition to the aesthetic properties, technical properties are also improved. This includes strength, ductility, density and elasticity, which have to be adapted to the requirements of the suit (Anon., 2002a,c, 2003a,b Gehring Textiles, 2013). 

Seal manufactures develop their own rubber compounds suitable for seals, which possess the chemical, physical and swelling properties to match the functional requirements and working conditions of the application. The compounds used in the manufacture of seals are derived from base rubbers such as natural rubber, nitriles, neoprenes, butyls, styrene butadiene, carboxylated nitriles, viton, silicones and polytetrafluoroethylene. Of all the properties exhibited by the various types of rubber compounds, the most critical ones pertain to how they change when they are installed as seals and while in service. All physical properties change with age, and exposure to variations in temperature, fluid type, pressure, and other factors which can include corrosive chemicals and fumes and gases. Compounds with the smallest tendency to change their properties, whether chemical or physical, are easier to work with. More adaptable and versatile seals can be produced with these compounds. 

The face of the basic Class I unit can be adapted for different operations. A panel containing arm ports can be fitted to some models, and certain of these can be provided with arm-length neoprene gloves (see Figure 9.4). This latter adaptation converts the cabinet into a glove box, but it does not make the Class I cabinet into a Class III unit. These adaptations will, however, reduce the chance of product contamination while increasing operator protection. 

Coated work gloves consist of a fabric layer made of knitted or woven cotton, wool or synthetic blends coated with materials such as mbber, PVC, polyurethane, nitrile or neoprene. Although the concept is simple, the many variables available are what make the coated work glove adaptable to hundreds of different types of tasks and environments. 

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