Static electricity buildup

While with-in the mobile x-ray system, the waste in the sampler, is contained within a replaceable (and disposable) polyvinyl chloride (PVC) sleeve with a wall thickness of approximately 0.2-inches and a sealed bottom. It was anticipated that the PVC tube or sleeve would, with use, become highly contaminated with waste residues which drip of fall-off the sampler. The sleeve is coated with a conductive coating to prevent static electricity buildup . There are no sources of ignition in this sealed spare. The sampler (and waste) is coupling which includes a positive pressure gasket. This barrier is further isolated by a second barrier consisting of an epoxy coated aluminum sleeve also sealed-off from the main x-ray cabinet and PVC sleeve. There are also no potential sources of ignition in this isolated secondary space as well. 

Mixing cellulose esters in nonpolar hydrocarbons, such as toluene or xylene, may result in static electricity buildup that can cause a flash fire or explosion. When adding cellulose esters to any flammable Hquid, an inert gas atmosphere should be maintained within the vessel (132). This risk may be reduced by the use of conductive solvents in combination with the hydrocarbon or by use of an antistatic additive. Protective clothing and devices should be provided. 

Cetrimonium chloride is used in hair conditioners, fabric softeners, and antistatic agents for hair and fibers. It makes fabrics and hair less prone to static electricity buildup by making them slightly conductive. 

Modified Surfaces. It is frequently desirable to change the surface of a polymer. Nonpolar surfaces of plastics are characterized by static electricity buildup, non-wetting, poor adhesion, low printability, and poor dyeing. These disadvantages can be overcome by grafting polar vinyl monomers upon the surface by irradiation. A. S. Hoffman describes radiation grafting of polyelectrolytes upon nonpolar surfaces, and A. Chapiro and co-workers discuss radiation grafting of acrylic acid and vinyl pyridene upon Teflon films. 

Since surface preparation is an important factor in the selection of a paint system, the suitability or availability of the surface for specific preparation techniques must be known. In some instances certain types of surface preparation may not be permitted or practical. For example, many companies do not permit open blast cleaning where there is a prevalence of electric motors or hydraulic equipment. Refineries in general do not permit open blast cleaning, or any other method of surface preparation that might result in the possibility of a spark, static electricity buildup, or an explosion hazard. 

One of the causes of dropouts (i.e., the momentary loss of head-to-tape intimacy) is static electricity buildup. The buildup causes dust and dirt particles to attach themselves to the tape surface and cause a lack of head-to-tape intimacy. Antistatic agents are, therefore, added to tape formulations, particularly backcoat formulations. In most cases, carbon black is used for this purpose. 

Has the potential for static electricity buildup been adequately addressed ... 

When used within their temperature limitations, UFs have good electrical properties. They have high dielectric strength, high arc resistance, no tendency to track after arcing, and a low order-power factor. Their electrical properties are not greatly influenced by high humidity, and they resist static electricity buildup. 

The most frequent hazards of static electricity buildup in an operating plant are as follows ... 

All groxmding cables are in place on transfer lines subject to static electricity buildup. 

Identification of potential static electricity buildup areas... 

The heat conductivity of cotton is high, and cotton fabrics feel cool to the touch. Cotton has excellent heat characteristics, and its physical properties are unchanged by heating at 120°C for moderate periods. The electrical resistivity of cotton is low at moderate relative humidities, and the fiber has low static electricity buildup characteristics. 

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