Polished sections polishing cloths

The choice of the ingredients used for mechanical polishing (felt or cloth, alumina powder or diamond paste, etc.) is dictated by the hardness of the metal and its chemical properties. Soft metals (such as gold) are more difficult to polish than hard metals because the polishing material can possibly be buried into the metal and consequently modify the chemical composition of the electrode surface (see Section IV.6). 

Using Texmet (Buehler) or equivalent cloth, and 15-pm diamond paste or oil slurry, or other suitable grinding pad, and a horizontal rotary grinder / polisher, reduce the section to the final desired thickness (quartz at 25 pm has an interference color no higher than medium first-order gray). 

Backpulse Filtration. The polishing filters described in the preceding section rely on filter aids for efficient removal of solids. This is necessary because the pores in the filter cloths are larger than some of the soUds that are to be filtered. It is necessary first to build up a surface that will retain these solids and then sometimes to continue to renew the surface to prevent its blinding with small or compressible particles. At least in principle, the operation might be simplified if the pores in a filter medium could be made reliably smaller than the suspended solids in the feed liquor and yet controlled to... 

Plastic parts containing glass or mineral fibre reinforcements generally cannot be sectioned using a microtome because the fibres tend to break or fall out of the sectioned sample. Such samples must be embedded in epoxy, polyester or acrylic, and polished using silicon carbide papers and diamond impregnated cloths. If morphology is more important than... 

Wax should be applied with your right hand in clockwise strokes and removed with your left hand in counterclockwise strokes— that is, if you re Ralph Macchio in The Karate Kid. For the rest of us, the exact strokes don t matter so much, as long as you use a clean, soft, lint-free cloth. A liquid or soft wax is fine for most washings. If it s been a while, consider a hard or paste wax, which will protect your car longer but will also be more difficult to apply and remove. For the most durable care, go with a polymer preservative. With a soft or liquid wax, apply to the whole car according to the package instructions and then use a lint-free cloth to polish the car clean. With a hard wax, apply to only a small section at a time and then polish clean before the wax sets into an impenetrable veneer. 

The polished sections are prepared by mounting the cut specimen in Bakelite or Lucite plastic and then grinding and polishing one face smooth, using a series of abrasive papers, followed by abrasive powders suspended in water on cloth wheels. 

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