Hardening, Tempering and Heat Treatment (Workshop Practice) by George Gently

By George Gently

A entire exposition of the constitution of steels and the results of other warmth remedies, relatively in appreciate of instruments. It comprises strong gas, gasoline and electrical furnaces, case hardening, tempering and different sensible details. positive factors actual color temperature charts.

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Hardening, Tempering and Heat Treatment (Workshop Practice)

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While more expensive than regular molded disposables, MSA's Affinity® Ultra N95 respirators (available from Lab Safety Supply; see Sources of Supply on p. 1 9 5 ) are more comfortable and offer a more positive seal. C H ECKING THE FIT Choose the Right Mask S ize A lthough a typical mediu m-size mask fits about 90 percent of the population, well-stocked suppliers carry masks in small, med i u m , and large sizes. Some brands of dispos­ able mask also come in more than one size. One b rand might fit you better than another, so you might want to try out several models and b rands before choosing a mask for everyday use.

Screw-in cartridges not only make it easy to replace filters but also allow you to change the kind of respiratory protec­ tion that the mask provides. There are literally dozens of different kinds of filters that are effective against dusts, mists, vapors, gases, chemicals, and various combinations of these materials (see pp. 45-47 ) . The availability of different kinds of filters makes respirators versatile, since you use one facepiece with separate cartridges for dust and organic vapors, enabling you to use the respirator as both a dust mask and a spray-finishing mask.

Pirator at right in the same photo) . Screw-in cartridges not only make it easy to replace filters but also allow you to change the kind of respiratory protec­ tion that the mask provides. There are literally dozens of different kinds of filters that are effective against dusts, mists, vapors, gases, chemicals, and various combinations of these materials (see pp. 45-47 ) . The availability of different kinds of filters makes respirators versatile, since you use one facepiece with separate cartridges for dust and organic vapors, enabling you to use the respirator as both a dust mask and a spray-finishing mask.

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