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Metallic Abrasives

Metallic Abrasives-Shot & Grit Abrasives The abrasive blasting materials is important because they determine the surface profile produced. Metallic  abrasives (shot & grit) are used primarily to blast clean steel and forged or cast iron where a surface profile is seldom critical on the finished product. Some examples of metallic abrasives include: Cast steel is a hard metallic abrasive used to remove scale and other hard surface deposits. Steel grit abrasives have irregular shapes and are effective in cutting away surface deposits or imperfections. Steel grit is expensive and is generally used only in recycling systems and when cheaper abrasives are unavailable. Because steel grit can be recycled, it reduces the overall waste stream. Steel shot is spherical; it can be produced accidentally as a byproduct or intention-ally for blast cleaning. Steel shot is good for heavy brittle deposits. Because of its spherical shape, it ricochets in enclosed areas and causes […]

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Alternative Surface Preparation Methods

Alternative Surface Preparation Methods There are alternatives to traditional abrasive blast cleaning methods that may reduce surface preparation costs, dust, or fouling of machinery by small abrasive particles. These alternative surface preparation methods, unless otherwise noted, assume an existing surface (anchor) profile on the substrate surface does exist. If a surface profile does not exist, or new material requires a deeper profile, traditional abrasive blast cleaning must be employed. Alternative surface preparation methods include soda and ice blasting,sponge blasting and chemical strippers. Sponge Abrasive Blasting Sponge blasting is one of the alternative surface preparation methods that follows the traditional abrasive blast methods, except that the abrasive particles are encapsulated in a sponge material. The sponge material prevents abrasive particles from breaking up and diffusing on impact, thus reducing the amount of dust. Sponge blasting creates about 10 to 20 percent of the dust that would be created by non-capsulated abrasive materials. […]

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Abrasive Blasting Materials

Abrasive Blasting Materials-Metallic & Nonmetallic Abrasives The abrasive blasting materials are important because they determine the surface profile produced. There are two general categories of abrasives: metallic and nonmetallic. Metallic abrasives are used primarily to blast clean steel and forged or cast iron where a surface profile is seldom critical on the finished product. Nonmetallic abrasives, depending on the type used, can produce the desired surface profile and cleanliness on hard, dense ferrous metals or on soft metals (aluminum, brass, bronze, or copper) without damaging or altering the metal surface. Metallic Abrasives Metallic abrasives include cast iron shot, cast iron grit, and steel shot. Cast iron shot is hard and brittle and is produced by spraying molten cast iron into a water bath. Cast iron grit is produced by crushing oversized and irregular particles formed during the manufacture of cast iron shot. Steel shot is produced by blowing molten steel. […]

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Surface Preparation Standards

Surface Preparation Standards In every painting job, the manufacturer of the coatings specifies surface preparation standards for a minimum degree of surface preparation for the substrates that will accept the coatings. Below is a short description of the basic widely used surface preparation standards which a number of them where developed under a joint effort of the Society of Protective Coatings (SSPC) and the National Association of Corrosion Engineers (NACE). NACE/SSPC surface preparation standards include: SSPC-SP1 Solvent Cleaning Removal of all visible oil, grease, soil, drawing and cutting compounds, and other soluble contaminants from steel surfaces with solvent, vapor, cleaning compound, alkali, emulsifying agent, or steam. SSPC-SP2 Hand Tool Cleaning Removes all loose mill scale, loose rust, loose paint, and other loose detrimental foreign matter by hand chipping, scraping, sanding, and wire brushing. SSPC-SP3 Power Tool Cleaning Removes all loose mill scale, loose rust, loose paint, and other loose detrimental […]

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