Shot casting

Example 1. One-Shot Cast Elastomer. This is an example of a one-shot cast elastomer using a PMDI, two polyols, and a chain extender. It is a good formulation to begin with because it is simple and uses low-viscosity ingredients that can be blended and cast at room temperature. 

Example 2. Two-Shot Cast Elastomer (Prepolymer Method). Synthesis of polyurethane elastomers via the prepolymer method is challenging and requires especial attention to details and techniques. This example is a relatively easy one, using a low-viscosity, 9.6% NCO MDI-based poly(tetramethylene ether) glycol prepolymer. It is adapted from the Bayer Product Information Bulletin for Baytec ME-090 prepolymer. 

Turner, S. Richard, 1 Two-component (2-K), nonsagging, polyurea structural adhesive, preparation of, 255-256 Two-component (2-K) systems, 238-241 Two-component (2-K) waterborne polyurethane coatings, 206 preparation of, 254-255 Two-shot cast elastomer, preparation of, 249-250... 

Centrifugal Shot Casting Atomization (CSC) 150-1000 Standard deviation 1.3-1.4 Fe, Co, Ni, Ti alloys, Alumina, Uranium monocarbide 102-105 Narrow size distribution Coarse particles, Low EE... 

Shot metal Pb, 99 As, 1 Harder than Pb yet readily fusible Bullets and shot (cast and molded)... 

Stationary casting or shot casting contact cooli ng... 

Product Names Perma-Steel Shot Perma-Steel Grit Common Name Cast Steel Shot Cast Steel Grit Chemical Family Ferrous ... 

The scale can also be removed by shot blasting using abrasive grits such as dry sand, less than I mm (p. This method is more suited for components not suited to the dip method and cast iron components, in which the acid may become trapped in the porous surfaces. For sheet-metal components and complicated shapes and crevices, the dip method alone is recommended. 

Shot blasting room A ventilated room devoted to the cleaning of castings by the use of various grades of shot. 

Aluminium, n. aluminum, aluminium, -blech, n. sheet aluminum, -bor, n. aluminum boride, -draht, m. aluminum wire, -eisen, n. ferro-aluminum. -erz, n. aluminum ore. -feilspane, m.pl. aluminum filings, -fluorwasserstoff-saure, /. fluoaluminic acid, -folie, /. aluminum foil, -formiat, n. aluminum formate, -giesserei, /. aluminum foundry or founding. -griess, m. (coarse) aluminum powder aluminum shot. guss, m. aluminum cast-ing(s), cast aluminum. 

The unequal attack which occurs in tap water, condensate and other mild electrolytes may lead to perforations of thin-gauge sheet and even to deep pitting of castings. In stronger electrolytes the effect is variable. In chloride solutions such as sea-water, attack on the metal usually results in the pitting of some areas only, but where the metal surface has been rendered reactive, as by shot blasting, attack may be so rapid that uniform dissolution over the whole surface may occur. In either case magnesium-base alloys are not usually suitable for use in aqueous liquids since they are not intrinsically resistant to these electrolytes. 

The standard method of cleaning cast iron for enamelling is by grit or shot blasting which may be preceded by an annealing operation. 

The full-prepolymer, quasi-prepolymer, and one-shot techniques may appear to be quite similar, but they each have important bearing on equipment requirements and physical properties. The full-prepolymer method, for example, is die process of choice for making high-performance cast elastomers with superb dynamic properties, such as industrial bumpers and bushings. Quasi-prepolymers are used in less demanding applications like shoe soles, adhesives, and spray elastomers. One-shots make up the rest, including most foams and elastomers. 

---