Foundry molds

Phenol—formaldehyde resins are used as mol ding compounds (see Phenolic resins). Their thermal and electrical properties allow use in electrical, automotive, and kitchen parts. Other uses for phenol—formaldehyde resins include phenoHc foam insulation, foundry mold binders, decorative and industrial laminates, and binders for insulating materials. 

The recovery of sand from foundry molds and cores is much easier when binders made water soluble by use of sodium alumiaate are used ia place of iasoluble resin binders (35,36). Sodium alumiaate acts as a setting accelerator for Portiand cement (qv) (37). In similar appHcation, addition to concrete provides a longer gel time before fully curing (38). 

Isocure A process for making foundry molds developed by Ashland Chemical Company. In 1990 it was announced that a pilot plant was to be built in cooperation with the USSR and that the process had been licensed in China. See also Pep Set. 

Zircon is used to create the foundry molds used to make metal pieces of all shapes. Molten metal is poured into the mold. When it cools, it is removed from the mold. The use of zircon in a refractory mold produces a smooth surface on the metal. 

Silica, the main component of silicates, is widely used as mentioned earlier. In its crystalline and noncrystalline polymorphs, silica is used industrially as a raw material for glasses, ceramics, foundry molds, in the production of silicon, and more recently in technical applications such as quartz oscillators and optical waveguides for longdistance telecommunications. Of the crystalline forms, only a-quartz is commonly used as sand or as natural and synthetic single crystals. Cristobalite is often utilized as the synthetic phase in glass-ceramics. 

Other applications include sizing agents, adhesives, and water-loss inhibitors.1644 1658-1661 A granular distarch phosphate was reported as a paper adhesive1515 1517-1521 and also as a sand binder for foundry molds.1662 The... 

Vinsoi . [Hercules] I wood resin derivs. thermoidastic resin fev lacquers, adhesives, elec, insulation, floor coverings, foundry molds as extender for latmces water rqtdlent, air entrainment aid fOT masonry cements asi t emulsifier. 

Chapter 61 Foundry Mold or Core Compositions and Method. 789... 

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