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Investment Material
Qus:
1.Classify investment & write in detail about the composition and function of each component of a gypsum-
bonded investment material.
Ans:
According to binders used there are three types of investment materials.
A. Gypsum- bonded investment.
B. Phosphate – bonded investment materials.
C. Ethyl – Silicate bonded investment materials.
According to Expansion:
A. Type -1
B. Type -2
C. Type -3
Composition and Function of each component of a gypsum – bonded investment material.
A.Sillica:
Silica is any of its allotropic form , such as cristobalite or quartz or both.
Function of sillica:
1.Acts as a refractory.
2.Regulates mold expansion.
B.Calcium Sulphate:
1.To react with water and on hydration , to bind the silica together.
2.To impart sufficient strength of the mould by providing rigidity.
3.To contribute to the mould expansion by setting expansion.
C.Reducing Agent:
Reducing Agent such as charcoal powder provides a reducing environment and reduces any oxide form in the
metal.
D.Modifres:
For example , sodium chloride and boric acid.

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Investment materials

  • 1. Investment Material Qus: 1.Classify investment & write in detail about the composition and function of each component of a gypsum- bonded investment material. Ans: According to binders used there are three types of investment materials. A. Gypsum- bonded investment. B. Phosphate – bonded investment materials. C. Ethyl – Silicate bonded investment materials. According to Expansion: A. Type -1 B. Type -2 C. Type -3 Composition and Function of each component of a gypsum – bonded investment material. A.Sillica: Silica is any of its allotropic form , such as cristobalite or quartz or both. Function of sillica: 1.Acts as a refractory. 2.Regulates mold expansion. B.Calcium Sulphate: 1.To react with water and on hydration , to bind the silica together. 2.To impart sufficient strength of the mould by providing rigidity. 3.To contribute to the mould expansion by setting expansion. C.Reducing Agent: Reducing Agent such as charcoal powder provides a reducing environment and reduces any oxide form in the metal. D.Modifres: For example , sodium chloride and boric acid.