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1. What Is Olivine Moulding Sand And Its Advantages?
2. What is the difference between Olivine and Silica Sand?
3. Why is it called green sand when it is black?
4. How do I mix green sand molding sand?
5. How much water should be added to the sand?
6. What is collapsibility?
7. What is permeability?
8. What is baume pertaining to mold and core wash?
 
  • What Is Olivine Moulding Sand And Its Advantages?
  • As a foundry aggregate, olivine is noted for its high fusion point, low uniform thermal expansion, and its remarkable ability to resist fracture from thermal shock. Olivine has been famous for years in producing excellent non-ferrous castings. Today, more foundrymen are realizing that olivine works equally well in iron, manganese and stainless steel.
  • The angular olivine grain acts to control the rammed or squeezed density of the mold. This feature combined with the favorable coefficient of thermal expansion, usually permits the elimination of organic filler from molding sand formulations. This angular grain also allows use of finer sands while retaining good permeability.
  • Another advantage of using olivine sand is its industrial hygiene characteristics. Medical research indicates that olivine will not cause silicosis.
  • Olivine sand is available in several grades and packaged in 3000# sacks or 100# bags.
  • What is the difference between Olivine and Silica Sand?
  • These are both natural deposits. With Olivine, a finer sand may be used due to increased permeability, and thermal expansion is much lower than silica, therefore reducing expansion defects resulting in a smoother casting. There are also significant heath advantages with Olivine in that it does not cause silicosis.

  • Why is it called green sand when it is black?
  • The sand takes the black color due to the burning of the sand by hot metal. The term "green sand" refers to the green strength property that the sand "stands up" by itself and does not fall over or get hard.

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