Different Types of molding sand

Types of sand used in casting

Good casting can be determined by the pattern and the types of molding sand used. One need to understand the types of molding sand used in casting. Types of molding sand

In some my previous post, I have enlighten different articles on casting. Check:

Today I will be discussing on different types of sand used in casting. The following explained below are molding sand used for casting:

Types of molding sand

Green sand: this types molding sand is a natural sand with enough moisture in it. It contains clay of about 15 to 30%, 8% of water and silica. The clay and water act as binding material that give strength to the mold. it is used only for simple and rough casting. It is used for both ferrous and non-ferrous metal.

Dry sand: this casting sand is obtained when the moisture from green sand is removed. It used for large and heavy casting, because the molding sand offers greater strength, rigidity and thermal stability to the casting.

Facing sand: as the name implies, facing sand is used for facing the mold. it consists of fresh silica sand and clay. That is, no used sand is added. It is used directly next to the surface of the pattern. Facing casting sand must have high refractoriness and strength because it comes in direct contact with the hot molten metal. This molding sand offers the mold a very fine grain.

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Core sand: this is another types of molding sand contains silica sand mixed with core oil (linseed oil, resin, and mineral oil) and other binding materials like, dextrin, corn floor, and sodium silicate. It is used for cores making and has high compressive strength.

Loam sand: loam sand is equal mixture of sand and clay with a sufficient amount of water added to it. It is also used for large and heavy mold like, hoppers, turbine parts etc.

Parting sand: this molding is pure silica sand poured on the faces of pattern before molding. Parting sand is sprinkled on the pattern before it is embedded in the molding sand. This casting sand is also sprinkled on the contact surface of cope, drag and cheek.

Backing and floor sand: this casting sand is used to back up the facing sand and to fill the volume of the box. It is also known as floor sand.

System sand: this molding sand is applicable to mechanical heavy castings. It has high strength, permeability and refractoriness. System sand is used for machine molding to fill the whole flask. Facing sand is not use in this molding because cleaned and has special additives.

Molasses sand: this molding sand is also used for core making and small casting of intricate shapes. It contains molasses as it source of binding.

read: Different types of Foundry tools and equipment and TYPES OF PATTERN USED IN FOUNDRY WORK (CASTING PROCESS)

And that is it for this article, types of molding sand (casting sand). I will hopefully believe you understand this article by answering the question below via our comment box. Don’t forget to share with other student. Thanks for reading!

Question: briefly explain loam sand

One comment

  1. I liked that you mentioned that system and is applicable to castings that are heavier and that it has higher strength. Recently I was talking to one of my friends and she told me that her husband is looking for foundry sand and services that could help him with some casting that he has been working on for a few weeks. I have never known too much about industrial and manufacturing services, but I think looking online might be the best decision they can make to find the right service.

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