200 Mesh Refractory Foundry Sand With Low Thermal Expansion Coefficient

200 Mesh High-alumina Investment Casting Sands with Low Thermal Expansion Coefficient

1. Description:

a.Our prodcts refractory foundry sands are made from mullite .Mullite is made of kaolin by high temperature sintering.

b.The density of casting sand raw ore is generally greater than 2.5g/m3, the true specific gravity is 2.6g/cm3, the water content is less than 0.03%, and the fire resistance is greater than 1750 ℃. Under the condition of high temperature burning, its weight will be reduced by 0.3% and not more than 0.4%, which shows the stability of mullite's chemical properties. .

c.The chemical components of mullite are all chemical substances with strong fire resistance, and their properties are relatively stable. It mainly includes: alumina, silica, etc., the content of alumina is between 42% and 46%, and the content of silica is between 51-53%. The best raw ore make our foundry sands can keep relatively stable below 1750℃.

d.Our precision refractory foundry sand is popular by all customs with high aluminum content, low iron content, low coefficient of thermal expansion, high refractoriness and stable thermochemical proprities, which are made of hard clay mineral resources through high-temperature roasting, crushing, screening, Raymond, iron removal and other machining processes.All process make casting sands uniform particle size ,even through four layer screens in our factory.

2. Application:

The foundry sands are mainly used in precision investment casting,especially in reinforcement layer, gypsum filling V method molding and vacuum suction casting, as well as refractories for large, medium and small steel castings, widely used in machinery, aviation, weapons, metallurgy, petroleum and other industries.

The grain size of mullite is also different for different purposes. Generally, we use "mesh" to measure the grain size of mullite, including 8 to 16 mesh, 16 to 30 mesh, 30 to 60 mesh, 60 to 80 mesh, 80 to 120 mesh; mullite powder mainly includes 200 mesh and 300 mesh.

We can provide special foundry sands for your all purposes.

When you make a precison parts shell ,To make the back layer slurry, 200 mesh mullite and silica sol are needed, and 30-60 mesh mullite is added to the slurry.Sealing paste, only need to use 200 mesh mullite powder and silica sol.

3. Technical Indicators

More Products Pictures

1. 16-30Mesh Grade Ⅰ

2. 16-30Mesh Grade Ⅱ

3. 16-30 Mesh Grade Ⅲ

Our mine company established in 2003,and its trade company ,Qingdao Jinjunxuan International Trade Co.,Ltd,founded in 2018, relying on the group's logistics advantages and rubber trade experience, Jinjunxuan international has been shouldering the responsibility of group logistics business development and model transformation since its establishment.

In 2019,  In view of the fierce competition in the raw material market, we pay more attention to the quality of products and firmly believe in the concept of "quality-oriented, honest operation". We also rely on  mine company technical advantage to develop customized products.

Using our product, the casting is easy to be shelled, not deformed, not easy to shrink, with good finish and high yield. After that, remind the customer not to be greedy for cheap choice of cheap sand so as not to affect the casting finished products.

It is recommended to choose the products of regular mullite manufacturers with reasonable price, quality and more guarantee. We hope that through our efforts and careful service, we can provide customers with cost-effective products and contribute to the development of the investment casting industry.