Foundry Mullite Sand 60 Mesh Precision Investment Casting Sand With Low Thermal Expansion Coefficient

1. Mullite Sand Introduction

1. The density of mullite 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. Its pH value is between 7 and 9, and the hardness of the shell is greater than 8 MPa.

2. The casting sand raw material of mullite is made of kaolin by high temperature sintering. 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%.

2. Mullite Sand Specifications

3. Mullite Sand General advantages

Ø Easy out of shell.

Ø No deformation and No reduced scale.

Ø Good brightness and Good finish.

3. Mullite Sand Characteristics

Ø High refractoriness.

Ø Aluminum content high, the iron content low.

Ø High volume density.

Ø Thermal expansion coefficients of small.

Ø Physicochemical stability.

Ø Fully calcined and Dust content low

Ø The specification standards.

4. Mullite Sand Particle sizes Available

Ø Size of sand: 8-16,16-30,30-60,30-80,60-80,80-120 (mesh):Used for investment casting.

Ø Size of powder: -200mesh,-270mesh,-325mesh: Used for investment casting and refractories.

Ø Size of particle: 0-1mm,1-3mm,3-5mm,5-8mm,8-15mm,0-5mm,0-50mm:Used for refractories.

5. Mullite Sand Applications

The product can be used for complex casting of carbon steel, stainless steel, heat-resistant steel.
1.Grain shape of the foundry sand is close to the true round with smooth surface, good fluidity and fillibility, easy to be filled ,it can get good formability and strength of mold.
2.Foundry sand has a good collapsibility, easy to carry out the sand cleaning operation. The usage amount of binder is more less than other types of sand.
3.Compounding moulding sand with foundry sand, casting will not have defects of expansion cause it has low thermal expansion rate.
4.Producing castings with foundry sand will have high accuracy ,less fracture and surface defects, what's more it can also improve the yield of casting.
5.Foundry sand has good crushing resistance and high strength, it's rarely broken even if reuse.