Mullite Sand Refractory Material Used for Investment Casting

• Customization: Available
• Certification: CE, ISO
• Technique: Calcined Kaolin
• Model NO.: Mullite Sand
• Application: Refractory
• Shape: Solid
• Transport Package: Woven Bag
• Specification: 25Kg Per Bag
• Trademark: Mullite
• Origin: Jiangsu, China
• HS Code: 2507001000
• Production Capacity: 2000000kg Per Year

Product Description

Mullite Sand Refractory Material Used for Investment Casting

Mullite sand is a high-performance refractory material made from fused alumina and silica, known for its excellent thermal stability, low thermal expansion, and resistance to thermal shock, making it ideal for high-temperature uses like investment casting molds (especially for aerospace/precision parts) and refractory linings where traditional sands fail. It offers superior casting quality with easy shell removal, smooth finishes, and high yields, replacing quartz sand in demanding applications.

Key Properties

(1) Chemical Formula: 

Component	CAS NO.	EC NO.	Concentration
Al2O3	1344-28-1	215-28-1	41-51%
SiO2	-	-	47-55%
Fe2O3	1309-37-1	215-168-2	≤1.2%
TiO2	1317-70-1	215-280-1	≤0.7%
MgO	1309-48-4	215-171-9	≤0.3%
CaO	1305-78-8	215-138-9	≤0.3%
K2O	12136-45-7	235-277-6	≤0.2%
Na2O	1313-59-3	215-208-9	≤0.2%

(2)High Refractoriness: Withstands extremely high temperatures (over 1750°C).Low Thermal Expansion: Resists cracking and deformation during rapid temperature changes.Chemical Stability: Good resistance to chemical corrosion.Particle Shape: Uniform grain size for good mold performance.

Applications

(1) Investment Casting: Used in shell making for precision castings (steel, copper, titanium alloys).
(2) Refractories: For furnace linings, kiln furniture, and other high-heat industrial uses.
(3) Ceramics: In specialized ceramic products.

Advantages in Casting

(1) Superior Finish: Produces castings with excellent surface finish and brightness.
(2) Easy De-shelling: Molds break away easily from the finished casting.
(3) High Yield: Reduces defects, leading to higher usable product rates.
(4) Reduced Cracking: Its low expansion minimizes shell cracking, especially with silica sol binders.