White Fused Alumina

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White Fused Alumina

White fused alumina is produced from high-quality aluminum oxide powder, refined and crystallized through electric arc smelting. It features high purity, excellent self-sharpening properties, resistance to acid and alkali corrosion, high-temperature stability, and stable thermal performance. It is slightly harder than brown fused alumina but less tough. With strong grinding capabilities, low heat generation, and high efficiency, it is suitable for making abrasive tools used for grinding high-carbon steel, high-speed steel, and stainless steel. Fine-grit abrasives can also be used in precision casting and high-grade refractory materials.

Available Grain Sizes

Fraction		0-1mm 1-3mm 3-5mm 5-8mm
Fine Powder		200#-0 320#-0
Grit		8# 12# 14# 16# 20# 24# 30# 36# 46# 54# 60# 70# 80# 90# 100# 120# 150# 180# 220# 240#
Micro Powder	JIS Standard	#240 #280 #320 #360 #400# #500 #600 #700 #800 #1000 #1200 #1500 #2000 #2500 #3000 #4000 #6000 #8000 #10000
Micro Powder	FEPA Standard	F230 F240 F280 F320 F360 F400 F500 F600 F800 F1000 F1200 F1500

Typical Chemical Analysis

Grain Size	Chemical Composition (%)
Grain Size	Al2O3	Fe2O3	Na2O	SiO2
Fraction	≥99	≤0.08	≤0.35	≤0.08
Fine Powder	≥98.5	≤0.15	≤0.40	≤0.08
Grit	≥99	≤0.1	≤0.35	≤0.08
Micro Powder	≥98	≤0.1	≤0.40	≤0.08

Typical Physical Properties

Mohs Hardness	9.0
Bulk Density	1.55-1.95g/cm3
True Density	3.95g/cm3
Volume Density	3.60
Melting Point	2250℃
Maximum Use Temperature	1900℃

Applications

White fused alumina is widely used in various industrial fields due to its high hardness, toughness, and excellent thermal stability. Common application areas include:: Cutting and grinding: Used for manufacturing cutting and grinding tools, such as grinding wheels and sanding belts.; Polishing: Suitable for polishing various materials, including metals, glass, and ceramics.; Abrasive media: Used as abrasive media in applications like petroleum industry abrasives.; Refractory materials: Ideal for producing high-temperature refractory materials, such as kiln linings and crucibles.; Precision casting: Used in precision casting sand and core sand to improve casting accuracy and surface quality.

Ceramic membranes
Grinding wheels
Floor coatings
Sandblasting abrasives
Refractories

Manufacturing Process

White fused alumina is commonly prepared using several methods, with the ball milling method being one of the most prevalent. In the ball milling process, raw materials are mixed with milling media (such as glass or steel balls) and ground under high-speed rotation. Another method is the electric fusion process. In this method, raw materials are placed in an electric furnace, melted at high temperatures, and then cooled and crushed to produce white fused alumina.

Packaging

25kg packaging
25kg small bag bulk bag
25kg small bag pallet wrap

FAQs

White fused alumina is widely used for making sharpening stones due to its white color, high purity, excellent crystal structure, and high bulk density. It is self-sharpening, has strong grinding ability, generates minimal heat, is efficient, and resistant to acid, alkali, and high temperatures. These characteristics make it an ideal material for home-use sharpening stones.

White fused alumina, after being sieved according to grain size, can be used for grinding and polishing, making bonded abrasives, as refractory materials, and for sandblasting. It is also suitable for precision casting and is sometimes referred to as special sand for precision casting.

The lifespan of white fused alumina is determined by the impurities it contains. The alumina content directly reflects the quality of the white fused alumina, which in turn affects its performance and durability.

White fused alumina powder is typically packaged in woven bags with inner liners, available in 25kg and 20kg sizes. If customers have specific packaging requirements, they can communicate with our factory, and we will coordinate with the packaging manufacturer to meet their needs as best as possible.