High‑Alumina Bauxite Fine Powder

We supply high alumina bauxite aggregates specially developed for lost foam casting coatings. Our product portfolio covers alumina content ranging from 45% to 80%, to satisfy different working temperature requirements of lost foam production.Supported by our integrated production chain of self-mining, calcination and fine processing, we strictly control impurity indicators such as iron and alkali. The bauxite aggregates feature high refractoriness, good suspension performance, low thermal expansion and anti-sand-burning property, which help casting plants effectively reduce casting defects like sand sticking and peeling.

Service Overview

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High‑Alumina Bauxite Fine Powder

Special for Lost‑Foam Casting Coatings

As the core refractory aggregate for lost‑foam casting coatings, high‑alumina bauxite clinker powder is calcined at high temperature with 70‑80% Al₂O₃. Featuring high refractoriness, it fits water‑based and alcohol‑based coatings and is widely used for cast iron & cast steel components.

★70~80% ★1780°^{C ★}^180-325Mesh

AL₂O₃ refractoriness＞ particle size

As the primary refractory aggregate for coatings, high‑alumina bauxite powder governs coating refractoriness, high‑temperature strength and molten‑metal erosion resistance, directly influencing casting surface finish and production yield.

▉ High‑Temperature Calcination · Consistent Quality

Made from premium bauxite ore calcined in a vertical shaft kiln, the product goes through crushing, grinding and classification. With stably controlled 70‑80% Al₂O₃ and refractoriness ≥1780℃, it is the preferred refractory aggregate for lost‑foam casting coatings.

Compatible with water‑based and alcohol‑based lost‑foam coating systems, it can be directly used in facing or backing coating formulations with no special modification required. Widely adopted for cast iron and cast steel lost‑foam production, it helps coating manufacturers realize stable mass output and cut overall costs.

▉Five Core Advantages for Stable Production

ADVANTAGE · 01

Strict Impurity Control

Supported by in‑house mines and full‑chain operations of mining, calcination and deep processing, high‑temperature sintering in vertical shaft kilns ensures slight index variation and consistent batch quality.

Tight control over low‑melting‑point impurities like Fe₂O₃ and alkali metals avoids coating peeling, powdering and chemical burn‑on, lowering pitting and oxidation defects of castings.

ADVANTAGE · 02

Balanced coating performance,

with both breathability and density achieved.

-Well-graded particles give good slurry suspension and low sedimentation.

-Excellent paintability, no cracking after drying.

-Forms dense barrier against molten metal erosion.

-Proper air permeability quickly vents EPS pyrolysis gas.

-Reduces porosity, carbon deposition and wrinkling defects.

ADVANTAGE · 03

High temp dimensional stability

Excellent thermal shock resistance

-Low thermal expansion coefficient

-No cracking, peeling or metal runout during pouring

-High hot strength resists molten steel & iron penetration

-Ensures sharp casting contours

ADVANTAGE · 04

Good collapsibility

Reduces post-processing cost

-Easy coating stripping after pouring

-Less shakeout & shot blasting work

-Improved casting surface finish

-Reduced grinding cost, higher post-treatment efficiency

ADVANTAGE · 05

Strong process compatibility / High cost performance

★Compatible with mainstream lost foam coating formulas ★No special modification required Superior overall cost vs mullite, corundum powders ★Suitable for mass production in coating plants ★Reduces formula costs while retaining coating performance

█Available Specifications

面层涂料 · FACE COAT

270-325mesh

Suitable for precision castings requiring high surface quality.

◆Fine and narrowly distributed particle size

◆Forms dense, smooth coating surface

◆Effectively reduces sand adhesion and pitting defects

◆Greatly improves casting surface finish and dimensional accuracy

◆Recommended as topcoat for iron and steel castings

背层涂料 · BACK COAT

180-200mesh

Suitable for backup reinforcement of medium & large castings

◆Coarser particle size, prioritizing permeability and coating strength

◆High coating strength, good resistance to molten metal erosion

◆Excellent permeability for smooth venting of pyrolysis gas

◆Recommended as backup coating for medium & large castings

Professional technical team · Stable supply capacity · Customizable specifications

We own a complete industrial chain covering ore beneficiation, calcination processing and finished product grading. High-alumina bauxite powder with different Al₂O₃ contents, mesh sizes and particle size distributions can be customized according to customers’ coating formulas and casting material requirements.

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Shandong Huasheng Casting Materials Co., Ltd.

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