Zinc Aluminate

Updated: 2026-07-15

Overview

Zinc aluminate (ZnAl2O4) is a synthetic ceramic compound belonging to the spinel group of minerals. It is characterized by its high thermal stability, chemical resistance, and mechanical durability. The material is typically produced via solid-state reactions or sol-gel processes, yielding ultra-fine powders with controlled particle sizes. Due to its inert nature and ability to withstand extreme temperatures (up to 1950°C), zinc aluminate is widely used in industrial applications. Its versatility spans from catalysis to advanced ceramics, making it a critical material in sectors requiring high-performance solutions under harsh conditions.

Physical and Chemical Properties

Zinc aluminate exhibits a cubic crystal structure, contributing to its exceptional thermal and chemical stability. It is insoluble in water and most organic solvents, with a density of 4.5 g/cm³. The material maintains structural integrity even at temperatures nearing its melting point. Key properties include low thermal expansion, high hardness, and resistance to oxidation and corrosion. These attributes make it ideal for applications where materials are exposed to aggressive environments or rapid thermal cycling. Its optical transparency in certain wavelength ranges also enables niche uses in optoelectronics.

Main Applications

In catalysis, zinc aluminate serves as a support material for catalysts in petroleum refining and chemical synthesis due to its high surface area and stability. It is also a key component in refractory linings for furnaces and kilns, where it resists slag penetration and thermal shock. The electronics industry utilizes zinc aluminate in dielectric ceramics and substrates for integrated circuits. Additionally, its UV-absorbing properties make it valuable in pigments and coatings for sunscreens or UV-resistant paints. Emerging applications include sensors and luminescent materials.

Safety and Storage

While zinc aluminate is generally non-toxic, fine powders pose inhalation risks. Use NIOSH-approved dust masks and ensure proper ventilation during handling. Avoid contact with strong acids, which may decompose the material. Store in sealed containers under dry conditions to prevent moisture absorption, which can affect performance in sensitive applications. Bulk storage should prioritize segregation from reactive substances. Spills should be cleaned with dry methods to avoid slurry formation.

B2B Procurement Guide

Industrial buyers should specify purity levels (typically 99% or higher) and particle size distribution (e.g., D50 <1µm for ultrafine grades). Certificates of Analysis (CoA) from suppliers should validate these parameters. Consider production capacity and lead times, as custom particle sizes may require extended manufacturing periods. Pricing varies significantly by order volume; negotiate tiered discounts for large purchases. Reputable suppliers often provide technical support for application-specific formulations.