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Atomic Layer Deposition (ALD) technology originated in the late 20th century, initially successfully applied by Finnish scientists to the preparation of fluorescent materials such as ZnS and Mn, and Al2O3 insulating films, serving the flat panel display industry.

500-mesh residue, also commonly referred to as 500-mesh sieve residue or +500-mesh particle content, refers to the percentage by mass of particles in an inorganic powder material (such as calcium carbonate, talc, kaolin, silica powder, etc.) that cannot pass through a 500-mesh standard sieve.

Electrical performance, in a broad sense, refers to various electrical characteristics exhibited by materials under the influence of an applied electric field. For powder materials (especially inorganic insulating powders), the following core indicators are usually of concern:

Electrical performance, in a broad sense, refers to various electrical characteristics exhibited by materials under the influence of an applied electric field. For powder materials (especially inorganic insulating powders), the following core indicators are usually of concern:

Bulk density, also commonly referred to as apparent density or packing density, is the mass per unit volume of a powder material in its natural, free-flowing state.

Particle size, as the name suggests, refers to the size of a single powder particle. However, since powder is an aggregate of countless particles, these particles are usually not all the same size. Therefore, in practical industry and scientific research, the concept of "particle size" typically encompasses three aspects:

The primary reasons are its low solubility in water and the fact that the dissolved portion only partially dissociates to release hydroxide ions (OH⁻). Its alkalinity is much weaker than typical strong bases like sodium hydroxide or potassium hydroxide but slightly stronger than typical weak bases like aqueous ammonia. Therefore, it is often classified as a "medium-strength base" or a "sparingly soluble strong electrolyte."