A wide range of abrasive grit sizes is used in sandblasting processes, each serving a distinct purpose and yielding specific effects in practical applications. Below is a detailed breakdown of abrasive grades by mesh size, along with their corresponding application scenarios and outcomes:

Coarse Abrasive (16–30 Mesh)
Application Scenarios:

• Heavy-duty rust removal: Effective for eliminating thick rust layers and extensive oxide scale.

• Coating removal: Suitable for stripping heavy paint, coatings, or other surface coverings.

• Cleaning of large steel structures: Examples include ship hulls, bridges, and large storage tanks.

Effects:

• Produces a highly rough surface, ideal for adhesion of thick coatings or heavy-duty anti-corrosion layers.

• Rapidly removes surface contaminants but may cause significant substrate wear.

Medium-Coarse Abrasive (40–60 Mesh)
Application Scenarios:

• General cleaning: Removes medium-thickness rust, old paint, and oxide scale.

• Surface roughening: Prepares surfaces for subsequent spraying or coating applications.

Effects:

• Creates a relatively uniform surface profile, promoting coating adhesion.

• Offers efficient cleaning performance suitable for medium-intensity surface preparation.

Medium-Fine Abrasive (80–100 Mesh)
Application Scenarios:

• Fine surface treatment: Ideal for detailed cleaning of metal products and mechanical components.

• Mild rust removal: Effective for light rust and thin oxide layers.

Effects:

• Yields a smoother surface, suitable for medium-thickness coatings or plating.

• Removes contaminants effectively without excessive substrate wear.
  

Fine Abrasive (120–180 Mesh)
Application Scenarios:

• Surface refinement: Used for precision parts such as molds and instrument components.

• Pre-polishing treatment: Prepares surfaces for polishing by removing minor defects.

Effects:

• Delivers a very smooth surface, optimal for coating and plating adhesion.

• Cleans meticulously, resulting in a uniform and consistent surface texture.

Ultra-Fine Abrasive (220–320 Mesh and Finer)
Application Scenarios:

• Ultra-fine polishing: Applied where high smoothness is required, such as optical components and electronic housings.

• Precision cleaning: Used for high-precision molds and delicate parts.

Effects:

• Produces an exceptionally smooth surface, meeting stringent finishing requirements.

• Effectively removes microscopic contaminants and imperfections, achieving a near-mirror finish.

Summary of Abrasive Grit Effects by Mesh Size

• Coarse (16–30 mesh): Efficient for heavy contaminant removal; results in a rough surface.

• Medium-Coarse (40–60 mesh): Balances cleaning speed and surface roughness; ideal for general-purpose use.

• Medium-Fine (80–100 mesh): Provides a smooth finish; suitable for fine treatment and light rust removal.

• Fine (120–180 mesh): Yields a very smooth surface; ideal for precision components and pre-polishing.

• Ultra-Fine (220–320+ mesh): Delivers extreme smoothness; used for high-precision and high-gloss applications.

Selecting the appropriate abrasive grit size depends on the specific processing requirements, workpiece material, and desired surface outcome.