Sandblasting (Bead Blasting)

Sandblasting (often referred to as Bead Blasting when using glass beads) is a surface finishing process where abrasive media is propelled at high velocity against a part’s surface. At Jucheng Precision, this is one of our most popular post-processing steps. It effectively removes CNC machine tool marks, burrs, and surface impurities, creating a uniform, non-directional matte texture.

We operate both manual cabinets for delicate prototypes and automated tumble-blasting systems for high-volume production. Whether you need a satin finish for cosmetic appeal or a rough etched surface to prepare parts for painting or bonding, our range of media (Glass, Aluminum Oxide, Ceramic) ensures the perfect surface profile for your specific application.

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Sandblasting

Key Specifications

Specification Technical Range Note
Max Part Size 1200 mm x 800 mm x 800 mm Cabinet internal dimensions
Media Types Glass Beads, Aluminum Oxide, Ceramic Affects roughness and brightness
Grit Size (Mesh) #80 (Coarse) to #220 (Fine) #120 is standard for cosmetic matte
Surface Effect Matte, Satin, Etched Non-reflective finish
Dimensional Change -0.005mm to -0.02mm Removes minimal material
Compatible Materials Aluminum, Steel, Stainless, Titanium, Plastics Softer plastics require lower pressure
Standard Lead Time 1 – 2 Days Very fast process

Blasting Media Types

Media Type Description Key Benefits & Applications
Glass Bead Blasting Spherical glass beads are used. The impact creates a dimpled surface (“peening”) rather than cutting the metal. Benefit: Creates a bright, smooth, satin finish. Does not remove much material.
App: Preparation for Anodizing, cosmetic electronic parts.
Aluminum Oxide Blasting Angular, sharp grit. It cuts into the surface, creating a rougher, darker matte finish. Benefit: Aggressive cleaning and etching. Increases surface area for bonding.
App: Pre-treatment for Powder Coating or Painting, rust removal.
Plastic Media Blasting Soft plastic particles used for delicate stripping or cleaning without damaging the substrate. Benefit: Extremely gentle. Won’t erode sharp edges or threads.
App: Cleaning molds, stripping paint from fiberglass or soft metals.

Design Guidelines for Sandblasting

Masking Requirements:
Blasting is abrasive. Critical features like threaded holes, bearing bores, or sealing surfaces must be masked (plugged) to prevent dimensional change or loss of tolerance. Tip: Clearly indicate “Mask” zones on your 2D drawings.

Material Removal:
While minimal, aggressive blasting (Al Oxide) can remove 0.01-0.02mm of surface material. Glass beads typically displace material rather than remove it, but can still affect ultra-tight fits (e.g., H7 tolerance holes).

Part Geometry:
Blasting is a “line of sight” process. Deep holes or internal channels cannot be blasted effectively. The media will not reach deep recesses, leaving them with the original machined finish.

Surface Hardness:
Blasting softer materials (like plastics or copper) requires lower pressure to avoid embedding the media into the surface, which creates a gritty feel.

Industry Applications

Medical Devices
Used on surgical instruments to create a non-reflective matte finish that reduces glare under bright operating room lights.

Consumer Electronics
The standard pre-treatment for Mac-style aluminum finishes. Blasting removes tool marks before Anodizing for a uniform cosmetic look.

Automotive
Used for cleaning die-cast engine parts or preparing suspension components for heavy-duty powder coating.

Bonding Prep
Creating a rough surface profile on metal parts to maximize the adhesion strength of glues, epoxies, or rubber overmolding.