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Table of Contents

Definition

Sandblasting (also known as abrasive blasting) is a mechanical surface finishing process. It uses compressed air to propel fine abrasive media at high velocity onto workpiece surfaces. The impact of abrasives physically modifies the surface texture of metals, composites and engineering plastics, serving as a universal pre-treatment and decorative finishing solution.

Working Principle

Powered by compressed air, abrasive particles such as aluminum oxide, glass beads and stainless steel shots are blasted onto parts. The collision and micro-cutting action strips surface contaminants and creates controllable uniform roughness on substrates.

Common Abrasive Media

  1. Aluminum Oxide High hardness with strong cutting force. Ideal for heavy rust removal, oxide layer stripping and aggressive surface texturing on steel, aluminum and stainless steel.
  2. Glass Beads Gentle impact without deep material removal, delivering a delicate satin matte finish. Widely used for decorative blasting and minor scratch elimination.
  3. Stainless Steel Shots Metallic media with low dust generation. Applied for shot peening to release internal stress and improve fatigue resistance of metal components.
  4. Silica Sand Low-cost abrasive, yet restricted in most European and American factories due to hazardous free silica dust regulations.

Core Functions

  1. Surface Cleaning Eliminate rust, scale, welding slag, oil residues and mold release agents. It is a mandatory pre-process before anodizing, spray painting, powder coating and electroplating to maximize coating adhesion.
  2. Decorative Matte Finish Eliminate machining tool marks and tiny scratches, producing consistent non-reflective satin texture for premium aesthetic appearance.
  3. Controlled Surface Roughening Generate micro-rough profiles to form mechanical interlocks for adhesives and surface coatings, preventing peeling and delamination.
  4. Stress Relief & Strengthening Fine steel shot blasting relieves internal machining stress and enhances components’ fatigue and corrosion resistance.
  5. Deburring Remove micro burrs and sharp edges without compromising critical dimensional tolerances.

Applicable Materials

  • Metals: Aluminum, stainless steel, copper, iron, titanium alloy, die-cast alloys
  • Composites: Carbon fiber panels, fiberglass boards
  • Hard engineering plastics: PC, ABS, POM and other rigid plastic parts

Advantages & Limitations

Advantages

  1. Extremely versatile, compatible with nearly all rigid workpieces;
  2. Adjustable surface roughness via different abrasive grain sizes;
  3. High batch processing efficiency, even on complex curved and hollow geometries;
  4. Chemical-free mechanical treatment with no risk of substrate corrosion.

Limitations

  1. Thin-walled delicate parts may deform under blasting impact; soft plastics will sustain surface scratches;
  2. It only alters physical surface properties and provides no anti-corrosion protection. Secondary finishing like anodizing or painting is required after blasting;
  3. Slight dimensional loss occurs, which may affect ultra-precision parts with tight tolerances.

Typical Production Workflows (Industrial Standard)

  1. CNC Machining → Sandblasting → Anodizing
  2. Die Casting → Sandblasting → Powder Coating
  3. Plastic Molding → Fine Sandblasting → Spray Painting

Surface treatment resources

Frequently Asked Questions

  To shorten the delivery cycle of CNC workpieces, we start with the documents submitted by customers. Please provide complete and clear 2D drawings, 3D models, dimensional tolerances, surface requirements, and processing specifications, and specify special materials, surface treatments, and assembly standards. Avoid incomplete drawings, ambiguous markings, and version confusion.
Complete documents enable direct programming, order splitting, and production scheduling, cutting down repeated confirmation and supplementary work. Customers are also advised to finalize order quantity, delivery schedule, and special requirements in advance. Eliminating repeated communication and rework risks at the source accelerates the whole process and effectively shortens the overall lead time.

  With 12 years of expertise in CNC machining, YUEYI stands out from other manufacturers and middlemen. Our factory covers an area of 4,000 mu and is equipped with over 100 processing machines. We achieve a machining precision up to 0.001 mm, capable of producing high-precision components. Backed by standardized production management, our on-time delivery rate reaches 98%. As a direct manufacturer with full in-house production capacity, we control every production link without outsourcing. We deliver consistent quality, outstanding precision and reliable lead time, making us your trustworthy partner for CNC precision machining.

  Fast delivery is one of our key strengths. For 3D printing orders, we support delivery within 3 days, ideal for rapid prototyping and urgent sample requests. For regular CNC machining projects, the standard lead time is around 3 weeks.
We manage the whole process in-house, from drawing review and process planning to production, quality inspection, and shipment, with no intermediate links. Equipped with complete facilities and an experienced team, we reliably fulfill both urgent sample orders and mass production. We guarantee stable lead time and consistent quality to keep your projects on track.

  We offer a full range of surface treatments with rich color options. Our services include anodizing, powder coating, spray painting, electroplating, wire drawing, sandblasting, and polishing. Anodizing features various colors and strong anti-corrosion performance for aluminum parts. Powder coating and spray painting come with extensive color selections and durable coatings. Electroplating enhances luster and rust resistance. Wire drawing creates fine linear textures, while sandblasting delivers a matte finish. Polishing achieves a bright and smooth surface. All finishes can be customized in colors and styles to match your application needs.

  Yes, we fully provide complete material certificates and relevant test reports for all CNC-machined parts. All raw materials are sourced from qualified suppliers with authentic documentation. We can offer material certifications, dimension inspection reports, and quality test records upon request. Every product is strictly inspected before delivery. These official documents fully guarantee material compliance and product quality, supporting your quality audit and project requirements.

  We take strict quality control measures in advance to prevent non-conforming products. Every workpiece is fully inspected dimensionally and visually during and after production to ensure full compliance with design drawings and specifications.
In the rare case of non-compliant items, we will take immediate responsibility. We will promptly confirm the issues with you, then arrange free rework or remanufacturing as required. All related costs will be borne by us. We will also analyze the root cause to optimize our processes and avoid similar problems recurring. Our goal is to deliver qualified products steadily and safeguard your project progress.

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