SSPC-SP 10: Near-White Metal Blast Cleaning

drew on January 2, 2025

Abstract

Achieving a durable and long-lasting coating system begins with proper surface preparation. Among the SSPC standards, SSPC-SP 10 Near-White Metal Blast Cleaning strikes a balance between thorough cleanliness and cost-efficiency. This standard is widely adopted in industries requiring stringent preparation for protective coatings, such as oil and gas, marine, and heavy industry.

This article provides an in-depth look at SSPC-SP 10, exploring its requirements, applications, benefits, and best practices.

Introduction to SSPC-SP 10

SSPC-SP 10 Near-White Metal Blast Cleaning, also known as NACE No. 2, is a standard established by the Society for Protective Coatings (SSPC) for the removal of contaminants from metal surfaces. This standard requires the removal of all visible rust, mill scale, and old coatings, while allowing for minimal staining or shadows over no more than 5% of the surface. SSPC-SP 10 ensures the substrate is adequately prepared for high-performance coatings, offering a robust foundation for critical applications.

Requirements of SSPC-SP 10

To comply with SSPC-SP 10, the prepared surface must:

  1. Be free of all visible mill scale, rust, and paint.
  2. Allow for light shadows, streaks, or stains caused by tightly adhered contaminants to remain on no more than 5% of the surface area per square inch.
  3. Exhibit a surface profile suitable for the specified coating system, typically measured in mils using tools such as replica tape or surface profile gauges.
  4. Be free of oil, grease, and other soluble contaminants, which are often addressed through SSPC-SP 1 Solvent Cleaning prior to blasting.

The SSPC-SP 10 Process

1. Abrasive Blast Cleaning

SSPC-SP 10 is achieved through abrasive blasting using media such as:

  • Steel Grit and Shot: For aggressive cleaning and creating a deep surface profile.
  • Aluminum Oxide: Suitable for non-ferrous metals or when minimal substrate damage is required.
  • Crushed Glass or Garnet: Eco-friendly options for achieving uniform cleanliness and profile.

2. Pre-Cleaning

Before abrasive blasting, SSPC-SP 1 Solvent Cleaning is performed to remove oil, grease, and other soluble contaminants, ensuring effective blast cleaning.

3. Inspection

Inspect the surface under proper lighting to confirm compliance with SSPC-SP 10 requirements. Tools such as surface cleanliness comparators and white light flashlights are often used for accurate inspection.

Applications of SSPC-SP 10

1. Oil and Gas Infrastructure

For pipelines, storage tanks, and refineries, SSPC-SP 10 ensures surfaces are prepared for coatings designed to withstand corrosive chemicals and extreme temperatures.

2. Marine and Offshore Structures

Ship hulls, offshore platforms, and subsea structures require near-white metal cleanliness to ensure coating adhesion and durability in aggressive saltwater environments.

3. Heavy Industry

Industrial equipment, structural steel, and machinery benefit from SSPC-SP 10 preparation, enabling superior performance of abrasion-resistant and chemical-resistant coatings.

4. Chemical Processing Plants

SSPC-SP 10 is critical for preparing surfaces in environments exposed to harsh chemicals, such as secondary containment systems and reactor vessels.

5. Military and Aerospace Applications

SSPC-SP 10 is used for preparing steel surfaces on military vehicles, aircraft, and naval vessels to ensure coatings meet stringent performance requirements.

Advantages of SSPC-SP 10

  1. Enhanced Coating Performance
    The near-white metal finish ensures maximum adhesion for high-performance coatings, extending the lifespan of the substrate.
  2. Cost-Effective
    While less rigorous than SSPC-SP 5 White Metal Blast Cleaning, SSPC-SP 10 provides sufficient cleanliness for most industrial applications at a lower cost.
  3. Versatility
    Suitable for a wide range of industries and substrates, SSPC-SP 10 offers a flexible and practical solution for critical applications.
  4. Environmental Compliance
    Modern abrasive blasting systems paired with proper containment measures ensure compliance with environmental regulations.

Comparison with Other SSPC Standards

Check out our full guide to industrial coating applications.

Best Practices for SSPC-SP 10

  1. Combine with SSPC-SP 1
    Perform solvent cleaning to remove oil and grease before abrasive blasting, ensuring effective preparation.
  2. Select the Right Abrasive
    Match the abrasive to the substrate and desired surface profile to balance efficiency and cost.
  3. Inspect Thoroughly
    Use proper lighting and inspection tools to confirm compliance with SSPC-SP 10 cleanliness and profile requirements.
  4. Pair with Compatible Coatings
    Choose coatings designed for the specified surface profile and operating conditions.

Challenges and Limitations

  1. Higher Cost than SSPC-SP 6
    SSPC-SP 10 requires more labor, time, and materials than less stringent standards.
  2. Not Suitable for All Projects
    In some cases, SSPC-SP 5 may be required for maximum cleanliness, especially in highly corrosive environments.
  3. Operator Dependency
    Achieving uniform cleanliness and profile depends on the skill and experience of the blasting team.

Industrial Coating Systems for SSPC-SP 10

  • Epoxy Coatings: Provide excellent chemical resistance and durability for industrial and marine applications.
  • Polyurethane Coatings: Offer abrasion resistance and UV stability for outdoor structures.
  • Zinc-Rich Primers: Protect against corrosion in aggressive environments.
  • High-Performance Linings: Ensure long-term protection for storage tanks and secondary containment systems.

Conclusion

SSPC-SP 10 Near-White Metal Blast Cleaning is a critical standard for industries requiring high-performance coatings. By removing all visible contaminants and allowing minimal staining, SSPC-SP 10 ensures the substrate is adequately prepared for durable and long-lasting protective systems. Its balance between thorough cleanliness and cost-efficiency makes it a preferred choice for oil and gas, marine, military, and heavy industry applications.

For more information about SSPC standards or to discuss how SSPC-SP 10 can benefit your project, contact us.