ASTM B799 is the ASTM standard for evaluating porosity in gold and palladium coatings by sulfurous acid/sulfur-dioxide vapor. It provides a defined test method for checking whether these noble-metal finishes contain pores that could affect barrier performance, durability, or service behavior. For users comparing coated components, this standard helps support consistent quality control and more reliable product evaluation. ASTM B799 is especially relevant when coating integrity matters to fit, function, or long-term protection.

What is ASTM B799?

ASTM B799 is a test method focused on porosity in gold and palladium coatings using sulfurous acid/sulfur-dioxide vapor exposure. As an ASTM standard, it is intended to give a repeatable way to assess coating continuity rather than simply visual appearance. The method is generally used to help determine whether a plated layer contains pores that may expose underlying material. In practice, ASTM B799 supports technical review, acceptance decisions, and comparative testing for these coatings.

Where is ASTM B799 used?

This standard is commonly used in coating evaluation workflows where gold or palladium finishes are applied and porosity must be checked. It may be used by laboratories, plating operations, quality teams, and manufacturers that rely on noble-metal coatings for performance-sensitive components. ASTM B799 is most relevant when the coated surface needs inspection for barrier integrity, especially in controlled testing environments where a defined vapor-based method is preferred for comparison and documentation.

Why is ASTM B799 important?

ASTM B799 matters because porosity can compromise the expected function of gold and palladium coatings. A consistent test method helps reduce uncertainty during inspection, supports procurement and acceptance criteria, and improves confidence in coating quality. It also gives buyers and suppliers a common reference for testing results, which can reduce disputes and improve repeatability. For product qualification and ongoing quality control, ASTM B799 helps turn coating assessment into a clearer, more defensible process.

• Porosity testing for gold and palladium coatings
• Sulfurous acid/sulfur-dioxide vapor method
• Coating integrity and quality control
• Support for acceptance and evaluation decisions
• Technical reference for coated-component testing