ASTM G140 is the standard test method for determining atmospheric chloride deposition rate by wet candle method. It provides a practical way to measure chloride deposited from the atmosphere onto a surface, helping users assess environmental exposure conditions with a consistent test approach. This is useful when chloride contamination may affect corrosion performance, material durability, or site selection decisions. ASTM G140 supports more reliable comparison of exposure data across locations and time periods.

What is ASTM G140?

ASTM G140 defines a test method used to determine atmospheric chloride deposition rate using the wet candle method. In simple terms, it addresses how chloride from the air can be collected and measured in a controlled way. The standard is intended to give users a repeatable technical basis for evaluating chloride deposition rather than relying on informal observation. As an ASTM standard, it is commonly used where environmental chloride monitoring is relevant to materials performance and exposure assessment.

Where is ASTM G140 used?

ASTM G140 is commonly used in environments where chloride deposition is a concern, especially for exposure monitoring near marine or salt-influenced locations. It may be used in corrosion-related testing programs, field surveys, and site evaluations where chloride loading can affect metals, coatings, or other materials. The wet candle method is suited to practical monitoring workflows that need a standardized way to collect atmospheric chloride data for comparison, reporting, or ongoing quality control.

Why is ASTM G140 important?

ASTM G140 matters because chloride deposition can influence material selection, service life, and corrosion risk. Using a recognized test method helps improve consistency in data collection and makes results easier to compare across projects or locations. For procurement, engineering review, and quality control, the standard supports clearer technical communication and more dependable environmental assessment. ASTM G140 also helps reduce uncertainty when chloride exposure is part of product evaluation or field monitoring.

• Wet candle chloride deposition measurement
• Atmospheric exposure monitoring
• Corrosion-related site assessment
• Consistent field data collection
• Comparative environmental testing