ASTM B117: which instrument fits and how to decide

The Salt Spray Tester (TNG1124) is the appropriate instrument for compliance with ASTM B117, as it meets the required specifications for test chamber size, temperature control, and solution volume.

Matching Instrument Specifications to ASTM B117 Requirements

ASTM B117 is a widely recognized standard for evaluating the corrosion resistance of materials through salt spray testing. To ensure accurate and reproducible results, the instrument must align with the standard's specific requirements. The Salt Spray Tester (TNG1124) is designed to meet these demands by providing precise temperature control and a controlled test environment. The test chamber size of 108 L or 270 L ensures sufficient volume for consistent exposure, while the test solution volume of 15 L supports adequate saturation of the chamber. These specifications are critical for maintaining uniform conditions throughout the test, which is essential for reliable data collection.

Temperature Control and Environmental Stability

Temperature control is a key factor in salt spray testing, as it directly affects the rate and type of corrosion. The TNG1124 offers temperature settings that align with both NSS (Neutral Salt Spray) and CASS (Copper Accelerated Salt Spray) methods. For NSS testing, the temperature of the test solution is maintained at 35℃±1℃, while the air temperature is set to 47℃±1℃. These values are in line with ASTM B117 requirements, ensuring that the test environment remains stable and replicable. The optional CASS mode allows for higher temperatures of 50℃±1℃ for the solution and 63℃±1℃ for the air, which is necessary for more aggressive corrosion testing. This flexibility ensures that the instrument can accommodate a range of testing scenarios as specified by the standard.

Chamber Dimensions and Operational Efficiency

The internal dimensions of the TNG1124, such as 600x450x400 mm or 900 x600x500 mm, are designed to provide ample space for test specimens while maintaining controlled environmental conditions. The external dimensions, including 1060X570X1060 mm or 1420 x 980X1285 mm, ensure that the instrument is suitable for installation in various laboratory settings. The 108L model, with external dimensions of 1110*560*1100 mm, is particularly useful for laboratories requiring compact yet efficient testing equipment. These dimensions are important for ensuring that the test chamber can accommodate the required number of specimens and maintain uniform exposure conditions, which is essential for accurate results.

Conclusion and Instrument Selection

Selecting the correct instrument for ASTM B117 testing requires careful attention to specifications such as test chamber size, solution volume, and temperature control. The TNG1124 Salt Spray Tester meets all these requirements, making it a suitable choice for laboratories conducting corrosion testing. Its ability to maintain precise environmental conditions and support both NSS and CASS methods support testing to the standard and the reliability of test results.

Instrument models referenced

• TNG1124 Salt Spray Tester (Others). Published specifications include Test chamber: 108 L or 270 L; Test solution volume: 15 L; Temp. test: NSS.ACSS 35℃±1℃, optional CASS 50℃±1℃.