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Mixed flowing gas (MFG) is a type of laboratory environmental testing for products, particularly electronics, to evaluate resistance to corrosion due to gases in the atmosphere. Mixed Flowing Gas (MFG) test is a laboratory test in which the temperature (°C), relative humidity (%RH), concentration of gaseous pollutants (in parts per billion, ppb or parts per million ppm level), and other critical variables (such as volume exchange rate and airflow rate) are carefully defined, monitored and controlled. The purpose of this test is to simulate corrosion phenomenon due to atmospheric exposure. The electronic product is exposed to gases such as chlorine, hydrogen sulfide, nitrogen dioxide, and sulfur dioxide at levels in the parts per billion range, in a controlled environmental chamber. Test samples that have been exposed to MFG testing have ranged from bare metal surfaces, to electrical connectors, and to complete assemblies. In regards to noble metal plated connector applications, MFG testing has been widely accepted as a qualification test method to evaluate the performance of these connectors. ==Industry specifications== # ASTM B827-97—Standard Practice for Conducting Mixed Flowing Gas Environmental Tests # ASTM B845-97—Standard Guide for Mixed Flowing Gas Tests for Electrical Contacts # ASTM B810-01a—Standard Method for Calibration of Atmospheric Corrosion Test Chambers by Change in Mass of Copper Coupons # ASTM B825-97—Standard Test Method for Coulometric Reduction of Surface Films on Metallic Test Samples # ASTM B826-97—Standard Test Method for Monitoring Corrosion Tests by Electrical Resistance Probes # ASTM B808-97—Standard Test Method for Monitoring of Atmospheric Corrosion Chambers by Quartz Crystal Microbalances # EIA 364, Test Procedure 65A # IEC 60068-2-60 # IEC 512-11-7 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mixed flowing gas」の詳細全文を読む スポンサード リンク
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