ASTM B845-97(2013)e1
Standard Guide for Mixed Flowing Gas &40;MFG&41; Tests for Electrical Contacts

Standard No.

ASTM B845-97(2013)e1

Release Date

1997

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM B845-97(2013)e2

Latest

ASTM B845-97(2018)

Scope

4.1 Preservation of a conducting surface on electrical contact is vital to the continued functioning of such contacts. Contamination of the surface with insulating layers formed by corrosion processes is one potential hazard. Laboratory testing of contacts in MFG tests is used to assess the effectiveness of design features and materials.

4.2 MFG tests are used in development studies of processes and materials for contacts. For example, coupon specimens may be exposed to MFG tests to evaluate new contact materials, layers of new coating materials on a supporting substrate, reduced coating thicknesses, or protective surface treatments.

4.3 MFG tests are also employed to test the durability of a finished product with respect to atmospheric corrosion. For example, finished connectors may be exposed to a MFG test and their performances compared against each other or against a set of fixed requirements. Relays or switch contacts may be exposed in the operated and non-operated conditions to compare performance.

4.4 MFG tests are useful for determining the effectiveness of connector housings and shrouds as barriers to ingress of atmospheric corrodants to the contact surfaces. These tests can also be used to assess the screening of the metal-to-metal contact areas of mated connectors.

4.5 MFG tests are employed as qualification tests to determine connector failure rates in application environments for which correlation between test and application has previously been established.

4.6 This guide provides test conditions which are to be applied in conjunction with Practice B827 which defines the required test operation and certification procedures, tolerances, and reporting requirements. Where the test specifier requires certifications or tolerances different than those provided in Practice B827, the required certifications or tolerances shall be part of the test specification. Differences from the specifications in Practice B827 shall be reported in the test report provided by the test operator to the test specifier. Specification of one of the test conditions defined in this document in the form of a statement such as, “Parts shall be tested in accordance with ASTM B845 Method Z.”, implicitly requires test condition, Z, applied according to Practice B827.

1.1 The techniques described in this guide pertain to mixed flowing gas (MFG) tests containing species that are applied to evaluate devices containing electrical contacts such as slip rings, separable connectors, electromechanical relays or switch contacts. These techniques may be relevant to other devices, but it is the responsibility of the user to determine suitability prior to testing.

1.2 The MFG tests described in this guide are designed to accelerate corrosive degradation processes. These accelerations are designed such that the degradation occurs in a much shorter time period than that expected for such processes in the intended application environment of the device being tested. A......

ASTM B845-97(2013)e1 Referenced Document

• ASTM B542 Standard Terminology Relating to Electrical Contacts and Their Use*， 2019-11-01 Update
• ASTM B808 Standard Test Method for Monitoring of Atmospheric Corrosion Chambers by Quartz Crystal Microbalances
• ASTM B810 Standard Test Method for Calibration of Atmospheric Corrosion Test Chambers by Change in Mass of Copper Coupons*， 2022-04-01 Update
• ASTM B825 Standard Test Method for Coulometric Reduction of Surface Films on Metallic Test Samples
• ASTM B826 Standard Test Method for Monitoring Atmospheric Corrosion Tests by Electrical Resistance Probes
• ASTM B827 Standard Practice for Conducting Mixed Flowing Gas (MFG) Environmental Tests

ASTM B845-97(2013)e1 history

• 2018 ASTM B845-97(2018) Standard Guide for Mixed Flowing Gas (MFG) Tests for Electrical Contacts
• 2013 ASTM B845-97(2013)e2 Standard Guide for Mixed Flowing Gas (MFG) Tests for Electrical Contacts
• 1997 ASTM B845-97(2013)e1 Standard Guide for Mixed Flowing Gas &40;MFG&41; Tests for Electrical Contacts
• 1997 ASTM B845-97(2013) Standard Guide for Mixed Flowing Gas (MFG) Tests for Electrical Contacts
• 1997 ASTM B845-97(2008)e2 Standard Guide for Mixed Flowing Gas (MFG) Tests for Electrical Contacts
• 1997 ASTM B845-97(2008)e1 Standard Guide for Mixed Flowing Gas (MFG) Tests for Electrical Contacts
• 1997 ASTM B845-97(2003) Standard Guide for Mixed Flowing Gas (MFG) Tests for Electrical Contacts
• 1997 ASTM B845-97 Standard Guide for Mixed Flowing Gas (MFG) Tests for Electrical Contacts