ASTM-B845 1997

$44.96

B845-97 Standard Guide for Mixed Flowing Gas (MFG) Tests for Electrical Contacts

Published By	Publication Date	Number of Pages
ASTM	1997	11

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Category: ASTM

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Description

ASTM B845-97

Historical Standard: Standard Guide for Mixed Flowing Gas (MFG) Tests for Electrical Contacts

ASTM B845

Scope

1.1 The techniques described in this guide pertain to mixed flowing gas (MFG) tests containing corrosive 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. Application environments can vary continuously from benign to aggressively corrosive. Connectors and contacts within closed electronic cabinets may be affected by an environment of different severity than the environment on the outside of such cabinets. In general, indoor environments are different than outdoor environments. The MFG tests described herein, being discrete embodiments of specific corrosive conditions, cannot be representative of all possible application environments. It is the responsibility of the test specifier to assure the pertinence of a given test condition to the specifier’s application condition.

1.3 The MFG tests described herein are not designed to duplicate the actual intended application environment of the device under test. An extended bibliography, Section 10, that provides information which is useful to test specifiers to assist them in selecting appropriate test methods is included in this guide. The bibliography covers the scope from application condition characterization, single and multiple gas effects, and material and product effects to key application and test variables as well as discussions of atmospheric corrosion processes.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Keywords

Accelerated aging/testing-electrical heating/contact materials; Air velocity; Velocity; Mixed flowing gas (MFG); mixed flowing gas (MFG) tests-electrical contacts; Pollutant; Reliability; Sulfur; Sulfur dioxide; Tarnish; Temperature; Testing

ICS Code

ICS Number Code n/a

DOI: 10.1520/B0845-97

Additional information