ASTM B 845 Standard Guide for Mixed Flowing Gas (MFG) Tests for Electrical Contacts
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ASTM B 845 Document Information:
Title
Standard Guide for Mixed Flowing Gas (MFG) Tests for Electrical Contacts
ASTM International
Publication Date:
May 10, 1997
Scope:
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.
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.
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.
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 become familiar with all hazards
including those identified in the appropriate Material Safety Data
Sheet (MSDS) for this product/material as provided by the
manufacturer, to establish appropriate safety and health practices,
and determine the applicability of regulatory limitations prior to
use.
Keywords:
- accelerated test
- air velocity
- atmospheric corrosion
- chlorine
- connector
- corrosion
- corrosive gas testing
- electrical
- contacts
- environmental
- humidity
- hydrogen sulfide
- mixed
- flowing gas
- nitrogen dioxide
- pollutant
- reliability
- sulfur
- sulfur dioxide
- tarnish
- temperature
- testing
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