MIL-DTL-19648E
6.6 Environmentally preferable material. Environmentally preferable materials should be used to the
maximum extent possible that the material meets or exceeds the operational and maintenance
requirements, and promotes economically advantageous life cycle costs. Table XI lists the Environmental
Protection Agency (EPA) top seventeen hazardous materials targeted for major usage reduction. If any
of these hazardous materials are required, it is recommended that it be used only when other materials
cannot meet performance requirements.
Table XI. EPA top seventeen hazardous materials.
Benzene
Dichloromethane
Tetrachloroethylene
Cadmium and compounds
Lead and compounds
Toluene
Carbon tetrachloride
Mercury and compounds
1,1,1 - Trichloroethane
Chloroform
Methyl ethyl ketone
Trichloroethyene
Chromium and compounds
Methyl isobutyl ketone
Xylenes
Cyanide and compounds
Nickel and compounds
6.7 Glossary. The definitions listed below are not a complete glossary of relay terminology, but rather
are intended as definitions of the technical terms as applied within this specification.
6.7.1 Rated heater voltage (see 3.4.1.1). Rated heater voltage is that voltage at which the relay is
designed to operate; that is, the voltage required in the heater element to cause the relay to perform its
operation in the time delay specified in the specification sheet.
6.7.2 Normal operate time (see 3.6.2). Normal operate time is the time interval between applying
power at nominal voltage to the energizing heater, starting with all elements of the relay substantially at
ambient temperature, and electrically closing normally open (NO) contacts (including contact bounce
time) or electrically opening normally closed (NC) contacts.
6.7.3 Normal operate time tolerance (see 3.6.2.1). Normal operate time tolerance is the tolerance
applied when the operating time is measured to nominal voltage with the relays stabilized at room
ambient.
6.7.4 Minimum operate voltage (see 3.6.3). Minimum operate voltage is the minimum value of voltage
at which the relay will operate in not more than four times normal operate time, and remain operated.
6.7.5 Minimum hold-in voltage (see 3.6.3). Minimum hold-in voltage is the minimum value to which the
heater voltage can be reduced after saturation at rated voltage, for which the contacts will always
maintain their energized positions.
6.7.6 Nonstandard relays (see 4.5). Nonstandard relays are relays not covered by specification
sheets.
6.7.7 Instant release time (see 4.7.3.4.1). Instant release time is the time interval, after cutting off
power to the energizing heater at the instant of the end of operate time, until normally open contacts
reopen or normally closed contacts reclose and all contact bounce has ceased.
6.7.8 Saturate release time (see 4.7.3.4.2). Saturate release time is the time interval, after cutting off
power to the energizing heater at saturation at rated heater voltage until normally open contacts reopen
or normally closed contacts reclose and all contact bounce has ceased.
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