ZZ-T-391E
-
These tires shall be compounded to not leave
Nonmarking.
Code
green
(e)
discoloring
residual
surface
marks
on
floors
l
nd
operating
surfaces that cannot be removed by rubbing with dry fingers
when
tested l s specified in 3.4.4.
These tires shall resist the effects of expo-
(f)
Code
purple
- Ozone
resisting.
sure to ozone atmosphere to the extent that no cracks shall be
specimen w h e n examined under 7-power magnification
evident in the
after being tested as specified in 3.4.5.
tires shall resist the effect of exposure
- Heat resisting.
These
Code
brown
(g)
to
all
heated
surfaces
and
ambient
temperatures
within
a
range
from +225° to at least -25°F.
specimens shall not harden in
The
excess of 135 percent of the original hardness specified in
Table I, when tested as specified in 3.2.4, and shall remain
suitable for the intended use when tested as specified
in
3.4.6.
These tires shall resist the
Code
orange
-
Low temperataure resisting (Arctic).
(h)
effect of exposure to
all
ambient
temperatures
within
a
range
from +120° to -65°F.
T h e specimens shall
not
crack
when
tested
as specified in 3.4.7.
When
special
compound tires other than code
Compound Code Tire Tests.
red or
3. 4.1
code blue tires a r e
specified
1.2.2
and
6 . 2 ) , these special compound tires
shall be
tested
as
follows.
Code Yellow, Oil Resisting Tires.
The tires shall be tested in accordance with
3.4.2
Fed. Test Method Std. No. 601, method 6211, for 70 hours at 212°F, using medium No. 3 as
specified
in
Fed. Test Method No. 601, method 6001.
N o n c o n f o r m a n c e to (3.4c) shall
constitute failure of this test.
The tires shall be
tested
for direct
Code
White,
Static
Conductive
Tires.
3.4.3
as specified in Fed. Test Method Std. No. 601,
current
resistivity
method
91111.
Nonconformance to (3.4d) shall constitute failure of this test.
The tires shall be vertically loaded to not less
3.4.4
Code
Green,
Nonmarking
Tires.
than 20 percent of the T&RA rated loaded, and rolled over a smooth wooden surface for
not less than a 5-foot distance at a slip angle offset not leas than 20", either side,
from the direction of travel.
N o n c o n f o r m a n c e to (3.4e), shall
constitute
failure
of
this test.
2.4.5
The tires shall be subjected to the test
Code Purple, Ozone Resisting Tires.
for ozone resistance specified in MIL-STD-617, under suffix C2, in Table II.
Air con-
d i t i o n s during test
shall
provide
minimum
airflow
across
the
specimens
of
4.5
cubic
feet
per minute with a minimum air velocity of 2 linear feet per minute.
Nonconformance
to
(3.4f)
shall
constitute
failure
of
this
test.
not less
tires shall
be
conditioned
at
3.4.6
Code Brown, Heat Resisting Tires.
The
than 225°F for not less than 22 hours and then tested as specified in (3.2.4).
The
tires shall then be tested as specified in MIL-STD-417, suffix F-1, except that the
lower
temperature shall be minus 25°F in lieu of minus 40°F.
The solenoid or motor-
driven
impact apparatus
conforming
to
Fed.
Test
Method
Std.
No. 601, method 5321 or 5311
Nonconformance to (3.4g) shall constitute failure of this test.
shall be used.
3.4.7 Code
The tires shall be subjected to
Orange,
Low
Temperature
Resisting
Tires.
the low temperature brittleness
test
specified
in
Fed.
Test
Method
Std.
No.
601,
method
methanol or ethanol for the heat-transfer medium.
5311, using
Nonconformance
to
(3.4h)
shall
constitute
failure
of
this
test.
5
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