TB-2031 Page 2 of 4
DESCO WEST
- 3651 Walnut Avenue, Chino, CA 91710 (909) 627-8178
DESCO EAST
- One Colgate Way, Canton, MA 02021-1407 (781) 821-8370 Web Site:
Desco.com 2014 DESCO INDUSTRIES INC.
Employee Owned
Figure 4. Desiccant packs
In order to provide a complete moisture barrier
packaging system, desiccant must be inserted into
the bag, prior to having the bag vacuum sealed. The
recommended amount of desiccant is dependent
on the interior surface area of the bag to be used.
Figure 5 is a reference table indicating recommended
minimum amounts of desiccant that should be used
with Moisture Barrier Bags.
INTERIOR BAG
NUMBER OF DESICCANT UNITS
SURFACE AREA
*MIH <20%
MIH <30%
MIH < 40%
100 sq. in.
1.5
1.0
130 sq. in.
2.0
1.5
1.0
160 sq. in.
2.0
1.5
200 sq. in.
2.5
2.0
1.5
240 sq. in.
3.0
2.0
1.5
290 sq. in.
4.0
2.5
2.0
340 sq. in.
4.5
3.0
2.5
390 sq. in.
5.0
3.5
2.5
450 sq. in.
5.5
4.0
3.0
510 sq. in.
6.5
4.5
3.5
580 sq. in.
7.5
5.0
4.0
650 sq. in.
8.0
5.5
4.0
720 sq. in.
9.0
6.0
4.5
Figure 5. Table for recommended desiccant usage.
Information taken out of EIA-583, Table 1, Page 8
Figure 5. Humidity Indicator Cards
Desiccant packs are available from Desco in the
following unit sizes and standard packages:
Item #
Unit Size
Std. Package
1/2 unit - 1.5" x 3"
Box of 700
1 unit - 2" x 4"
Box of 450
1/2 unit - 2" x 4"
Pail of 300
1/2 unit - 1.5" x 3"
Pail of 550
Desiccant packs sold by Desco meet the requirements
of MIL-D-3464. For more detailed information, see
HUMIDITY INDICATOR CARDS
Humidity Indicator Cards contain chemically
impregnated, humidity sensitive, indicating spots that
will change color with moisture. The comparison bar is
used to determine relative humidity of air. Select the
indicating spot that most closely matches the color of
the comparison bar. The measured relative humidity
is the percentage indicated on the matching spot. The
chemical reaction of the indicating spots is completely
reversible; the spots will continue to change color as
the moisture levels change.
Item#
Card Size
Std. Package
Relative Humidity
2" x 3"
125 pcs/can
5/10/15
2" x 3"
125 pcs/can
5/10/60
2" x 3"
100 pcs/can
10/20/30/40
COBALT-DICHLORIDE FREE
HUMIDITY INDICATOR CARDS
Cobalt-Dichloride Free Humidity Indicator (HI) Cards
provide electronic and semiconductor manufacturers
with a JEDEC complaint humidity indicator card that is
free of Cobalt-Dichloride, a chemical regulated under
European Chemical Bureau (ECB) REACH-directives.
*MIH - Maximum Interior Humidity.
Dry Packing Information
The Statshield Moisture Barrier Bag, Desiccant Packs
and Humidity Indicator Cards have been developed for
use in “DRY PACKAGING” applications. In order for
the MBB bag and its accessories to perform properly,
Desco recommends the user follow procedures defined
in IPC/JEDEC J-STD-033B.
DESICCANT
Desiccant
is a drying agent used to lower the moisture
content of air within a closed space, such as a
sealed Moisture Barrier bag. Desiccant is packaged
in fractional units in order to facilitate its usage with
a variety of bag sizes. One full “unit” of packaged
desiccant will absorb the following quantities of water
at equilibrium with air at 77°F (25°C): 3.00 grams @
20% rH and 6.00 grams @ 40% rH, when tested to
MIL-D-3464.