TB-2031 Page 2 of 7

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

© 2013 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

1.0

130 sq. in.

2.0

1.5

1.0

160 sq. in.

2.0

1.5

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

13868

13869

13870

Figure 5. Humidity Indicator Cards

Desiccant packs are available from Desco in the

following unit sizes and standard packages:

Item #

Unit Size

Std. Package

13840

1/2 unit - 1.5" x 3"

Box of 700

13843

1 unit - 2" x 4"

Box of 450

13844

1/2 unit - 2" x 4"

Pail of 300

13850

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

Drawing

13850.

HUMIDITY INDICATOR CARDS

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

13868

2" x 3"

125 pcs/can

5/10/15

13869

2" x 3"

125 pcs/can

5/10/60

13870

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

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

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.