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2 / 7 page 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 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 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 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. |
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