Dry Pack

Packaging Moisture-Sensitive Components

Many electronic components are sensitive to moisture. To protect them from damage during soldering, these components are dried by the manufacturer before shipping and then securely packaged to prevent moisture ingress. The JEDEC J-STD-033C standard defines methods for packaging, storage, and handling of moisture-sensitive components. Typically, these components are packaged in aluminum laminate bags along with a desiccant and a humidity indicator card, and then vacuum-sealed. They are shipped in a hinged-lid box (pizza box).

Moisture Barrier Bags, MBB (Aluminum Composite Bags)

  • Aluminum composite bags serve the following purposes:
  • Protection against moisture Protection against electrostatic discharge
  • Electromagnetic shielding

Standard materials available at K-TECH include:

Material Code Material Thickness MVTR 100 in2 / 24 h (nach ASTM-D-1249)
DY3008-652 91 µm < 0,02 g
DY3008-106 152 µm < 0,0003 g

The electrical and physical properties meet the requirements of the standards EIA-583, EIA-541, EIA-625, and MIL-PRF-81705 Type 1. To comply with the JEDEC J-STD-033C specifications, we recommend using the material DY3008-106.


Standard bags with ESD and moisture logos

Available Sizes:
K-TECH-Art.-Nr. Material Code Inner Dimensions mm Application
K05204 DY3008-106 400 x 480 13″-Spulen
K05211 DY3008-106 254 x 710 IC-Stangen
K05217 DY3008-106 254 x 500 Trays

Many more sizes are available from stock. Custom sizes and custom printing are possible with minimum order quantities.

For information on additional materials, please visit our supplier DOU YEE's website.



Bentonite, also known as drying clay, is a natural mineral with a layered structure. Water vapor is absorbed between these layers. Bentonite is an economical solution for normal ambient temperatures up to 50°C. At higher temperatures, the absorbed moisture is released. Bentonite can be regenerated with a drying temperature of 120°C.

Molecular sieves are zeolites with cavities of defined size. As a result, molecular sieves can selectively adsorb, meaning they take in only molecules of specific sizes while allowing others to pass through. Molecular sieves have excellent water absorption capabilities even at higher temperatures and lower relative humidity compared to bentonite and silica gel. In comparison to bentonite and silica gel, molecular sieves have a higher absorption capacity.



Properties Molecular Sieve Clay
Absorption capacity at low ambient humidity very high medium
Absorption capacity at 25°C / 40% relative humidity high medium
Absorption capacity at higher temperatures high low
Selective adsorption yes no

The measure of a desiccant's absorption capacity is TME (Desiccant Unit). According to DIN 55 473, a desiccant unit is the amount of desiccant that, in equilibrium with air at 23°C (± 2), adsorbs at least 6 g at 40% relative humidity.

Our desiccants from DOU YEE are manufactured according to JEDEC J-STD-033 and MIL-D-3464 standards.


Humidity Indicator Cards

Humidity indicator cards are indicators used to determine whether the critical humidity level has been reached or exceeded inside a package. Fields impregnated with special solutions change color based on the relative humidity of the surrounding air.

You can find an overview of our humidity indicator cards here.


Pizza Boxes (Hinged-Lid Boxes)

Corrugated cardboard 1.30b

Standard sizes in stock:

  • Type 1: 340 x 340 x 31
  • Type 2: 340 x 340 x 41
  • Type 3: 340 x 340 x 53

All measurements in mm.


Overview humidity indicator cards

Various humidity indicator cards

Pizza box

PDF brochure covering carrier tapes, cover tapes, plastic reels, and ESD packaging (German)

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