Dry Pack
Packaging of 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
| K-TECH-Art.-Nr. | Material Code | Inner Dimensions mm | Application |
|---|---|---|---|
| K05204 | DY3008-106 | 400 x 480 | 13″ reels |
| K05211 | DY3008-106 | 254 x 710 | IC bars |
| 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.
Desiccants
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.
Comparison:
| 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.
