Certain plastic encapsulated surface mount devices (SMDs), if not handled properly, can incur damage during the solder reflow attachment process to printed circuit boards (PCBs). In order to prevent damages, the moisture sensitive product is typically baked before packing. After baking, the product is placed inside a DryPack bag along with predetermined amount of desiccant and a humidity sensitive indicator card (refer to JEDEC J-STD-033C). The vacuum sealed bag is labeled and placed in a pizza box carton.

DryPack bag with plastic reel
DryPack bag with plastic reel

Moisture Barrier Bags, MBB

MBB are designed to protect components against

  • moisture
  • electrostatic charge
  • electromagnetic fields
At K-TECH, we offer the following standard materials (others on request):
Material code Thickness MVTR 100 in2 / 24 h (nach ASTM-D-1249)
DY3008-652 91 µm < 0.02 g
DY3008-106 152 µm < 0.0003 g

Electrical and physical properties are complying with the standards EIA-583, EIA-541, EIA-625, and MIL-PRF-81705 type 1. In order to meet JEDEC J-STD-033C, we recommend material DY3008-106.

Bags with a Moisture and ESD Logo

Available sizes:
K-TECH p/n Material code Inner dimension in mm Application
K05204 DY3008-106 400 x 480 13″
K05211 DY3008-106 254 x 710 IC
K05217 DY3008-106 254 x 500 Trays

Many other sizes are available from stock. Custom sizes and custom printing can be done on request.

For further information please contact K-TECH or visit the website of our supplier DOU YEE.


Bentonite clay is a natural mineral and has a layer-shaped construction. The moisture is absorbed between these layers. Bentonite clay is an economic solution for temperatures up to 50 °C. When temperatures rise above 50 °C, benonite clay releases the moisture it has absorbed back to the air. With baking at a temperature of 120 °C, this desiccant can be reactivated to be reused.

Zeolite molecular sieves are crystalline, highly porous materials, which belong to the class of aluminosilicates. As part of the manufacturing process, the pore size on the molecular sieve particles can be controlled. This allows a selective adsorption of a wide range of organic molecules as well as moisture.

Molecular sieves properties differ from clay and silica gel in a number of ways:

  1. They adsorb moisture more rapidly.
  2. They will reduce moisture to much lower levels, making their use essential when a very dry product or atmosphere is required.
  3. They perform more effectively as moisture adsorbers at higher temperatures.
Property Molecular sieve Clay
Adsorptive capacity at low concentrations excellent fair
Adsorptive capacity for water 25 °C, 40 % RH high medium
Adsorptive capacity at high temperatures high poor
Separation by molecular sizes yes no

The German standard DIN 55473 only allows for the description in desiccant units. One desiccant unit is equal to the amount of a drying agent capable of adsorbing a minimum of 6 g at 40 % relative humidity of water vapor at an air temperature of 23 °C (±2).

All desiccant manufacturing by Dou Yee is compliance to JEDEC J-STD-033 and MIL-D-3464 standard.

Indicator Cards (HIC)

A humidity indicator card (HIC) is a card on which a moisture-sensitive chemical is impregnated such that it will change color when the indicated relative humidity is exceeded. This is an economical way to quantify relative humidity levels inside sealed packaging like moisture barrier bags.

An overview of our humidity indicator cards you can find here (German).

Overview humidity indicator cards (HIC)
Overview humidity indicator cards
Humidity indicator cards (HIC)
Various humidity indicator cards

Pizza Boxes

Corrugated card board 1.30b

Standard sizes available from stock:

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

(all dimensions in mm)

Pizza box
Pizza box
Moisture barrier bag with tray
Moisture barrier bags, MBB


Brochure Tape & Reel as PDF (German)
PDF brochure covering carrier tapes, cover tapes, plastic reels, and ESD packaging (German)

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