Silica Gel, 1 Gr from Netherlands (SKU 1653)

Silica Gel 1g sachet. A perfect size for small containers.

A desiccant is a drying agent that is used to absorb moisture from the air inside moisture barrier bags. A desiccant absorbs moisture vapor (humidity) from the air left inside the barrier bag after it has been sealed. Any moisture that penetrates the bag will also be absorbed. A desiccant remains dry to the touch even when it is fully saturated with moisturevapor. Desiccant is sold by the “Unit” or fractional Unit, or in grams. One unit of desiccant will absorb a specific amount of moisture. A unit weighs about 33 grams.

To be used most effectively, desiccants should be used within a closed/sealed moisture barrier, or a rigid/sealed container. Humidity indicating cards are generally placed inside the container to show the humidity level and indicate when the desiccant needs to be replaced.

Available desiccant are Silica Gel and Bentonite (Natural clay). Uses of desiccant include the follwing: drying flowers, packaging and preserving of food, dried herbs and herb extracts during transportation and storage.

In other words:
A desiccant is a hygroscopic material (it will absorb water from the air). Desiccant bags are used to completely dry the air within a package or container during shipment or storage. The disposable packets are dust tight and will protect enclosures for many months when used within an adequate moisture barrier. It can also be used to dry out herbal preparations or extracts. One 35 gram unit of Clay desiccant can absorb more than 10 grams of water.

Clay desiccants:

Clay desiccants are non-hazardous, moisture adsorbent substances created by the controlled drying of a calcium (bentonite) aluminosilicate clay. This naturally occuring montmorillonite clay has a special affinity for moisture and is chemically inert and non-corrosive. The layered structure of clay desiccant attracts and adsorbs moisture onto its surface and between its layers. Desi Pak sachets will protect the contents of a properly sealed container during shipping and storage.

Clay is the least expensive of all desiccants and highly effective within normal temperature and relative humidity ranges. It is used in most industrial applications requiring humidity control. Clay can adsorb up to 28% of its weight in water vapor at 77°F (25°C) and 80% relative humidity. At full moisture vapor capacity, Desi Pak remains dry and free-flowing. There is no apparent change in size, shape, or texture of the desiccant.

Clay works satisfactorily below 120°F (49°C). Above 120°F (49°C), there is a possibility that the clay will give up moisture rather than pull it in (silica gel or molecular sieve are suitable for such temperatures). Accordingly, anticipated storage and transportation conditions should be considered when deciding whether or not to use clay.

Silica gel desiccants:

Silica gel is silicon dioxide (SiO2), an amorphous form of silica which is manufactured from sodium silicate and sulfuric acid. It is a naturally occuring mineral that is purified and processed into beaded or granular form. Like clay desiccant, silica gel is also non-corrosive and chemically inert. Much like a sponge, silica gel's interconnected pores form a vast surface area that will attract and hold water by adsorption and capillary condensation, allowing silica gel to adsorb about 40% of its weight in water vapor at 100% humidity.

As a desiccant, silica gel has an average pore size of 24 angstroms. Silica gel will pull in moisture at temperatures up to 220°F (104°C). As temperatures increase above 100°F (38°C) the rate of moisture pick-up will slow down, but the silica gel will still work. Silica gel performs best at room temperatures between 70°F to 90°F (21°C to 32°C) and at high humidity between 60% to 90% relative humidity.