SiliaDry Desiccants Against Moisture
- Safe and eco-friendly material
- Wide range of pore and particle sizes
- Excellent adsorption capacity
- Different moisture indicator to signal when saturation is reached
- Inexpensive solution to protect your goods
SiliaDry desiccants draw in moisture but do not physically become wet. This is the reason they can quickly dehumidify environments, preserve metals and other stored goods.
Many believe heating your material will remove the threat of humidity, but this is more likely to yield an opposite effect: warmer air can hold more moisture and is therefore likely to release a greater deal of moisture.
Keep Your Goods Safe from Ambient Moisture
Desiccants are a powerful moisture-prevention tool of high safety used in various fields of our daily life as a strong adsorbent. It has an excellent adsorption capacity at low relative humidity for keeping materials dry and preventing rust.
Usual applications include, but are not limited to:
|Various uses for desiccants
|Research & Laboratories
- Laboratories desiccators
- Bulk & packaged medical gases
- Pharmaceutical stoppers
- Humidity-sensible reagents
|Industrial Equipment & Gases
- Hydrocarbon streams decontamination
- High purity industrial gases (O2, N2, H2, CO)
- Craked gases & olefin streams dehydration
- Natural Gas Processing
- Ethanol dehydration
- Air dryers
- Conditioning systems
- Photographic equipment
- Optical equipment
- Telecommunication equipment
- Decontamination of hydrocarbon streams in rafinery applications
|Coating, Sealants & Adhesives
- Paper manufacturing
|... And so much more
- Drying flowers
- Shipping containers
- Transformer tank breathers
- Clothing & leather goods
- Foods (dried seaweeds, salted meats)
- Insulated windows
Great and Effective Adsorption
Desiccants adsorb moisture from surrounding environments by capillarity. This method prevents the desiccant from physically changing during usage, allowing peak efficiency to be maintained for quite a while. This great effectiveness and adsorption quality makes this material useful for a very vast array of conditions and media.
Silica gel is an amorphous form of silicon dioxide, which is synthetically produced in the form of hard irregular granules that have the appearance of crystals or hard irregular beads. A microporous structure of interlocking cavities gives a very high surface area. It is this structure that makes silica gel a high capacity desiccant. Water molecules adhere to the gel surface because it exhibits a lower vapour pressure than the surrounding air.
When an equilibrium of equal pressure is reached, no more adsorption occurs. Thus the higher the humidity of the surrounding air, the greater the amount of water that is adsorbed before equilibrium is reached. It is in these higher humidity conditions (above 50 % relative humidity) that stored or in-transit items are susceptible to damage.
Approximately 40 g of desiccant will adsorb the moisture from three cubic feet of air.
Wide Choice of Packagings
SiliaDry desiccants come in either bulk (industrial, commercial and lab applications) or specialized bags and canisters that will not moisten nor break as the desiccant adsorbs moisture. Desiccant packs are made of Tyvek® (FDA approved) and laminated film to last for a lengthy period of time. Thus, you will never have to face bags bursting or spilling, which can happen with poor-quality or cheap containers.
Recycling of Desiccant
Heating drives off the adsorbed moisture of silica gel, and as it does so, the indicating desiccant will switch back to its original color. When drying objects, it is important to keep the container size small in relation to the object being dried. This helps ensure more rapid and thorough drying.
Typical regeneration procedure involves two hours of heating at 150°C (300°F) in an oven. Various conditions can be tested ranging from 150 to 200°C (300 to 400°F), for one to five hours, with or without rest.
Advantages of Silica Gel as a Desiccant
Silica gel has many other properties that make it a material of choice as a desiccant.
- It will adsorb up to one third of its own weight in water vapour. This adsorption efficiency is approximately 35 % greater that typical desiccant clays, making silica gel the preferred choice where weight or efficiency are important factors.
- It has an almost indefinite shelf-life if stored in airtight conditions.
- It can be regenerated and reused if required. Gently heating silica gel will drive off the adsorbed moisture and leave it ready for reuse.
- It is a very inert material, it will not normally attack or corrode other materials and with the exception of strong alkalis and hydrofluoric acid is itself resistant to attack. It is non-toxic and non-flammable.
- It is most frequently and conveniently used packed in a breathable sachet or bag. These are available in a wide range of sizes suitable for use with a wide range of applications.