Desiccants
Desiccants
Desiccants (/dɪˈsɪkənts/) are substances that are used to induce or sustain a state of dryness (desiccation) in its vicinity. They are hygroscopic substances that create or maintain a state of dryness (desiccation) in its vicinity. Commonly encountered pre-packaged desiccants are solids that absorb water.
Etymology
The term "desiccant" comes from the Latin word "desiccare", which means "to dry up".
Types of Desiccants
There are several types of desiccants that are commonly used in various industries. These include:
- Silica Gel: This is perhaps the most commonly used desiccant. It is a form of silicon dioxide, which is a naturally occurring mineral.
- Calcium Sulfate: This is a common desiccant used in the packaging industry. It is a white crystalline solid that is odorless and tasteless.
- Activated Alumina: This is a desiccant made from aluminum hydroxide. It is highly porous and can absorb a large amount of moisture.
- Molecular Sieves: These are materials with tiny, uniform pores that can trap moisture molecules. They are often used in the petroleum industry.
Uses of Desiccants
Desiccants are used in a wide range of applications. Some of the most common uses include:
- Food Packaging: Desiccants are often used in food packaging to help keep products dry and extend their shelf life.
- Pharmaceuticals: In the pharmaceutical industry, desiccants are used to keep medications dry and prevent them from degrading.
- Electronics: Desiccants are used in the packaging of electronics to prevent moisture damage.
- Chemical Industry: In the chemical industry, desiccants are used to remove moisture from certain processes.
Related Terms
- Hygroscopy: The ability of a substance to attract and hold water molecules from the surrounding environment.
- Humidity Indicator Card: A card that changes color to indicate the levels of humidity in a sealed package.
- Oxygen Absorbers: Substances that absorb oxygen and are often used in conjunction with desiccants.
External links
- Medical encyclopedia article on Desiccants
- Wikipedia's article - Desiccants
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