Blue, Orange Silica Gel Packets Important for Gas Drying

Silica Gel in Drying of Gases

While Silica Gel is mostly known for removing humidity from packed spaces, it has various other uses as well. One of the important uses of Silica Gel is in the successful removal of moisture molecules from gases and liquids. Both of these are very vulnerable to moisture and are greatly affected by it. Companies working in the gas and liquid field make wide use of Silica Gel sachets to keep humidity at bay. Utmost care should be taken that there are no traces of moisture in gases/liquids as it adversely affects their use and movement from one place to another. 

All over the world, Silica Gel is the first choice to remove moisture from gas and liquid streams. This is due to two factors- 1) large surface area of the Silica Gel molecules and 2) high rate of absorption. These characteristics help Silica Gel desiccant absorb more humidity in lesser time from natural gas and various other industrial gases. Silica Gel desiccant is also widely used in the hydrocarbon recovery process and the mass dehydration of compressed air.

Blue & Orange Indicating Silica Gel in Gas Drying

Based on its ability to absorb moisture, Silica Gel is divided into different categories/grades. It can be classified into Indicating (changes colour) and Non-Indicating (no colour change). The Indicating Silica Gel, in turn, can be found in Blue, Orange, Pink colours. These change colour when they become completely saturated with moisture. Blue and Orange grades of Indicating Silica Gel are mainly used to remove moisture molecules present in air/gases. This is applicable for both the static as well as dynamic situations. The colour change in both Indicating Silica Gel types will let one know when the Silica Gel adsorbent becomes fully saturated and when it needs to be replaced.

Silica Gel Orange

Orange Indicating Silica Gel packets change into dark green and becomes colorless as well. In the first case, the Silica Gel packets change color from a very bright orange (a dry state) to a dark green ( nearing saturation). When the Orange Indicating Silica Gel packets turn completely green, then it is understood that it can no longer absorb any more moisture. 
 
Silica Gel Orange is known to contain iron salts and changes colour from a deep orange (dry state) to a colorless state, when all the moisture has been already absorbed. Orange Indicating Silica Gel packets are available as granules and beads.

Silica Gel Blue

Blue Indicating Silica Gel Packets contain cobalt and is sometimes considered poisonous. The Blue Indicating Silica Gel desiccant changes color from blue to pink, going from a dry state to a fully saturated state. It is available in 2 or 3-6 mm granular forms. 

Humidity Indicator Cards Show Appropriate Moisture Levels

What are Humidity Indicator Cards?
The presence of moisture/humidity can prove to be very harmful for dpacke products. If the packages contain very high levels of humidity it will react negatively with the packed goods. Humidity can ruin the products and bring about various physical as well as chemical changes in them. It is in order to prevent such happenings that companies make use of different objects, which give indications about the humidity levels in packages. Once these indicators are in place, one can easily control the moisture content present in closed spaces. Some of the commonly used moisture indicators are Silica Gel, Activated Alumina and Humidity Indicating Cards.
Humidity indicating Cards, as the name suggests, are cards containing a moisture-sensitive chemical, which changes colour when the prescribed humidity levels are exceeded. The color change will let one know if the humidity levels in the packages are at the permissible level or not. The moisture-sensitive paper usually used in the Humidity Indicating Cards contain cobalt(II) chloride base or the lesser toxic copper(II) chloride base. Whenever excess moisture levels are reached, these Indicating Cards will change colour to show the same. These cards enjoy wide popularity among companies as they are one of the easiest methods of knowing humidity levels.

Functioning of Humidity Indicating Cards Explained
The Humidity Indicating Cards work in a very simple manner. They are not actual absorbers of moisture, just indicators of whether the humidity is at the optimum levels. When the Humidity Indicating Cards show that higher moisture levels are reached, it is an indication that the adsorbents present in the closed spaces are saturated and need to be replaced. 

When the Humidity Indicating Cards come in contact with the moisture, they will respond as per their various sensitive spots. Different moisture levels will affect different moisture spots and each will react in a different manner to show various moisture levels. The colour changes can be in various shades- blue to pink and vice versa, green, orange and white. The colour white usually indicates that all the moisture has been removed from the packages. It clearly shows that the molecular absorbents placed inside have reached their saturation point and need to be replaced as soon as possible. This is the biggest advantage of using Humidity Indicating Cards.
In India, one can buy High Quality Humidity Indicating Cards from one of the best suppliers of Humidity Indicating Cards, Sorbead India. The company is the leading supplier of adsorbents and other humidity controlling objects not just in India, but the whole of Asia.