Q：What is a desiccant and what does it do?
A：A desiccant is a hydrating agent which attracts moisture from the atmosphere. It adsorbs and holds particles of water to itself by physical bonds or absorbs H2O to itself which is chemically integrated into another. <

Q：What are the major types of desiccants?
A：At present, there are five typical desiccants:
1) Silica gel
Silica gel is silicon dioxide. It is a naturally occurring mineral that is purified and processed into either granular or beaded form. As a desiccant, it has an average pore size of 2 angstroms and has a strong affinity for moisture molecules. Silica gel performs best at room temperature(20~32℃) and high humidity(60~90%). It will drop the relative humidity in a container down around 40% RH.
2) Montmorillonite Clay
Its appearance is that of small gray pellets. Clay is a good basic desiccant that works satisfactorily below 50℃. Above 50℃, there is a possibility that the clay will give up moisture rather than pulling it in. The upside to clay is that it is normally the least expensive desiccant.
3) Molecular sieve
Molecular sieve is a synthetic desiccant that has a very strong affinity for moisture molecules. The pore size on the molecular sieve particles can be controlled by different manufacturing process. It can be used for picking up specific gases as well as moisture. Molecular sieve can hold moisture to temperatures well past 450°F (230°C). Because of its high affinity for moisture, molecular sieve is able to bring the relative humidity in packages down as low as 10% RH.
4) Mineral Desiccant
Hengyuan mineral desiccant is composed by several natural minerals. The appearance of it is offwhite globule. Mineral desiccant is degradable and environmentally-friendly product, the moisture adsorption rate is over 50%, twice of that of common silica gel.
5) Fiber Desiccant
Hengyuan fiber desiccant is refined by natural plant fiber through special technology. The fiber desiccant sheet is covered by PET film, convenient in use and not taking up space. Its moisture adsorption capacity reaches 100% of its own weight, far surpassing that of tradtional silica gel. In addition, the product is safe and secure, especially meeting requirements of bio-material, medical and health-care food.

Q：What size desiccant do I need?
A：The answer to the size of desiccant needed depends on the size of the air space to be desiccated, the nature of the material in the package, the moisture barrier surrounding the package, the moisture barrier surrounding the package, the atmosphere conditions where the package is sealed, the desired shelf life, the type of seal on the package, etc. When we design the sizes of desiccant for customers, we will ask a number of questions to determine this information so we can calculate what size desiccant will work best in a particular application.

Q：What is saturation and equilibrium capacity?
A：Although technically they are different situations, for most practical purposes these two terms cover the point at which a desiccant no longer adsorbs moisture. Saturation is when the desiccant is full and even if there were moisture molecules to pick up, the desiccant could not do it. Equilibrium capacity is when the desiccant has pulled so much moisture out of the air that the air retains a stronger hold on the moisture molecules than the desiccant can exert. At equilibrium capacity, adding more desiccant will not bring the Relative humidity any lower.

Q：Who are our customers?
A：Pharmaceutical and Vitamin Packaging, Food packaging, Electronic Products, Metal Parts, Computers, Leather Products, Shipping Container and so on.

Q：What does a unit refer to?
A：According to the adsorption capacity of desiccant products, a “Unit” is the quantity of desiccant which will adsorb 3.00 grams of water vapor at 20% relative humidity or 6.00 grams of water vapor at 40% relative humidity. More precisely, a “Unit” of Clay is typically 33 grams, and a “Unit” of Silica gel and Molecular sieve is typically 28 grams.