what is a unit desiccant
Mil-D-3464E is the U.S. military specification for silica gel and clay desiccants. It includes requirements for the desiccant performance and packaging, as well as specific test procedures. Desiccant Bags are desiccants that are packaged in porous materials such as Kraft Paper or Tyvek. Desiccant bags absorb moisture, odors and chemicals to preserve and protect your products such as semiconductors, electronics, cartons of food, and all types of machinery.
A “Unit” refers to the Military Specification for packaging of desiccants . The term unit is a quantity of desiccant, which will absorb a set percentage of its weight at certain levels of humidity.
Mil-D-3464E defines a “Unit” as the amount of desiccant needed to adsorb:
3 grams of water at 20% RH, 25, and
6 grams of water at 40% RH, 25.
A unit is also roughly equivalent to one ounce.
The feature of all kinds of desiccants and their application
Desiccant also called desiccant packets, moisture absorber, and moisture adsorbent. The most common desiccants are silica gel desiccant, clay desiccant, calcium chloride desiccant, molecular sieve desiccant and others.
hat hut am silica
Silica gel desiccant is the most traditional and widely used desiccant.
ııFeatures of silica gel hat chong am
1. Non-toxic, tasteless, chemical stability, good thermal stability,
2. Strong adsorption capacity under various conditions.
3. Wide range of applications.
Indicating silica desiccant
Indicates silica gel include blue silica gel and orange silica gel. Indicating silica gel has the same performance with transparent silicone. the color changing after absorbed can indicating absorbent state.
MONTMORILLONITE hat hut am clay
Montmorillonite desiccant also known as bentonite desiccant.the raw material of montmorillonite clay is irregular with purple yellow, gray colors.
It is non-toxic, natural and has strong adsorption ability. In usual, 1 unit desiccant equivalent to 33 gram montmorillonite clay .
Features:
1. Fully degradable in nature, environmental, non-toxic and harmless
2. in a low humidity circumstance , the moisture absorption performance is higher than silica gel desiccant
3. It has a neutral PH value, very suitable for high-end electronic products
ACTIVE CLAY DESICCANT
Active clay desiccant was made of attapulgite. When at a high temperature, the moisture absorption capacity is higher than montmorillonite clay.
It is also degradable .Active clay desiccant meets the US military standard MIL-D-3464E, China military standard GJB2714-2005.
Features:
1. Natural mineral products, harmless, environmental.
2. Flexible regulation of its moisture absorption rate.
3. Excellent water locking.
4. Widely used in camera lighting products, wood and rattan products, handicrafts etc.
MOLECULAR SIEVE DESICCANT
Molecular sieve is a crystalline aluminum silicate compound, which has a regular structure and uniform proes.
It only allow the apertures that the diameter smaller than molecules entering. therefore called molecular sieves.
ııFeatures:
1. In the ultra-low-humidity conditions, it still able to absorb a large amount of water vapor in the environment, effectively control the humidity.
2. it will absorb a large amount of water vapor within a very short time .
Post je objavljen 31.10.2019. u 11:24 sati.