dessicant

èetvrtak, 31.10.2019.

Everything about Desiccant

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.

ýýFeatures 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.

ýýFeatures:

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 .
- 11:24 - Komentari (0) - Isprintaj - #

Why the clothes got mildewed?

ýHave you ever be troubled that your white clean shirt got some black mildew spots or bad odors? In rainy season, it is even worse. Why the clothes got mildewed? The main reasons are the following below:

ýý1. Mould is the main cause of mildew in garments, while the wet environment (high temperature and humidity) is the fundamental cause.

ýý2. The main raw materials of garment are cotton, linen, leather, silk, wool, and chemical fiber etc. They contain high moisture content, and easy to absorb water.

ýýFor example, the leather generally contains more than 14% moisture content, some even 18%. When the moisture content above 12%, there is a mildew risk.

ýý3. The oil stain, sweat, dust on the clothes are also easy to lead to bacterial and mould.

ýý4. Improper storage probably causes your clothes damage.

ýýIf your clothes are not completely dried but storage quickly, then, it is particularly easy to get mildewed. The basic requirements for storage are ventilation, cool, dry, and avoid sunlight exposure. The methods vary according to different clothes. When season change coming , before collect up the off-season clothes, you'd better wipe the collar, cuffs, lapel clean by water or little alcohol solution. It must be fully dry before stacked up and storage.If leather clothes got mildewed, use a towel dipped with soapy water to wipe clean the spot, after be fully dried, coat some jacket oil.

ýý5. It is necessary to check your cabinets, clothing storage container etc. In good weather and leisure days, open the closet door, clean the mildew, and especially check the corners. Keep the wardrobe dry and ventilated .It is very easy to get mildewed in VietNam rainy days .It is necessary to take precautions, like put some desiccant, moisture absorber box into the closet, wardrobe, cabinet in advance. Put some newspaper on the bottom cupboard.

ýý6. For large numbers of clothing manufactures exporters, neglecting moisture prevention will very likely to get loss.

ýýFinished clothes are put into the carton box, and then transported across ocean by sea containers. During the transportation, they encountered the container rain that excess vapors drop onto the cartons or along the container wall, because of huge temperature and humidity change, causing damage and mildew. As we all known, China is a big trading country. According to General Administration of Customs statistics, from January to August, 2016, China's textile and apparel exports amount is nearly 180 billion US dollars. Every year, the damage loss because of moisture is huge. So it is very necessary to take precautions measures. Please use hut am container to hanging at the container wall to absorb the vapors. You need also use small desiccant bags in your carton box so as to protect your garments, cartons from moisture damage. Actually, desiccant bags is very useful in absorb moisture. My suggestion is do not forget them when you are ready to transport across the sea.
- 11:19 - Komentari (0) - Isprintaj - #