What are desiccants?

Desiccants are a type of sorbent that will remove moisture and water vapor from the surrounding environment, in many cases a MylarFoil bag, tin, drum, glass or other type of sealed enclosure. Desiccant media is a very hygroscopic, sometimes natural solid that is chemically inert which will trap water vapor molecules in its tiny pores or tunnels which prevents them from escaping and thereby keeps products dry.

Types of desiccants that IMPAK Corporation carries include:  indicating molecular sieve and non-indicating molecular sieve in a range of pore sizes (3A, 4A, 5A and 10A or 13X).  Plain white silica gelblue indicating silica gel and orange indicating silica gelmontmorillonite clay; activated alumina; activated carbon; calcium oxide and calcium chloride.  The type of desiccant that a technical representative will recommend is going to vary by customer specific applications and requirements.  Please contact a sorbent specialist for more information here: sales15@impakcorporation.com

When evaluating and discussing desiccants, it is important to keep the following in mind:  What type of package are you attempting to desiccate?  If you are using a pouch that has a high water vapor transmission rate (WVTR) you may want to increase the amount of desiccant used to accomodate the higher amount of water vapor that will be transmitted through the film over the course of the package's life time.  What is the volume of the area you are working with?  If you have a large amount of interstitial space (amount of space between the product being packaged) or a lot of head room (amount of space between the top of the product and the top, sealed area of the container, you may want to increase the amount of desiccant to compensate for the increased volume.  How long do you plan on the product being packaged?  When a long shelf life is desired you need to take into consideration the type of container again and calculate the amount of water vapor that will be transmitted through the container wall (if any) and adjust accordingly.  Is this product going to be consumed?  If so, you may want to evaluate a clay or non-indicating silica gel desiccant for products such as these.  Do you want to be able to re-use the desiccant after it is saturated and can no longer adsorb moisture?  If so, you may want to evaluate clay and silica gel. Both desiccants are able to be regenerated when in their bulk form (do not attempt to dry/bake desiccant pouches) in an oven and we also carry a 5lb (80 unit) clay desiccant bag that can be placed in the oven.


Water Capacity of Various Sorbents at Different Relative Humidity Levels

This graph clearly demonstrates the key factors in making a decision on which sorbent is most appropriate for a number of applications. By way of example, this is a graph that clearly shows how both calcium oxide and molecular sieve have some of the highest capacities at low relative humidity levels. 

If your target relative humidity for your product i.e. a lateral flow device, a printed circuit board, a sophisticated piece of electronic equipment, is less than 10%, then this graph clearly shows that with molecular sieve you are getting more than twice the “product” on a gram for gram basis than you are with silica gel. As an industry leader in providing the full range in sorbents, we know how important it is to understand your particular application and how critical it is to answer the question 

”What relative humidity do we want our product not to see?” 

“What level of relative humidity should we ensure that our product never sees?”

 

Refine Search
Sort By:
Show:
016WP100CU: 1/6 unit clay desiccant packets; (100 EA)
1/6 unit clay desiccant packet; 5.5 Gram (100 pieces per bag) ..
$13.50
016WP1500CU: 1/6 unit clay desiccant packets; (3,000/case)
1/6 unit clay desiccant packet; Dimensions: 2.25" x 2.55", 5.5 gram (3,000/tin case) ..
$198.70
10MFS2030U16 - 16 unit clay desiccant bags packaged in MylarFoil barrier bag; (10/pack)
16 unit clay desiccant bags packaged in MylarFoil barrier bag; (10/pack) MylarFoil barrioer bag h..
$24.50
205050PK01: 1 Unit Clay desiccant packet packaged in Tyvek; (50 pieces)
1 Unit clay desiccant packets packaged in Tyvek; (50 pieces per bag) Dimension: 3" x 3.5", ..
$13.50
41MS01 – 0.25 Gram Molecular Sieve Desiccant Packet; (30,000 pieces)
0.25 Gram Molecular Sieve Desiccant Packet Dimensions: 0.625" x 0.75" ea 2 tins containing 15,..
$317.25
41MS31 – 0.25 Gram Molecular Sieve Desiccant Packet; (3,000 pieces)
0.25 Gram Molecular Sieve Desiccant Packet Dimensions: 0.625" x 0.75" ea 3,000 pieces packaged..
$72.50
637BB0310P - 30%. 40%, 50% RH 3 Spot Humidity Indicator Card; (10/pack)
30%. 40%, 50% RH 3 Spot Humidity Indicator Card; (10/pack) Meets Mil Spec 20003-2 ..
$6.50
6HC106010P - 10%-60% RH 6 Spot Humidity Indicator Card; (10/pack)
10%-60% RH 6 Spot Humidity Indicator Card; (10/pack) 1.5" x 4.0" ..
$6.50
6HC308010P - 30%-80% RH 6 Spot Humidity Indicator Card; (10/pack)
30%-80% RH 6 Spot Humidity Indicator Card; (10/pack) 1.5" x 4.0" ..
$6.50
CM290 - 0.5" H x 2.9" H Compression Molded Desiccant
0.5" H x 2.9" H Compression Molded Desiccant 3A molecular sieve with binder Weight:  65 g..
$10.15
CM900G50D2 - 1" H x 2" D Compression Molded Desiccant
1" H x 2" D Compression Molded Desiccant 3A molecular sieve with binder Weight:  50 grams..
$15.50
HIC0108100P - 8% RH Single Spot humidity indicator card; (100/pack)
8% RH Single Spot Humidity Indicator Card; (100/pack) Card:  1.5" x 2" ..
$14.90
HIC031030100P - 10%, 20%, 30% RH 3 Spot Humidity Indicator Card; (100/pack)
10%, 20%, 30% 3 Spot Humidity Indicator Card; (100/pack) 0.67" x 2.0" ..
$15.20
LDT800 01: 5 lb clay desiccant bag (1 pack)
80 unit clay desiccant bag     - 80 units equal approximately 5 lbs of clay desiccant m..
$9.25
LDT800 05: 5 lb clay desiccant bag (5 packs)
400 units clay desiccant bags (5 Packs of 5 lbs)      - 80 units equal a..
$36.50
LSG05FB100 - 0.5 gram LiquaSafe Liquid Absorber; (100/pack)
0.5 gram LiquaSafeTM liquid absorber; 100 pieces/pack with foil bag   ..
$13.50
MT-4U-NW - 4 Unit Clay Desiccant Packet; (180/case)
4 Unit Clay Desiccant Packet; 2 tins containing 90/each; 180/case 4 units = +/-112 grams ..
$143.70
U2CTP: 2 unit clay desiccant packet packaged in Tyvek; (300 pieces per case)
2 unit clay desiccant packet packaged in Tyvek;  66 grams EA 2 tins containing (150) piec..
$96.15
U2MSTPIFB  - 2 unit individually packaged molecular sieve desiccant packet
2 unit individually packaged molecular sieve desiccant packet  Each packet sealed in barrier..
$2.34
U8CT:  8 unit clay desiccant packet packaged in Tyvek; (90 pieces)
8 unit clay desiccant packet; (90 pieces) 264 gram 2 tins containing (45) packets each Conf..
$97.65
UF13CTN960:  1/3 Unit clay desiccant packet packaged in Tyvek; (960 packets)
1/3 Unit clay desiccant packet; 12 PE bags in 1 container Packaged in Tyvek 1056D DIN Certifie..
$103.68
UF13PE80:  1/3 unit clay desiccant packet packaged in Tyvek; (80 pieces)
1/3 unit clay desiccant packet;  Packaged in Tyvek 1056D DIn Certified (80 pieces per ..
$17.28
41MS03 – 0.5 Gram Molecular Sieve Desiccant Packet; (20,000 pieces)
0.5 Gram Molecular Sieve Desiccant Packet Dimensions: 0.67" x 1" ea 2 tins containing 10,000/e..
$315.00
41MS33 – 0.5 Gram Molecular Sieve Desiccant Packet; (2,000 pieces)
0.5 Gram Molecular Sieve Desiccant Packet Dimensions: 0.67" x 1" ea 2,000 pieces packaged in a..
$72.50
639AG05 - 5lb can of white non-indicating silica gel
5lb can of white non-indicating silica gel 2-4mm bead diameter 3x8 mesh ..
$18.50
LSG15FB100  - 1.5 Gram LiquaSafe Liquid Absorber; (100/pack)
1.5 Gram LiquaSafeTM Liquid Absorber; 100 pieces/pack with foil bag   ..
$21.50
CM90004017 - 1.7" W x 4.0" H x 0.9" H Compression Molded Desiccant
1.7" W x 4.0" H x 0.9" H Compression Molded Desiccant 3A molecular sieve with binder Weight: &..
$21.80
40ISG37 – 1.0 gram Indicating Silica Gel Desiccant Packet; (1,000 Pieces)
1.0 gram Indicating Silica Gel Desiccant Packet; 1,000 pieces packaged in a MylarFoil bag w/ Zipp..
$72.50
41MS11 – 2.0 Gram Molecular Sieve Desiccant Packet; (6,000 pieces)
2.0 Gram Molecular Sieve Desiccant Packet; 600 pieces Dimensions: 0.75" x 1.89" ea 2 tins cont..
$218.70
41MS41 – 2.0 Gram Molecular Sieve Desiccant Packet; (600 pieces)
2.0 Gram Molecular Sieve Desiccant Packet; 600 pieces Dimensions: 0.75" x 1.89" ea 600 pieces ..
$72.50