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 another type of sealed enclosure; the combination of a sealed container with a desiccant or oxygen absorber is sometimes referred to as active packaging or a sorbent system. 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 gel, blue indicating silica gel, and orange indicating silica gel; montmorillonite 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: flprocessing@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 accommodate the higher amount of water vapor that will be transmitted through the film over the course of the package's lifetime. 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 headroom (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 in an oven when in their bulk form - do not attempt to dry/bake desiccant pouches! We also carry a 5lb (80 unit) clay desiccant bag that can be placed in an oven.

About Desiccant Units

See Why Molecular Sieve Is Best Desiccant


Water Capacity of Various Sorbents at Different Relative Humidity Levels

chart showing effectiveness of various desiccants in increasing relative humidity

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?”

chart showing capacity of various desiccants over time chart showing capacity of various desiccants over increasing temperatures
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Two .5g indicating silica gel desiccant packets
About: 0.5 gram Indicating Silica Gel Desiccant Packet; 2 tins containing 2,000 packets packaged ..
$90.20
0.25 Gram Molecular Sieve Desiccant Packet
0.25 Gram Molecular Sieve Desiccant Packet Dimensions: 0.625" x 0.75" ea 3,000 pieces packaged..
$90.20
0.25 Gram Molecular Sieve Desiccant Packet
0.25 Gram Molecular Sieve Desiccant Packet Dimensions: 0.625" x 0.75" ea 2 tins containing 15,..
$479.98
H compression molded desiccant
0.5" H x 2.9" D Compression Molded Desiccant 3A molecular sieve with binder Weight:  ..
$12.69
Out of Stock
single white packet in Tyvek with 33g of clay moisture absorbing material
1 Unit clay desiccant packets packaged in Tyvek; (50 pieces/case) Dimension: 3.0" x 3.5" ea ..
$15.35
1/3 unit clay desiccant packet
1/3 unit clay desiccant packet;  Dimensions: 2.25" x 3.125" ea Packaged in Tyvek 1056D ..
$19.62
1/3 Unit clay desiccant packet
1/3 Unit clay desiccant packet Dimensions: 2.25" x 3.125" ea 12 PE bags in 1 container Pack..
$117.50
single white pouch with clay desiccant moisture absorber inside
1/6 unit (5.5 Grams) clay desiccant packet; Dimensions: 2.25" x 2.55" ea 100 pieces per pack ..
$16.85
1/6 unit clay desiccant packet
1/6 unit (5.5 Grams) clay desiccant packet; Dimensions: 2.25" x 2.55" ea (3,000/case) ..
$247.04
3 Spot Humidity Indicator Card
10%, 20%, 30% 3 Spot Humidity Indicator Card (100/pack) 0.67" x 2.0" ..
$18.98
3 Spot Humidity Indicator Card
10%, 20%, 30% 3 Spot Humidity Indicator Cards (500/case) 0.67" x 2.0" ..
$86.47
3 Spot Humidity Indicator Card
10%, 20%, 30% 3 Spot Humidity Indicator Card (10/pack) 0.67" x 2.0" ..
$6.93
6 Spot Humidity Indicator Card
10%-60% RH 6 Spot Humidity Indicator Card; (10/pack) 1.5" x 4.0" ..
$8.10
6 Spot Humidity Indicator Cards
10%-60% RH 6 Spot Humidity Indicator Card; (100/case) 1.5" x 4.0" ..
$48.30
16 unit clay desiccant packet
16 unit clay desiccant bags packaged in MylarFoil barrier bag (10/pack) Dimensions: 5.5" x 7.875"..
$30.49
single white desiccant packet with 66g of clay moisture absorbing material
2 unit clay desiccant packet packaged in Tyvek;  Dimensions: 3.0" x 5.125" ea 66 grams EA..
$108.97
6 Spot Humidity Indicator Card
30%-80% RH 6 Spot Humidity Indicator Card; (10/pack) 1.5" x 4.0" ..
$8.10
6 Spot Humidity Indicator Card
30%-80% RH 6 Spot Humidity Indicator Card (100/case) 1.5" x 4.0" ..
$48.30
4 clay desiccant packets next to red and blue jellybean for scale
4 Unit Clay Desiccant Packet; 2 tins containing 100/each; 200/case Dimensions: 3.75" x 5.5" x 0.5..
$186.48
5 lb Clay Desiccant
80 unit clay desiccant bag     - 80 units equal approximately 5 lbs of clay desiccant m..
$10.82
clay desiccant bags
400 units clay desiccant bags (5 Packs of 5 lbs)      - 80 units equal a..
$45.42
Various size desiccant packets
5 gram Activated Carbon Odor Absorber desiccant packets.  Comes in 2 tins containing 1,000 p..
$280.90
large molecular sieve pouches on black table
500 Gram Molecular Sieve Desiccant Bag Desiccant Bag Dimensions: 6" x 9" Case Weight: 50lbs ..
$211.11
8 unit clay desiccant packet
8 unit clay desiccant packet in Tyvek; (100 pieces) Dimensions: 4.125" x8.0" ea 264 gram 2 ..
$122.93
Single Spot Humidity Indicator Card
8% RH Single Spot Humidity Indicator Card (10/pack) Card:  3.25" x 3.25" ..
$9.28
Single Spot Humidity Indicator Card
8% RH Single Spot Humidity Indicator Card (100/pack) Card:  3.25" x 3.25" ..
$58.75
Single Spot Humidity Indicator Card
8% RH Single Spot Humidity Indicator Card (500/can) Card:  3.25" x 3.25" ..
$147.67
8% RH single spot humidity indicator card
8% RH Single Spot Humidity Indicator Card; (100/pack) Card:  1.5" x 2" ..
$18.55
8% RH Single Spot humidity indicator card
8% RH Single Spot Humidity Indicator Card; (500/pack) Card:  1.5" x 2" ..
$61.63
LiquaSafe Liquid Absorber packets
0.5 gram LiquaSafe™ liquid absorber 100 pieces/pack with foil bag Applications: Aque..
$15.80
front and back of white humidity regulation pack 62%
Size 4 62%RH 2-way Humidity Regulator Details: 4-gram weight Maintains 62% Relative Humidi..
$3.73
medium white humidity regulating sachet
Size 60 62%RH 2-way Humidity Regulator Details: 60-gram weight Maintains 62% Relative ..
$3.73
front and back of white humidity regulating packet
Size 8 62%RH 2-way Humidity Regulator Details: 8-gram weight Maintains 62% Relative Humidit..
$5.65
piles of .5g indicating silica gel packets
0.5 gram Indicating Silica Gel Desiccant Packet Dimensions: 0.625" x 1.0" ea 2 tins containing..
$407.93
0.5 Gram Molecular Sieve Desiccant Packet
0.5 Gram Molecular Sieve Desiccant Packet Dimensions: 0.67" x 1" ea 2,000 pieces packaged in a..
$90.20
0.5 Gram Molecular Sieve Desiccant Packet
0.5 Gram Molecular Sieve Desiccant Packet Dimensions: 0.67" x 1" ea 2 tins containing 10,000/e..
$407.26
white desiccant beads on black table
5lb can of white non-indicating silica gel 2-4mm bead diameter 4x8 mesh 1 Can Need a dif..
$23.00
pile of Liquasafe absorber packets
1.5 Gram LiquaSafeTM Liquid Absorber 100 pieces/pack with foil bag Applications: Aqu..
$25.16
1.0" H x 1.7" D Compression Molded Desiccant (1/pack) - CM900G50D2
1.0" H x 1.7" D Compression Molded Desiccant 3A molecular sieve with binder Weight:  ..
$27.19
piles of 2g non indicating silica gel packets
2.0 gram non-indicating silica gel desiccant packets; Dimensions: 0.75" x 2.0" ea 2 tins cont..
$274.44
1.0 Gram Indicating Silica Gel Desiccant Packet
1.0 gram Indicating Silica Gel Desiccant Packet Dimensions: 0.75" x 1.375" ea 1,000 pieces pac..
$90.20
2.0 Gram Molecular Sieve Desiccant Packet
2.0 Gram Molecular Sieve Desiccant Packet; 600 pieces Dimensions: 0.75" x 1.89" ea 600 pieces ..
$90.20
2.0 Gram Molecular Sieve Desiccant Packet
2.0 Gram Molecular Sieve Desiccant Packet; 600 pieces Dimensions: 0.75" x 1.89" ea 2 tins cont..
$317.66
piles of 7g non indicating silica gel packets
7.0 gram non-indicating silica gel desiccant packet; Dimensions: 1.0" x 3.125" ea 2 tins conta..
$237.98
3.5 Gram 13X Molecular Sieve Desiccant Packet
3.5 Gram 13X Molecular Sieve Desiccant Packet 100 pieces packaged in V4R08513 vacuum bag with thr..
$16.48
3.5 Gram 13X Molecular Sieve Desiccant Packet
3.5 Gram 13X Molecular Sieve Desiccant Packet; 400 pieces Dimensions: 1" x 2.17" ea 2 tins con..
$326.56
3.5 Gram 13X Molecular Sieve Desiccant Packet
3.5 Gram 13X Molecular Sieve Desiccant Packet Dimensions: 1" x 2.17" ea 500 pieces packaged in..
$63.44
5.0 Gram Molecular Sieve Desiccant Packet
5.0 Gram Molecular Sieve Desiccant Packet Dimensions: 1" x 2.75" 2 tins containing 1,500 ..
$286.24
5.0 Gram Molecular Sieve Desiccant Packet
5.0 Gram Molecular Sieve Desiccant Packet Dimensions: 1" x 2.75" 300 pieces packaged in a Myla..
$90.20
7 Gram 13X Molecular Sieve Desiccant Packet
7 Gram 13X Molecular Sieve Desiccant Packet (2,000/case) The 13X molecular sieve, with its 10&..
$408.62