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Bulk Sorbents


bulk sorbents

In addition to prepackaged desiccants from 0.25 gram packets up to 5 pound bags, IMPAK provides bulk desiccant for industrial and commercial applications.  We have 3 and 5 pound cans of unique silica gel products like FNG and narrow pore, as well as standard 5 pound cans of indicating silica gel and 5 pound cans of non-indicating silica gel.  Both of the previous items are listed below in case quantities for your convenience.

Bulk molecular sieve, indicating molecular sieve and bulk silica gel may be obtained in 55 pound drums and 55 pound bags respectively.  Should you require a mix of indicating silica gel and non-indicating silica gel this item is available as well.  Please ask about custom formulations if that is something you currently require.

Bulk orange silica gel (no cobalt chloride) is now available in 5lb and 55lb containers as well as a new 1lb can of indicating molecular sieve!

Need High Temperature desiccant Capsules?



Click Image for Larger View Part Number Description 1 Can Case of 4

640AG05

5 lb. can of indicating silica gel
2-4mm bead diameter

$25.75/can


$94.50/cs


639AG05

5 lb. can of plain silica gel
2-4mm bead diameter

$18.50/can


$55.50/cs


640SGO05

5 lb. can of orange silica gel
2-4mm bead diameter

$28.50/can


$105.50/cs


63940AG05

5 lb. can of 2% blue silica gel (mix) 98% white
2-4mm bead diameter

$21.80/can


$72.50/cs


639AG05GM28200

5 lb. (2.26kg) can of Silica Gel White Granular 28x200 mesh (0.075-0.60mm)

Absorption Capacity at 25°C
RH = 20% > 11%, 40% > 22%, 60% > 30%, 80% > 32%

$24.40/can


$87.50/cs


639AG05GM1648

5 lb. can of Silica Gel White bead 16x48 mesh (0.3-1mm)

Absorption Capacity at 25°C
RH = 20% > 10%, 50% > 26%, 90% > 36%

$25.30/can


$88.50/cs


639AG05GM0616

5 lb. can of Silica Gel White bead 6x16 mesh (1-3mm)

Absorption Capacity at 25°C
RH = 20% > 10%, 50% > 26%, 90% > 36%

$25.30/can


$88.50/cs


640AG05GM0308

5 lb. can of granular blue indicating silica gel 3x8 mesh (2.36-6.7mm)

Absorption Capacity at 25°C
RH = 20% > 8%, 35% > 13%, 50% > 20%, 90% > 28%

$27.75/can


$96.75/cs


640AG05GM1648

5 lb. can of Blue Indicating Silica Gel Bead 16x48 mesh (0.3-1mm)

$28.90/can


$98.95/cs



  Part Number Description Cost
55 lb Drum Silica Gel 640AG55BG 55 lb Bag of Blue Indicating Silica Gel
2-4mm bead
1 unit:$129.25
2+ units: $118.05

639AG55GM0308 55 lb. (25kg) drum of white silica gel granular 3x8 mesh (2.36-6.70 mm), Absorption Capacity at 25°C: RH = 20% > 11%, 40% > 22%, 60% > 30%, 80% > 32% 1 unit: $105.44
2+ units: $94.24

639AG55BG 55 lb Bag of White Silica Gel
2-4mm bead
1 unit:$88.50
2+ units:$79.30

640SGO55 55 lb bag of non-cobalt chloride orange INDICATING silica gel
2-4mm bead
1 unit:$140.25
2+ units:$124.20



SPECIAL: 640AG55BG - Due to temporary high volume: 2 + bags @ $73.80/ea For locations outside of CA, an additional $22.00 shipping charge will be added (on top of current shipping rate) per item.


»Uses for Different Sized & Pored Silica Gel»


Click Image for Larger View Part Number Description 1 Can Case of 4
13NP639SG05 5 lb can of narrow pore non-indicating silica gel; 1-3mm bead diameter (6x16 mesh) $26.50

$95.35

25NP639SG05 5 lb can of narrow pore non-indicating silica gel; 2-5mm bead diameter (4x8 mesh)
$25.15

$95.60

16WP639SG03 3 lb can of wide pore(cat litter) non-indicating silica gel; 1-6mm bead diameter (3x6 mesh) $23.30

$88.50

38FNG03 3 lb can of large bead 3-8mm non-indicating silica gel; will adsorb 5% @ 20% RH; 15% @ 50% RH and 30% @ 90% RH $37.20

$120.95

400SGF03 5 lb can of silica gel flour; 0.038mm particles (400 mesh) $38.75

$118.70





Looking for a pre-packaged rechargeable cartridge for ANY 3 cubic foot area - DRIBOX

non-cobalt chloride orange                        Dribox rechargeable silica gel cartridge


Montmorillonite Clay

Montmorillonite is a relatively rare segment of the bentonite family with superior adsorption characteristics at low relative humidity. Even at 80% RH, it can pick up (adsorb) as much as 27% of its weight.

Click Image for Larger View
Part Number Description Cost
638MC05 5lb can of
Montmorillonite Clay
$18.85

638MC05CS Case of (4)
5lb cans
of Montmorillonite Clay
$58.50



Molecular Sieve

molecular sieve Molecular sieve, also known as synthetic sodium alumina silicate is a unique adsorbent with a very unique pore structure. This product can be developed so that differentiation in actual pore openings is as small as one angstrom (1 angstrom = 1/1000 of a human hair). It is by far the best choice in terms of desiccant for companies looking to maintain the lowest possible relative humidity.

Molecular sieves retain their ability to adsorb water molecules over a much wider spectrum of temperatures than other desiccant materials. Molecular sieves also have a much higher equilibrium capacity for water vapor under very low humidity conditions. Molecular sieves contain a uniform network of crystalline pores and empty adsorption cavities, which give it an internal adsorptive surface area of 700 to 800 gm2 (1/2 the total volume of the crystals). Because of its uniform structure, molecular sieves will not desorb moisture into the package as readily as silica gel or clay as temperatures rise.

Unlike indicating silica gel, which turns from blue to pink as it becomes saturated with moisture, indicating molecular sieve turns from blue to beige (see picture above).


indicating molecular sieve

Indicating Molecular Sieve Material Safety Data Sheet

Click Image for Larger View Part Number Description Cost 1 lb 5 lb 25 lb 55 lb
641A3MS55-13 3A NON-INDICATING MOLECULAR SIEVE [8X12 MESH] $19.95

$39.60

$95.40

$192.00

641A3MS55-35 3A NON-INDICATING MOLECULAR SIEVE [4X8 MESH] $19.95

$31.00

$95.40

$192.00

641A4MS55-13 4A NON-INDICATING MOLECULAR SIEVE [8X12 MESH] $19.95

$35.20

$79.25

$163.00

641A4MS55-35 4A NON-INDICATING MOLECULAR SIEVE [4X8 MESH] $19.95

$35.20

$79.25

$163.00

641A5MS55-13 5A NON-INDICATING MOLECULAR SIEVE [8X12 MESH] $19.95

$37.25

$89.50

$192.00

641X13MS55-13 13X NON-INDICATING MOLECULAR SIEVE [8X12 MESH] $19.95

$37.25

$89.50

$192.00

641X13MS55-35 13X NON-INDICATING MOLECULAR SIEVE [4X8 MESH] $19.95

$37.25

$89.50

$192.00

641A4MS01 4A can NON-INDICATING molecular sieve 1mm (16x24 mesh)
$21.50

641A4MS05 4A can NON-INDICATING molecular sieve 1mm (16x24 mesh)
$39.50

$95.40

641MS4A55 55 lb of 4A Molecular Sieve (4X8mesh)
$123.75

919AG17/10PK 10 pack 1.5 gram INDICATING molecular sieve capsule $12.50

997AG01 4 oz bag INDICATING molecular sieve 2-4mm (4x8 mesh) $19.75

641IMS05 Can of INDICATING molecular sieve 3-5mm (4x8 mesh) $87.10

$399.40

641IMS05CS Case of 4 5lb. can INDICATING molecular sieve 3-5mm (4x8 mesh)
$348.25

641IMS55 55 lb drum Indicating Molecular Sieve 2-5 mm $735.65




Part Number Description Cost
641MSP05 5 lb can 4A 1/16" molecular sieve pellet, 15% moisture INDICATING bead mixture. $62.45






Uses for Different Sized & Pored Silica Gel

1-3 mm narrow pore silica gel - IMPAK P/N 13NP639SG05:

  • Used for drying items and in moisture proof packaging as a desiccant
  • May also be used as a catalyst carrier in solution
  • It is known to have high adsorbing and dehydration abilities and used to separate gasses depending on the pore size of the gel

1-6 mm wide pore silica gel - IMPAK P/N 16WP639SG03

  • This size is also known as "cat sands"
  • Frequently used as a cat litter alternative, as it is highly effective at reducing odors
  • Has many industrial uses:

    1. Purification and dehydration of gases produced on an industrial level
    2. Adsorption of complex proteins in the industrial fermentation process
    3. Removal of organic acids and high polymers in transformer or insulation oils
    4. Also seen as a basic monomer for complex silica gel products

2-5 mm narrow pore - IMPAK P/N 25NP639SG05

  • Used for drying items and in moisture proof packaging as a desiccant
  • Used as a catalyst carrier for reactions
  • Frequently used as a cat litter alternative, as it is highly effective at reducing odors
  • A precursor to silica powder. Best gel to ground down for powder use

Silica Gel Flour - IMPAK P/N 400SGF03

  • Silica flour has a wide range of uses in the commercial world:
    1. Paints, ceramics, soaps, toothpaste, skin care products, pharmaceuticals
    2. Used in cabels
    3. Often used in building materials and products
  • When added to plasters for molding it increases the range of functioning temperatures from 1300°F to 1450°F
  • Used as filler in epoxy resin castings and adhesives
  • Also possesses abrasion resistant properties



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