Bulk Molecular Sieve


Molecular sieve is a synthetically crystalline metal alumosilicate zeolite. Molecular sieve particles have a uniform pore structure (created during the manufacturing process). This enables molecular sieve to separate molecules by size. It is also non-hazardous and derived from naturally occurring materials.


Molecular sieve is the desiccant of choice for the most demanding and unique applications. The pore structure of molecular sieve provides a higher capacity for water absorption than either silica gel or clay at very low humidity levels.


Molecular sieve also retains a higher percentage of moisture capacity at elevated temperatures. In fact, molecular sieve can hold moisture at temperatures well past 450°F (232°C). Due to its high affinity for moisture, molecular sieve is able to bring the relative humidity in packages down in the low ppm range.


The most commonly used pore size for drying applications is 4 angstroms (4A). Molecular sieve desiccant is also available 3 angstroms (3A), 5 angstroms (5A) and 10 angstroms (13X) sizes for specific molecule separation, including gases.


Molecular sieve is the most aggressive of the primary desiccants in terms of absorption rate, so additional handling procedures may need to be considered.


To determine the best size for your application, please refer to our Mesh Size Equivalents Chart.


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