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Petrotat 3A Molecular Sieve is a synthetic crystalline aluminosilicate with a regular micropore structure. it is the potassium form of the type A crystal structure. Type 3A has an effective pore opening of about 3 angstroms (0.3nm). This is large enough to allow in moisture, but excludes molecules such as unsaturated hydrocarbons which can potentially form polymers; and this maximizes lifetime when dehydrating such molecules.
Petrotat 3A Molecular Sieve family included 3A MS03 commonly used for drying of gases like CNG and 3A-EDG for polar solvents (methanol, ethanol) and PURSORB® 3A-EPG, 3A-EPG II and 3A-PPG for polymerizable substances, such as unsaturated hydrocarbons (ethylene, propylene, acetylene and butadiene).