‌13X-APG molecular sieve is a sodium X-type aluminosilicate crystal with a pore size of 10A, which can adsorb molecules with a critical diameter less than 10A. Its main component is aluminosilicate, and its chemical formula is Na86[(AlO2)86(SiO2)106]·XH2O. 13X-APG molecular sieve has a high carbon dioxide adsorption capacity, and can also adsorb trace moisture, acetylene and other hydrocarbons in the air.

‌13X molecular sieve‌, also known as sodium X-type molecular sieve, is an alkali metal aluminosilicate with a certain alkalinity and belongs to the solid base class. Its chemical formula is Na2O·Al2O3·2.45SiO2·6.0H2O, with a pore size of 10A, and it can adsorb any molecule with a diameter less than 10A‌.

‌5A molecular sieve‌ is a chemical substance with a molecular formula of 3/4CaO·1/4Na2O·Al2O3·2SiO2·9/2H2O and an effective pore size of about 5Å (1Å=0.1 nanometer), or about 0.48~0.57nm‌. 5A molecular sieve belongs to alkali metal aluminosilicate with A-type crystal structure, with a specific pore size and adsorption capacity, and can adsorb any molecule with a diameter smaller than its pore size‌.

‌4A molecular sieve‌ is a molecular sieve with a pore size of 4A, and its main component is alkali metal aluminosilicate. It can adsorb molecules with a diameter less than 4A, such as water, methanol, ethanol, hydrogen sulfide, sulfur dioxide, carbon dioxide, ethylene and propylene, but not molecules with a diameter greater than 4A, such as propane‌.

‌3A molecular sieve‌ is an alkali metal aluminosilicate, also known as 3A zeolite molecular sieve. Its chemical formula is K2O·Na2O·Al2O3·SiO2·H2O, with a pore size of about 3 angstroms (1 angstrom = 0.1 nanometers). It is mainly used to adsorb water and does not adsorb any molecules with a diameter greater than 3 angstroms.