The pore size of 3A molecular sieve is 3A, which is mainly used for adsorbing water. It does not adsorb any molecules with a diameter larger than 3A. According to the characteristics of industrial applications, the molecular sieves we produce have faster adsorption speed, more regeneration times, higher crushing strength and anti-pollution ability, which improves the utilization efficiency of molecular sieves and prolongs the service life of molecular sieves. It is a desiccant for deep drying, refining and polymerization of gas and liquid phases in the petroleum and chemical industries.