Molecular sieve 4A ndi chida chosunthika chomwe chimagwira ntchito yofunikira pamachitidwe osiyanasiyana amakampani. Ndi mtundu wa zeolite, mchere wa crystalline aluminosilicate wokhala ndi porous womwe umalola kuti adsorb mosankha mamolekyu kutengera kukula ndi mawonekedwe awo. Dzina la "4A" ndi ...