... drying and refining air, petroleum, gas. Molecular Sieve 5A is an alkali aluminosilicate; it is the calcium form ... of the Type A crystal structure. Type 5A has an effective pore opening of 5 angstroms ... pressure swing processes. To remove moisture from a 5A molecular sieve, a temperature of 250-300°C ... present, and on the conditions of the process. Size 5A - Zeolites are available in beads of 1-2 ...