The decomposition of organic templates in molecular sieves SAPO-5, SAPO-11, SAPO-20, SAPO-34 and SAPO-37 was investigated by TG, DTG and DTA. In the case of SAPO-S, the decompositions of various organic templates were studied. The effects of the type of crystal structure, the pore size and the channel system on the complete removal of the organic material were considered.