Thermal conductivity of natural zeolite-PTFE composites

Zeolite tuff-PTFE composites as adsorbing solids are investigated. Three zeolite tuffs, respectively rich in phillipsite, chabazite and clinoptilolite, were used as starting materials in preparing these composites. Their main features are discussed and compared with those of usual commercial adsorbents, emphasizing some of the advantages arising from their use. Parameters of significant importance in these materials such as water vapour adsorption capacity, thermal conductivity and bulk density are measured and related to each other. Useful indications in the choice of the most proper zeolite tuffs to be used as starting materials are collected.