IRREVERSIBLE HYDROCOLLOID -ALGINATE ,INTRODUCTION TYPES ,SUPPLIED AS ,APPLICATIONS ,COMPOSITION ,SETTING REACTION ,GEL STRUCTURE ,PROPERTIES OF ALGINATE HYDROCOLLOID ,ELASTICITY AND ELASTIC RECOVERY ,SHELF LIFE AND STORAGE ,MANIPULATION ,MIXING TIME ,WORKING TIME ,GELATION TIME ,TRAY SELECTION ,LOADING THE TRAY ,SEATING THE TRAY ,TIME OF REMOVAL AND TEST FOR SET ,REMOVAL OF IMPRESSION ,STORAGE OF ALGINATE IMPRESSION ,ADVANTAGE ,DISADVANTAGE