HYDROCOLLOIDS- Reversible Agar-agar & Irreversible Alginate- They both have IMBIBITION (absorbs water) & SYNERGISIS (loss of water);- Similar reaction to water property makes them under hydrocolloids titleAGAR-AGAR- Reversible hydrocolloid- Major composition is water – about 85%- Contains potassium Sulphate – thus helps accelerate the setting of a gypsum cast- Tempering at 46°C- Used in the lab to duplicate master cast- No sterilization protocol needed – advantage- Reproduction of surface details even up to 25 microns, therefore excellent- Impression trays – have water coolant channel- Triple tray technique

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