REVERSIBLE HYDROCOLLOID = AGAR 2M*

reversible ( gel can change to paste by heating, then can change back to gel by cooling)
a major component is seaweed – comes as collapsible tubes
you boil it at 100° C for 10 mins then store at 65°C for 10 mins then temper at 43-46° C 5-10 mins before you take the impression
agar can be stored at 65°C for 5 days before it has to be reboiled again

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