- 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