An ideal root-canal filling material should satisfy all of the following except which one?
Grossman's Requirements for an Ideal Root Canal Filling Material 

The material should be easily introduced into the root canal.
It should seal the canal laterally as well as apically.
It should not shrink after being inserted.
It should set slowly.
It should be impervious to moisture.
It should be bactericidal or, at least, should discourage the growth of bacteria.
It should be radiopaque.
It should not stain the tooth structure.
It should not irritate periradicular tissues or affect the tooth structure.
It should be sterile, or easily and quickly sterilized immediately before insertion.
It should be easily removable from the root canal if necessary. 

Ref: Grossman endodontics 13th ed page no 343
The material should be well tolerated by periradicular tissues
The material should be easily placed
The material should be absorbable
The material should be visible radiographically