An impression taking vulcanisable material e.g. for dental use comprises: (a) approximately 30-70 (30-40) wt. % aziridino-polyether； (b) approximately 5-20 wt. % triacylglyceride of non-animal origin having a stearoyl content of &ge； 70 wt. % on the acyl content of the triacylglyceride or a lower stearoyl content provided it does not have a deleterious influence on the storage stability of the impression material before it has been esterified into the composition； and (c) approximately 10-65 (40-65) wt. % catalysts, assistants and additives.
