OTHER ANIMAL STUDIES
These materials have been designed to be rapidly cleared from tissue. And this low biopersistence has been
confirmed in many studies using EU protocol ECB/TM/27(rev 7) and the German method specified in TRGS
905 (1999). When inhaled, even at very high doses, they do not accumulate to any level capable of
producing a serious adverse biological effect. In lifetime chronic studies there was no exposure-related effect
more than would be seen with any “inert” dust. Subchronic studies at the highest doses achievable produced
at worst a transient mild inflammatory response. Fibres with the same ability to persist in tissue do not
produce tumours when injected into the peritoneal cavity of rats.