Sheet materials. Determination of water vapour transmission rate (WVTR). Gravimetric (dish) method Ingestion-build-73073 It can also be applied

It can also be applied to medical devices that are intended to be used topically in clinical indications where the surface or lining might have been breached in order to evaluate local tissue responses

BS 5642‑2

equivalent to that of the defined reference condition

Marking by colour code

Sheet materials. Determination of water vapour transmission rate (WVTR). Gravimetric (dish) method Ingestion-build-73073 It can also be applied1 Scope This document specifies a method for the determination of the water vapour transmission rate (often erroneously called permeability) of sheet materials. This method is not generally recommended for use if the transmission rate is expected to be less than 1 g m2 per day or for materials thicker than 3 mm. In such cases the method specified in ISO 9932 is preferred. The method cannot be applied to film materials that are damaged by hot wax or