The moisture content of the films equilibrated at two different
relative humidities is shown in Table 2. Regardless of formulations,
all films displayed greater moisture content at 75% RH than at 50%
RH. Films based just on WPI had the lowest moisture content (9.2%
at 50% RH and 15.3% at 75% RH). For films composed of WPI–MG, it
was observed a small but significant increase in moisture content
as the ratio WPI/MG decreased, for both RH.