Improve Research Reproducibility A Bio-protocol resource
Concise Method
tooltip

2.12. Water Vapor Transmission Rate (WVTR)

PR Pornchai Rachtanapun
WK Warinporn Klunklin
PJ Pensak Jantrawut
NL Noppol Leksawasdi
KJ Kittisak Jantanasakulwong
YP Yuthana Phimolsiripol
PS Phisit Seesuriyachan
TC Thanongsak Chaiyaso
WR Warintorn Ruksiriwanich
SP Suphat Phongthai
SS Sarana Rose Sommano
WP Winita Punyodom
AR Alissara Reungsang
TN Thi Minh Phuong Ngo
ask Ask a question
Favorite

The water vapor transmission rate (WVTR) of the CMCn films was measured using the ASTM method (ASTM, E96-93, 1993). Cups containing ten grams of dried silica gel were covered with the specimens and sealed with paraffin wax. The sealed cups were weighed and kept at 25 °C in a desiccator with a saturated solution of sodium chloride (NaCl) to provide 75% RH. Then, the cups were re-weighed daily for 10 days. The water vapor transmission rate (WVTR) of the films was measured based on the weight gain of the cups and calculated using Equation (10):

where slope is the slope of linear equation of time (y-axis) versus weight gain (x-axis).

The water vapor permeability (WVP) (g m−2 mmHg−1 day−1) was calculated as Equation (11):

where L is the mean film thickness (mm) and ΔP is the partial water vapor pressure difference (mmHg) across the two sides of the film specimen.

Copyright and License information:  ©2021 by the authors.
Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

Do you have any questions about this protocol?

Post your question to gather feedback from the community. We will also invite the authors of this article to respond.

post Post a Question
0 Q&A