Excerpt from Permeability of Rubber to Gases Paper No. I published the results of an investigation of methods for the determination of the permeability of rubber to hydrogen. The present investigation of the factors involved in the passage of gas through rubber and the permeability of rubber to different gases has been correlated with that work. The. Experimental work extended from 1917 to 1919; its publication has been de layed for obvious reasons. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work.This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

This extensively revised and updated second edition of the only data handbook available on the properties of commercial polymeric films details the permeability characteristics of over 125 major plastic and elastomer packaging materials. New to this edition are 92 resin chapters containing textual summary information including: category, general description, processing methods, applications, and general permeability considerations for water vapor, oxygen, and other gases including aroma and flavor. The product data is presented in graphical and tabular format, retaining the familiar format of the first edition and allowing easy comparison between materials and test conditions.

Permeation experiments were conducted to study the structural differ- ences between synthetic poly-cis 1,4-isoprene (SNR) and natural rubber (NR), as well as differences resulting from filling with carbon black. The study aimed further at testing Frisch's theory of isotope effects in activated diffusion and on the unit size of the free volume in rubbers. The rubber samples consisted of thin crosslinked sheets of NR AND SNR. The carbon content in the filled samples was 16% by volume. The permeation rate of hydrogen and deuterium through filled and un-filled NR and SNR were measured by the time-lag method as a function of temperature and pressure (40-85 C and 1-55 cm of Hg). The permeability coefficient, p, diffusion coefficient, d, and solubility, s, thus deduced were further used to evaluate the energies of activation for permeation and for diffusion, and the heat of solution according to the Arrhenius equation. The results show that hydrogen has generally a higher permeability and diffusivity than deuterium and that the permeabilities or diffusivities are markedly reduced by the presence of the filler.

In 1901 the National Bureau of Standards (NBS) was founded to provide standard weights and measures and to be the national physical laboratory for the United States of America. The NBS conducted a lot of research in the fields of science and technology which were reported as "Scientific Papers." In 1988 the NBS became what we know now; the National Institute of Standards and Technology (NIST). This is one of those documents written by employees of the NBS.