CAN CGSB-4 2 NO 49-1999 Textile Test Methods Resistance of Materials to Water Vapour Diffusion.pdf

1、 CAN/CGSB-4.2 No. 49-99 Supersedes CAN/CGSB-4.2 No. 49-M91 Reaffirmed November 2013 National Standard of Canada ICS 59.080.01 Textile test methods Resistance of materials to water vapour diffusion The CANADIAN GENERAL STANDARDS BOARD (CGSB), under whose auspices this standard has been developed, is

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9、 the responsibility of the users of the standard to judge its suitability for their particular purpose. The testing and evaluation of a product against this standard may require the use of materials and/or equipment that could be hazardous. This document does not purport to address all the safety as

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11、ility for any injury or damage that may occur during or as the result of tests, wherever performed. Attention is drawn to the possibility that some of the elements of this Canadian standard may be the subject of patent rights. CGSB shall not be held responsible for identifying any or all such patent

12、 rights. Users of this standard are expressly advised that determination of the validity of any such patent rights is entirely their own responsibility. Further information on CGSB and its services and standards may be obtained from: The Manager Standards Division Canadian General Standards Board Ga

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20、ed to make a significant and timely contribution to the Canadian interest. Those who have a need to apply standards are encouraged to use NSCs. These standards are subject to periodic review. Users of NSCs are cautioned to obtain the latest edition from the SDO that publishes the standard. The respo

21、nsibility for approving standards as NSCs rests with: Standards Council of Canada 270 Albert Street, Suite 200 Ottawa, Ontario K1P 6N7, CANADA How to order Publications: by telephone 819-956-0425 or 1-800-665-2472 by fax 819-956-5740 by mail CGSB Sales Centre Gatineau, Canada K1A 1G6 in person Place

22、 du Portage Phase III, 6B1 11 Laurier Street Gatineau, Quebec by email ncr.cgsb-ongctpsgc-pwgsc.gc.ca on the Web www.tpsgc-pwgsc.gc.ca/ongc-cgsb NATIONAL STANDARD OF CANADA CAN/CGSB-4.2 No. 49-99 Supersedes CAN/CGSB-4.2 No. 49-M91 Reaffirmed November 2013 Textile test methods Resistance of materials

23、 to water vapour diffusion CETTE NORME NATIONALE DU CANADA EST DISPONIBLE EN VERSIONS FRANAISE ET ANGLAISE. Published March 1999 by the Canadian General Standards Board Gatineau, Canada K1A 1G6 Minister of Public Works and Government Services Canada 1999 No part of this publication may be reproduced

24、 in any form without the prior permission of the publisher. Prepared by the Canadian General Standards Board Approved by the CAN/CGSB-4.2 No. 49-99 CGSB 2013 All rights reserved CANADIAN GENERAL STANDARDS BOARD Committee on Textile Test Methods and Terminology (Voting membership at date of reaffirma

25、tion) General interest category Batcheller, J. University of Alberta Carrick, D. Consultant Davie, N. Consultant Liu, S. University of Manitoba Man, T.M. Consultant Tait, C. National Defence/DSSPM Producer category Adam, C. Tencate Protective Fabrics Canada Boivin, D. E.I. DuPont Co. Lawson, L. Dave

26、y Textile Solutions Leblanc, J.-M. Marv Holland Apparel Ltd. Schumann, E. Lincoln Fabrics Ltd. Taylor, V. Invista (Canada) Co. Regulator category Andersson, C. Health Canada User category Bourget, S. National Defence/QETE DEntremont, E. Royal Canadian Mounted Police Izquierdo, V. Textile Technologie

27、s Centre Kohli, G. Sears Canada Inc. Larsen, A.-L. Exova Group Ltd. Litva, M. Canada Border Services Agency MacLeod, J. Public Works and Government Services Canada Tebbs, C. International Drycleaners Congress Secretary (non-voting) Grabowski, M. Canadian General Standards Board Acknowledgment is mad

28、e for the translation of this National Standard of Canada by the Translation Bureau of Public Works and Government Services Canada. CGSB 2013 All rights reserved i CAN/CGSB-4.2 No. 49-99 Supersedes CAN/CGSB-4.2 No. 49-M91 Reaffirmed November 2013 Preface to the National Standard of Canada This Natio

29、nal Standard of Canada has been reaffirmed by the CGSB Committee on Textile Test Methods and Terminology. Editorial changes have been made by the correction of the following paragraphs: 15.1 The publications referred to in par. 3.1.1 may be obtained from the Canadian General Standards Board, Sales C

30、entre, Gatineau, Canada K1A 1G6. Telephone 819-956-0425 or 1-800-665-2472. Fax 819-956-5740. E-mail ncr.cgsb-ongctpsgc-pwgsc.gc.ca. Web site www.tpsgc-pwgsc.gc.ca/ongc-cgsb. 15.2 The publication referred to in par. 3.1.2 may be obtained from ASTM International, 100 Barr Harbor Drive, West Conshohock

31、en, PA 19428-2959, U.S.A., telephone 610-832-9585, fax 610-832-9555, Web site www.astm.org, or from IHS Global Canada Ltd., 200-1331 MacLeod Trail SE, Calgary, Alberta T2G 0K3, telephone 613-237-4250 or 1-800-267-8220, fax 613-237-4251, Web site . Reaffirmed1RYember 2013OPTION 1 - Test Specimen Plac

32、ed Approximately Equidistant Between the Base (Dry Airtlnw) and the Cylinder (Water Cell) APPARATUS The test measuring cell is shown in detail in Figure 1 which also indicates the approximate dimensions. Essentially, the cell consists of two components, an upper plexiglass cylinder which slides into

33、 a plexiglass base plate. The bottom of the plexiglass cylinder is made of a sheet of microporous PTFE film2 supported by a metal screen (0.61 mm wire with 6.35 mm spacing), held in place by a 3 mm aluminum spacer ring fastened to the base of the cylinder. To prevent leakage of water vapour between

34、the cylinder and spacer ring, a rubber 0“ ring is placed in position prior to fastening the spacer ring to the cylinder hase. To ensure a uniform water temperature across the cell, a circular copper disc 0.56 mm thick and a diameter 2 mm less than that of the cylinder is fixed in position about 1 mm

35、 above the PTFE hase of the cylinder. The plexiglass hase plate also has a layer of PTFE in its top covered by a 16 mesh (16 wires per 10 cm) screen made from No. 23 B and S gauge wire, on which the specimen under test is placed. Beneath this PTFE layer, airflow is forced around a baffle system to c

36、ause turbulence, preventing dead air spaces.) A balance, capable of determining the mass of the cylinder filled with water and having a readability of at least 0.01 g.4 A supply of dry air capable of delivery at a rate of 4 + 0.5 Lhin to the hase of the water vapour diffusion cell. Air may be suppli

37、ed by a compressed air line, a cylinder or an air pump. However, to ensure that air is dry before entering the hase of the apparatus, it should he passed through two gas drying tubes containing an 8 mesh indicating deiccant. The actual flow should be controlled by a suitable flowmeter. Equipment to

38、measure the water temperature to an accuracy of M.lC. The room or cabinet where the test is to he performed shall have a controlled humidity and temperature (conditions as in CANICGSB-4.2 No. 2) to minimize water temperature variations during the actual test. TEST SPECIMENS6 At least four circular t

39、est specimens, with a diameter sufficient to cover the opening of the base, shall be cut from each sample in such a way that no two specimens contain the same warp or weft yarns, and shall not he taken from creased or damaged areas of the sample. Condition the specimens in accordance with CANICGSB-4

40、2 No. 2. Unless otherwise requested, perform the test so that the side of the test specimen intended to face the water vapour source is facing the water cylinder, and report the orientation used. PROCEDURE Assemble the water diffusion cell and connect air lines as shown in Figure 2A or 2B. Pour dis

41、tilled water into the cylinder and allow to come to room temperature. The commercial product Gore-Tex with 0.45 pm average pore size, which has been found satisfactory, may be obtainedfrom S.E.A. Engineering Company, Inc., 25 Fairbanks St., Darfmouth, Nova Scoria B3A 4.79. Telephone (902) 469.1230.

42、A membrane with 0.2 pm pore size has also been found satisfactory, and may be obtained from from Labcor Technical Sales, 1-800-363-5900, Catalogue No. E-02916.58, Membranes - Teflon. 3Equipment that generates comparable results is available from S.E.A. Engineering Company, Inc., 25 Fairbanks St., Da

43、rtmouth, Nova Scoria B3A 4.79. Telephone (902) 469-1230, A balance with a capacify of af least 1000 g is required. A direct reading top loading balance is found to be particularly advantageous. S“Drierite“ has been found satisfactory. 41fthe precision of rhe results is specified, refer to CANKGSB-4.

44、2 No. I to determine the number of test specimens required; otherwise, at least four specimens shall be rested. No. 49-99 Position the specimen within the water vapour diffusion cell in the following order from bottom to top: base, specimen, cylinder. To determine the resistance of the apparatus, pe

45、rform steps in par. 6.5 with no specimen in place. To ensure stability of the cell, it is recommended that these blank runs be performed before and after each sample test (set of four specimen determinations) and the blank runs averaged. Turn on the airflow, adjusting it to 4 f 0.5 Ltmin. Allow to s

46、tabilize for approximately 45 min. Remove and weigh the cylinder as quickly as possible to minimize exposure of the sample to ambient conditions, recording mass, water temperature and time to the nearest 15 s. Replace the cylinder and run for approximately 30 min. Reweigh and repeat the above two mo

47、re times for a total of four readings. After the last three readings (with specimen in place), the average mass of water vapour transmitted is calculated. If the last three readings fall within fi% of the average then the test is terminated. If not, then the test continues at 30 min intervals and th

48、e average is calculated at each additional interval (last three readings) until the readings fall within 25% or until a 3% h period (from start of the test) is reached, whichever occurs first. All 5 masses of water loss shall be used in the calculation if the 3% h period is reached. Repeat the above

49、 determinations for each specimen. OPTION 2 - Test Specimen Placed Closer to the Cylinder (Water Cell) than to the Base (Dry Airtlow) APPARATUS The test measuring cell is shown in detail in Figure 1 which also indicates the approximate dimensions. Essentially, the cell consists of two components, an upper plexiglass cylinder which slides into a plexiglass base plate. The bottom of the plexiglass cylinder is made of a sheet of microporous PTFE film8 supported by a metal screen (0.61 mm wire with 6.35 mm spacing), held in place by a