8787 International Standard (ISO Paper and board -- Determination of capillary rise Klemm method Papieretcarton--DeterminationdeI'ascensioncapillaire--MethodedeKlemm First edition - 1986-08-15 UDC 676.2 : 620.1 : 539.217 Ref. No. 1SO 8787-1986 (E) O8787-1986 (E) Descriptors : paper, paperboard, absorbent papers, tests, determination, absorption, capillarity, water absorption tests. Price based on 2 pages Noreproductionor networking pemited withoutlicensefrom IHS Not for Resale Foreword ISo (the International Organization for Standardization) is a worldwide federation of national standards bodies (Iso member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member the right to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with Iso, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISo Council. They are approved in accordance with Iso procedures requiring at International Standard ISO 8787 was prepared by Technical Committee ISO/TC 6, Paper, board and pulps. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated. InternationalOrganizationforStandardization,1986 Printed in Switzerland No reproduction or networking permitted without license from IHS Not fr Resale ISO 8787-1986 (E) INTERNATIONAL STANDARD Paper and board - Determination of capillary rise - Klemm method 1 Scope and field of application 5 Apparatus This International Standard specifies the procedure for deter- 5.1 Water pan, of sufficient depth to permit the immersion mining the capillary rise of paper and board by the Klemm of the lower end of the test piece to the required depth. method. It is intended for unsized papers such as blotting papers and other papers having a relatively high water ab- sorbency. 5.2Device which permits the test pieces to be vertically suspended and to be lowered into water to a depth of 10 to The method is not recommended for materials having a 15 mm. capillary rise of less than 5 mm, for which other tests such as in ISO535,Paperandboard- - Determination of water absorp- 5.3Device to determine the capillary rise in relation to a tion -- Cobb method, may be more suitable. datum point at the water surface. This may be a cathetometer or scales attached to the apparatus or separate from it. 2 References NOTE -- The use of a cathetometer will improve the accuracy and simplify reading the length of the capillary rise. ISo 186, Paper and board -- Samplingtodetermineaverage quality. 5.4 Timer with alarm, capable of indicating time up to 11 min to the nearest second. ISo 187, Paper and board - Conditioning of samples. Iso 3696, Water for laboratory use -- Specifications and test 5.5 Clips, such as metal paper clips, each of sufficient methods.1) weight to ensure immersion of the end of the test piece. ISo5725,Precisionoftestmethods Determination of 5.6Pencil, preferably a copy pencil of the indelible type. repeatability and reproducibility by inter-laboratory tests. 6 Sampling and preparation of test pieces Principle Sample in accordance with ISo 186 and condition the samples A strip of the material to be tested is suspended vertically with in accordance with ISo 187. its lower end immersed in water. The capillary rise in 10 min is measured. Cut 10 strips at least 200 mm long and 15 ± 1 mm wide from the sample in the machine direction and/or cross machine The test is carried out in a standard conditioned atmosphere in direction. an open vessel and the measurement of capillary rise is made by means of a cathetometer or by a scale. NOTE -- Where a test piece length of 200 mm cannot be obtained, the greatest length possib