INTERNATI0NAL STANDARD SO 3998 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEKIYHAPOIHA OPIAHI3ALIHS HIO CTAHIAPTH3ALIHIN.ORGANISATION INTERNATIONALE DE NORMALISATION Textiles -- Determination of resistance to certain insect pests Textiles - Détermination de la resistance a certains insectes nuisibles First edition -- 1977-07-01 Corrected and reprinted O3998-1977 (E) Ref. No. 1SO 3998-1977 (E) UDC 677.017.86 Descriptors : textiles, chemical tests, pest resistance tests, insects. Copyright Internatinal Organization for Standardization Price based on 5 pages itted without license from IHS Not for Resale FOREWORD ISO (the International Organization for Standardization) is a worldwide federation of national standards institutes (isO member bodies). The work of deveioping International Standards is carried out through Iso technical committees. Every member body interested in a subject for which a technical committee has been set up has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with sO, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approvai before their acceptance as international Standards by the ISO Council. Committee ISO/TC 38, Textiles, and was circulated to the member bodies in January 1976. It has been approved by the member bodies of the following countries : Norway Australia Hungary Belgium India Poland Bulgaria Iran South Africa, Rep. of Canada Israel Spain Chile Italy Sweden Korea, Rep. of Turkey Czechoslovakia Finland Mexico United Kingdom France Netherlands U.S.A. Germany U.S.S.R. New Zealand The member body of the following country expressed disapproval of the document on technical grounds : Switzerland @ International Organization for Standardization, 1977 : Printed in Switzerland yitia ganizatinr Standardzation itted without license from IHS Not for Resale ISO 3998-1977 (E) INTERNATIONAL STANDARD Textiles -- Determination of resistance to certain insect pests 3.3 Weighing bottles, with stoppers. INTRODUCTION 0 Some methods previously utilized for testing resistance of textiles to insect pests relied solely on loss of mass of the 3.4 Balance capable of determining mass to an accuracy test specimens exposed to larvae as the criterion of damage of 0,1 mg. and this is, of course, the most objective result which can be obtained. However, with pile fabrics, if the larvae cut the roots of the pile or nap, significant loss of pile can Stamp of diameter 40 ± 1,5 mm for punching circular 3.5 sometimes be caused before the larvae die. In this case, the test specimens. loss in mass of the test specimen may be above the generally acceptable limit although no damage is visible to the naked eye, and the fabric may be accepted as adequately proofed. Conversely, fabrics with a smooth milled surface, and fine 4 CONDITIONING, REARING AND TESTING ATMOS. knitwear, may have a loss in mass below the acceptable PHERE limit, but still show enough damage for them to be assessed as insufficiently proofed. Thus although determinations of The atmosphere for conditioning, rearing and testing shall have a relative humidity of 65 ± 2 % and a temperature as mass are recorded in this method, subjective visual obser- vations on the condition of the fabric and larvae play an specified below, depending on the type of insect or pest. equal part in the assessment. In most cases the losses in Attagenus piceus mass will reinforce the visual observations. 27±1°℃ Anthrenus flavipes 24±1°c Tineola bisselliella 1 SCOPE AND FIELD OF APPLICATION 25 ± 1°c Tinea pellionella This International Standard specifies a method for the determination of the resistance of textiles to the larvae of certain insects. It is applicable to all textiles containing animal fibre in any proportion. Information relating to the 5 SPECIMENS breeding of the larvae is given in the annex. 5.1 Number 2 PRINCIPLE 5.1.1 Test