3873 NTERNATIONAL STANDARD TSO INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEXIYHAPOIHAN OPIAHW3ALIWA HIO CTAHIAPTW3ALIWIM.ORGANISATION INTERNATIONALE DE NORMALISATION Industrial safety helmets CasquesdeprotectionpourI'industrie First edition -- 1977-03-01 3873-1977 (E) UDC 614.891.1.004.1 Ref. No. ISO 3873-1977 (E) Descriptors : accident prevention, protection from falling bodies, safety devices, helmets, specifications. 0 ational Organization for Standardization Copyright Inter Price based on 8 pages y IHS und No reproduction or networking permitted 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 developing 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 IsO, aiso 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. international Standard ISO 3873 was drawn up by Technical Committee IsO/Tc 94, Personal safety -- Protective clothing and equipment, and was circulated to the member bodies in August 1975. It has been approved by the member bodies of the following countries : Australia Israel Spain Austria Italy Sweden Bulgaria Mexico Switzerland Denmark Netherlands Turkey France New Zealand United Kingdom Germany Norway U.S.S.R. Hungary Poland Yugoslavia Iran Romania Ireland South Africa, Rep. of The member body of the following.country expressed disapproval of the document on technical grounds : Belgium @ International Organization for Standardization, 1977 Printed in Switzerland No reproduction or networking permited withou license from IHS Not for Resale ISO 3873-1977 (E) INTERNATIONAL STANDARD Industrial safety helmets 1 SCOPE 3.8 helmet accessories : Any additional parts for special purposes such as chin strap, neck protector, nape strap, This International Standard specifies physical and drawlace and attachment devices for lamp and cable. performance requirements, methods of test and marking requirements for industrial safety helmets. 3.9 wearing height : Vertical distance from the lower edge of the headband to the highest point of the head or headform. 2 FIELD OF APPLICATION 3.10 vertical clearance : Vertical distance between the top The mandatory requirements apply to helmets for general of the headform and the inside of the shell. use in industry. Additional optional performance require- ments are included to apply only where specifically called for. 3.11 horizontal clearance : Horizontal distance between the headband and the inside of the shell or any protruding part of the inside of the shell. 3 DEFINITIONS 4 PHYSICAL REQUIREMENTS 3.1 safety helmet : A helmet primarily intended to protect the upper part of a wearer's head against a blow. 4.1 Materials 3.2 shell : The hard, smoothly finished material that Recommendations for general consideration of materials provides the general form of the helmet. are given in annex B. 3.3 peak : A permanent extension of the sheil above the 4.2 General construction eyes. Recommendations for general consideration of construc- tion of helmets are given in annex B. 3.4 brim : A rim surrounding the shell. 4.3 Shell 3.5 harness : The complete assembly by means of which the helmet is maintained in position on the head, and which The shell shall have as uniform a strength as possible and may provide a means of absorbing energy. It consists for shall not be specially reinforced at any point. This does example of the following items : not exclude a gradual increase in shell thickness or ribs or means for attaching the harness but does exclude othe