1、BRITISH STANDARD BS EN ISO 3344:1997 Reinforcement products Determination of moisture content The European Standard EN ISO3344:1997 has the status of a BritishStandard ICS 59.100.01BSENISO3344:1997 This BritishStandard, having been prepared under the directionof the Sector Board forMaterials and Che
2、micals, waspublished under the authorityofthe Standards Boardand comesinto effect on 15July1997 BSI 03-2000 ISBN 0 580 27867 0 National foreword This BritishStandard is the English language version of EN ISO3344:1997. Itis identical with ISO3344:1997. The UK participation in its preparation was entr
3、usted to Technical Committee PRI/42, Fibre reinforced thermosetting plastics and prepregs, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK
4、interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally includ
5、e an annex which lists normative references to international publications with their corresponding European publications. The BritishStandards which implement these international or European publications may be found in the BSI Standards Catalogue under the section entitled “International Standards
6、Correspondence Index”, or using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does
7、not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN ISO title page, page2, the ISO title page, pagesii toiv, pages1 to3 anda back cover. This standard has been updated (see copyright date) and may
8、have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSENISO3344:1997 BSI 03-2000 i Contents Page National foreword Inside front cover Foreword 2 Foreword iii Text of ISO 3344 1ii blankEUR
9、OPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 3344 May 1997 ICS 83.120 Descriptors: See ISO document English version Reinforcement products Determination of moisturecontent (ISO3344:1997) Produits de renfort Dtermination dutauxdhumidit (ISO3344:1997) Verstrkungserzeugnisse Bestimmung desFeuc
10、htegehaltes (ISO3344:1997) This European Standard was approved by CEN on1997-05-10. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists an
11、d bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. The European Standards exist in three official versions (English, French, German). A version in any other language made by translation under the responsibil
12、ity of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherland
13、s, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1997 CEN All rights of exploitation in any form and by any means reserv
14、ed worldwide for CEN national Members. Ref. No. EN ISO3344:1997 EENISO3344:1997 BSI 03-2000 2 Foreword The text of the International Standard ISO3344:1997 has been prepared by Technical Committee ISO/TC61 “Plastics” in collaboration with Technical Committee CEN/TC249 “Plastics”, the secretariat of w
15、hich is held by IBN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November1997, and conflicting national standards shall be withdrawn at the latest by November1997. According to the CEN/CENELEC
16、 Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzer
17、land and theUnitedKingdom. Endorsement notice The text of the International Standard ISO3344:1997 was approved by CEN as a EuropeanStandard without any modification.ENISO 3344:1997 ii BSI 03-2000 Contents Page Foreword iii 1 Scope 1 2 Normative reference 1 3 Definition 1 4 Principle 1 5 Apparatus 1
18、6 Selection and number of test specimens 1 6.1 Selection of specimens 1 6.1.1 Continuous-filament yarn, spun yarn, rovings 1 6.1.2 Chopped strands and milled fibres 1 6.1.3 Woven fabrics 1 6.1.4 Mats 2 6.2 Number of specimens 2 7 Conditioning and test atmosphere 2 8 Procedure 2 8.1 Weighing the spec
19、imen holder 2 8.2 Initial mass of specimen 2 8.3 Final (dry) mass 3 9 Expression of results 3 10 Precision 3 11 Test report 3 Table 1 2 Descriptors: Plastics, reinforced plastics, reinforcing materials, textile glass fibres, carbon fibres, aramid fibres, reinforcement (structures), rovings, strands,
20、 mats, fabrics, tests, determination of content, humidity.ENISO 3344:1997 BSI 03-2000 iii 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 ou
21、t through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO co
22、llaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval
23、 by at least75% of the member bodies casting a vote. International Standard ISO3344 was prepared by Technical Committee ISO/TC61, Plastics, Subcommittee SC13, Composites and reinforcement fibres. This second edition cancels and replaces the first edition (ISO3344:1977), which has been technically re
24、vised.iv blankENISO 3344:1997 BSI 03-2000 1 1 Scope This International Standard specifies a method for the determination of the moisture content of reinforcement products, such as continuous-filament yarn, staple-fibre yarn, rovings, chopped strands, mats, fabrics and other forms of reinforcement ma
25、de from textile glass, carbon or aramid fibres. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the edition indicated was valid. All standards are subject to revi
26、sion, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO291:, Plastics Standard atm
27、ospheres for conditioning and testing 1) . 3 Definition For the purposes of this International Standard, the following definition applies: 3.1 moisture content the mass of water contained in a product, determined by a specified method and expressed as a percentage of the mass of the moist product 4
28、Principle A test specimen is weighed at ambient temperature, before and after drying at a temperature of105 C. 5 Apparatus 5.1 Forced-circulation oven, with an air-change rate of20 to50 times per hour and capable of maintaining a temperature of105 C 3 C or the chosen temperature to within 3 C (see c
29、lause4). 5.2 Desiccator, containing a suitable drying agent (for example silica gel, calcium chloride or phosphorus pentoxide). 5.3 Specimen holder, made of heat-resistant material, allowing the maximum air flow round the specimen and from which there is no loss of material. This may be a porcelain
30、crucible, an unoxidisable metal wire basket, etc. NOTEOne holder may be used to hold several specimens if they can be transferred from the holder to the oven without loss of material. 5.4 Stainless-steel tweezers, for handling the specimen and specimen holder. 5.5 Balance, accurate to0,1mg. 5.6 Poli
31、shed metal template and suitable cutting tool, e.g.a knife, scissors or a rotary cutting disc (forfabrics and mats). These two items may be replaced by a punch. 5.7 Stoppered weighing bottle, for weighing aramid yarn and when the specimen is expected to have a moisture content higher than0,2% (forex
32、ample,specimens taken from the centre of a package or wet chopped strands). 6 Selection and number of test specimens 6.1 Selection of specimens Unless indicated otherwise in the product specification or by the person requesting the determination, take the specimens as described below: 6.1.1 Continuo
33、us-filament yarn, spun yarn, rovings The way in which the test specimens are taken is intended to enable the moisture content in the surface layers of the wound package to be checked. Unwind and discard the outer layers, then, for each specimen, take a length of the wound package with a mass of at l
34、east5g, but preferably between15g and30g. In cases when the moisture content of the wound package is liable to increase towards the centre, the product specification, or the person requesting the determination, may stipulate that the determination be carried out on one or more specimens taken at one
35、 or more specified locations within the package. Care should be taken to avoid injury when cutting into a package in order to reach the specimen position at the centre. Weigh specimens taken in this way as quickly as possible. For this purpose, the specimen may be placed in a previously weighed weig
36、hing bottle(5.7). 6.1.2 Chopped strands and milled fibres Each specimen shall have a mass of at least5g, but preferably between15g and30g. 6.1.3 Woven fabrics Take a piece of fabric of sufficient size to allow specimens of area100cm 2to be obtained. If the mass of the specimen is less than5g, either
37、 take larger specimens or use several adjacent100cm 2specimens. 1) To be published. (Revision of ISO291:1977)ENISO 3344:1997 2 BSI 03-2000 Specimens may have the same dimensions as those used for the determination of the mass per unit area. Do not take specimens at a distance of less than10mm from t
38、he edges or selvedges of the fabric. If the specimen has to be folded, this shall not impede good air circulation round the whole specimen. It is recommended that specimens be cut out using a template and cutting tool, or with a punch (see5.6), so as to avoid losing material. 6.1.4 Mats The recommen
39、ded specimen shape is that specified for the determination of the mass per unit area, i.e.a square cut out using a template of side316mm 1mm. Other specimen shapes may be stipulated in the product specification or by the person requesting the determination. 6.2 Number of specimens Unless indicated o
40、therwise, the number of specimens taken from each elementary unit 2)or laboratory sample 3)shall be as specified in Table 1. Table 1 The product specification or the person requesting the determination may stipulate that the determination be performed on a (specified) higher number of specimens whic
41、h are generally taken from adjacent positions in the elementary unit or laboratory sample. Moreover, it may be stipulated that the determination be repeated at different places within the elementary unit or laboratory sample. 7 Conditioning and test atmosphere For products which are expected to have
42、 a moisture content below0,2%, condition the elementary unit or laboratory sample in a standard atmosphere as defined in ISO291 for a time sufficient to reach equilibrium, usually a minimum of6h. For products with a moisture content in excess of0,2%, carry out the determination rapidly after samplin
43、g, storing the elementary units or laboratory samples in a hermetically sealed container. The material may be brought to standard temperature in the container prior to testing, but shall be sealed against moisture loss. In addition, the sample shall, if applicable, be remixed within the container ju
44、st prior to testing to avoid erroneous results which occur due to layering of the moisture within the material. 8 Procedure The procedure described below is written for the case when the specimen is weighed in its holder. Inthe case when the specimen is weighed alone, proceed directly to8.2 bearing
45、in mind that the specimen is taken from the holder to weigh it and placed back in the holder using tweezers. Ensure that the specimens are placed in their holder at a location which can be identified throughout the procedure, and so that they do not touch each other. 8.1 Weighing the specimen holder
46、 Stabilize the mass of the holder(5.3) by placing it in the oven(5.1), maintained, to within 3 C, a temperature of105 C or, if the reinforcement product is known to contain volatile matter other than water which may escape at105 C, a lower temperature is chosen. However, the drying temperature chose
47、n may be not below50 C. Handlethe holder with tweezers(5.4). Allow the holder to cool in the desiccator(5.2) to the appropriate standard temperature as defined in ISO291. Weigh the holder to the nearest0,1mg, recording the mass, in grams, as m 0 . 8.2 Initial mass of specimen Immediately after cutti
48、ng out the specimen, place it in the holder. Weigh the specimen and holder together to the nearest0,1mg, recording the mass, in grams, as m 1 . 2) The elementary unit (as defined in ISO1886:1990, Reinforcement fibres Sampling plans applicable to received batches) is the smallest normally commerciall
49、y available entity of a given product. 3) A laboratory sample is a part of the elementary unit from which the specimen(s) will be selected for the test. A laboratory sample is taken when it is impractical to bring the elementary unit into the test laboratory. Reinforcement product Number of specimens Continuous or discontinuous filaments Rovings 1 specimen Chopped strands Milled fibres 1 specimen Woven fabrics Mats 3 specimens per metre width, spaced evenly across the widthENISO 3344:1997 BSI 03-2000 3 8.3 Final (dry) mass Place the spe
