SIST EN 212:2004

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Holzschutzmittel - Allgemeine Anleitung für die Probenahme und Probenvorbereitung von Holzschutzmitteln und von behandeltem Holz für die AnalyseProduits de préservation du bois - Guide général d'échantillonnage et de préparation pour l'analyse des produits de préservation du bois et du bois traitéWood preservatives - General guidance on sampling and preparation for analysis of wood preservatives and treated timber71.100.50Wood-protecting chemicalsICS:Ta slovenski standard je istoveten z:EN 212:2003SIST EN 212:2004en01-januar-2004SIST EN 212:2004SLOVENSKI
STANDARDSIST EN 212:19951DGRPHãþD



SIST EN 212:2004



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 212June 2003ICS 71.100.50Supersedes EN 212:1996English versionWood preservatives - General guidance on sampling andpreparation for analysis of wood preservatives and treatedtimberProduits de préservation du bois - Guide générald'échantillonnage et de préparation pour l'analyse desproduits de préservation du bois et du bois traitéHolzschutzmittel - Allgemeine Anleitung für dieProbenahme und Probenvorbereitung vonHolzschutzmitteln und von behandeltem Holz für dieAnalyseThis European Standard was approved by CEN on 21 April 2003.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and UnitedKingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2003 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 212:2003 ESIST EN 212:2004



EN 212:2003 (E)2ContentsForeword.3Introduction.41Scope.52Normative references.53Terms and definitions.54Safety precautions.65Guidance on sampling preservatives.75.1General.75.2Sampling of solid preservatives.85.3Sampling of preservatives in paste form.105.4Sampling of liquid preservatives.106Guidance on sampling treated timber.116.1General.116.2Sampling procedures.127Method for the determination of moisture content of preservative-treated timber.167.1Selection of sample.167.2Apparatus.167.3Procedure.167.4Calculation.168General considerations in converting samples for analysis.179Sampling report.17Bibliography.18SIST EN 212:2004



EN 212:2003 (E)3ForewordThis document (EN 212:2003) has been prepared by the Technical Committee CEN/TC 38 "Durability of wood andwood-based products", the secretariat of which is held by AFNOR.This European Standard shall be given the status of a national standard, either by publication of an identical text orby endorsement, at the latest by December 2003, and conflicting national standards shall be withdrawn at the latestby December 2003.This document supersedes EN 212:1986.Significant technical differences between this edition and EN 212:1986 are as follows:a) addition of a clause "Introduction";b) introduction of a clause "Normative references";c) introduction of a clause "Terms and definitions";d) taking into account the requirements of EN 351-1 and of the guidance of sampling in EN 351-2;e) for thin section samples, use of a specific borer;f) addition of a sampling report.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal,Slovakia, Spain, Sweden, Switzerland and the United Kingdom.SIST EN 212:2004



EN 212:2003 (E)4IntroductionSampling is a vital step in analysis and testing. Its importance is recognized in this European Standard which givesguidance on general methods for the sampling of wood preservatives and preservative-treated timber.Such samples should be representative of the materials under examination and in a form that makes thedetermination of the required data possible.No attempt has been made here to define rigidly any detailed methodology to be followed in operations in theseareas because this may depend upon the nature of the preservative, the method of treatment and the particularrequirements of e.g. national authorities or quality control and certification bodies.Furthermore, the objectives of each analysis, and the demands of the individual analytical techniques, can imposetheir own requirements with regard to sampling and subsequent handling. Therefore, it is essential that thesampling plan for each operation should be devised in the light of the particular objective, using professionaljudgement based on experience.The techniques described can be employed in a wide variety of applications ranging from laboratory research tothe checking of preservatives and treated timber for arbitration purposes.SIST EN 212:2004



EN 212:2003 (E)51 ScopeThis European Standard gives guidance on the general procedures to be followed in the sampling and preparationfor analysis of wood preservatives and preservative-treated timber.This European Standard is applicable to the provision of appropriate samples for analysis which can be used tocheck the content of active and other ingredients in preservative formulations, and the content of active and otheringredients of wood preservatives in treated timber, either before, during or after the service life of the timber.NOTE 1Methods of sampling creosote and creosote-treated timber are described in EN 1014-1, 1014-2 and EN 12490.These are to be used in preference to the recommendations in this European Standard.NOTE 2No attempt has been made in this document to lay down detailed procedures to be adopted for control purposes atmanufacturing plants where large volumes of preservatives are to be sampled. Nor does it attempt to establish procedures forchecking the compliance of batches of treated timber with specifications demanding a defined level of treatment (see 6.2).2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references the latest edition of thepublication referred to applies (including amendments).EN 351-1, Durability of wood and wood-based products – Preservative-treated solid wood – Part 1: Classification ofpreservative penetration and retention.EN 351-2, Durability of wood and wood-based products – Preservative-treated solid wood – Part 2: Guidance onsampling for the analysis of preservative-treated wood.ISO 6206:1979, Chemical products for industrial use – Sampling – Vocabulary.3 Terms and definitionsFor the purposes of this European Standard, the following terms and definitions apply:3.1sampling unitdefined quantity of material having a boundary which may be physical, for example a container, or hypothetical, forexample a particular time or time interval in the case of a stream of materialNOTE 1A number of sampling units may be gathered together, for example in a package or box.NOTE 2In French, the term ”individu” is sometimes used as a synonym of ”unité d’échantillonnage”. In English, the terms”individual”, ”unit” and ”item” are sometimes used in practice as synonyms of ”sampling unit”.[ISO 6206:1979]3.2sampleone or more sampling units taken from a larger number of sampling units, or one or more increments taken from asampling unit[ISO 6206:1979]SIST EN 212:2004



EN 212:2003 (E)63.3representative samplesample assumed to have the same composition as the material sampled when the latter is considered as ahomogeneous whole[ISO 6206:1979]3.4sampling planplanned procedure of selection, withdrawal and preparation of a sample or samples from a lot (3.6) to yield therequired knowledge of the characteristic(s) from the final sample (3.9) so that a decision can be made regardingthe lotNOTEConsiderations of cost, effort and delay usually determine an acceptable sampling plan.[ISO 6206:1979]3.5consignmentquantity of material covered by a particular order or shipping document[Adapted from ISO 6206:1979]3.6lottotal quantity of material to be sampled using a particular sampling plan. A lot can consist of a number ofconsignments, batches or items[Adapted from ISO 6206:1979]3.7batchdefinite quantity of material that can be one item or a number of items that belong together because of theirmanufacture or production under conditions which are presumed to be uniform[Adapted from ISO 6206:1979]3.8bulk samplecollect set of samples which do not maintain their individual identity[ISO 6206:1979]3.9final samplesample obtained or prepared under the sampling plan for possible subdivision into identical portions for testing,reference or storage[ISO 6206:1979]4 Safety precautionsAll preservatives should be considered potentially toxic both to man and to the environment and should be handledwith care and in accordance with the specific recommendations for safe use agreed with National and InternationalAuthorities. The manufacturers’ instructions should also be observed.In handling solid timber after treatment, protective gloves and glasses should be worn if the timber is still wet orcontains solvent. Once the timber has dried, unless preservative residues on the surface are noted, no specialprecautions are necessary in handling such timber, other than the normal practice of washing hands beforehandling food or smoking.SIST EN 212:2004



EN 212:2003 (E)7When treated timber is machined or mechanically sanded or sawn, an efficient dust extraction system should beused or, failing this, the operator should be provided with, and should wear, appropriate respiratory protection.The organic solvents commonly used for applying preservatives are flammable and it is essential that care beexercised in handling such materials.NOTEAttention is drawn to the need to comply with any statutory regulations that govern the use and storage offlammable liquids.5 Guidance on sampling preservatives5.1 GeneralThe method of sampling chosen should ensure that the sample obtained is as representative as possible of thetotal consignment.5.1.1 Suspect consignmentA consignment should be considered suspect if:a) a container is damaged or defective;b) there is any doubt as to the nature of the contents of a container, for example because of the presence of anold label or incorrect markings;c) obvious and unusual variations are observed in the consignment.Such samples should be fully reported and should not be regarded as acceptable without mutual agreementbetween the parties concerned.5.1.2 Number of items in consignmentThe least number of containers, e.g. drums, to be sampled from any given consignment of preservative materials,irrespective of whether the materials are solid or liquid, should be the nearest whole number to the square root ofhalf the total number of containers in the consignment (see Table 1). The containers to be sampled should betaken at random.Table 1 — Sampling of containersNumber of containers inconsignment (x)2xNumber of containers to besampled102,242203,163303,874505,0051007,077SIST EN 212:2004



EN 212:2003 (E)85.1.3 Choice of materials for sample container and sampling devicesIt is essential in all cases that the sampling devices and the sample container and its closure be made frommaterial which is inert to the particular preservative under investigation.NOTE 1Polyethylene containers should not be used for hydrocarbon solvents. Glass containers are recommended.NOTE 2Glass containers should not be used for fluorine and boron based preservatives. Containers of polyethylene arerecommended.5.1.4 Marking and storage of samplesAll sample containers should be clearly and permanently labelled as to their contents. All samples should be storedin their containers in a cool, dark place prior to analysis.5.2 Sampling of solid preservatives5.2.1 Sampling deviceA suitable sampling device for the purpose of sampling the preservative in a drum is a sampling spear of internaldiameter approximately 30 mm and sufficiently long to reach the bottom of the drum.5.2.2 Procedure (see Figure 1)Before sampling, mix the contents of the drum as thoroughly as possible. Take great care to minimize the moisturepicked up by the sample during the sampling, mixing and reducing processes. Using the sampling device, take fivesamples, one from the centre of the drum and the other four from points on a pair of diameters at right angles toeach other, which are mid-way between the centre and the side of each drum selected for testing (operation A).Ensure that the sampling spear reaches to the bottom of the drum.Combine the five samples in a clean, dry, airtight container (operation B). If necessary, grind the whole of the bulksample to pass a test sieve of nominal aperture size 2,00 mm, ensuring that no residue is left on the sieve.NOTETo ascertain the homogeneity of the contents of a drum, individual spear samples can be analysed.SIST EN 212:2004



EN 212:2003 (E)9KeyADrum: Top view, x (sampling points)5Cone 5 (a + c only)2Samples combined6Cone 83Cone 17a + g only4Cone 4NOTERepeat steps E to G as necessary.Figure 1 — Sampling of a solid preservativeSIST EN 212:2004



EN 212:2003 (E)10Mix the sample well (operation C1). Transfer the entire sample to a clean dry surface and heap into a cone(operation C, cone 1). Turn over to form a new cone until the operation has been carried out three times(operation C, cone 4). Form each conical heap by depositing material on the apex of the cone so that the portionswhich slide down the side are distributed as evenly as possible, and that the centre of the cone is not displaced. Ifsome of the larger aggregates of the mixture roll and scatter round the base, either push these back to the edge ofthe heap or break them and distribute them evenly over the heap.Flatten the final cone from the mixed contents of the container by repeated vertical insertions of the edge of aboard, commencing about the centre and working radially round the cone, lifting the board clear of the materialafter each insertion. Carry out this operation so that the flattened heap is of uniform thickness and diameter and thecentre coincides with the centre of the original cone (operation D).Quarter the heap along two diameters which intersect at right angles, using a suitable divider. Shovel one pair ofopposite quarters into a cone and reject the remainder (operation E). Mix the cone three times (operation E,cone 8) as described above, flatten the cone and quarter along two diameters (operation F).Repeat these operations until a reduced sample of about 200 g remains (operation G). Enclose the test sample inan airtight container until required for analysis.5.3 Sampling of preservatives in paste form5.3.1 Sampling deviceA suitable device is a wide-mouthed sampling can of about 500 ml capacity fitted with a long, stiff handle so that itcan be submerged in the material to be sampled. It should also carry a removable lid to which a second stiff handleor cord is attached, so that when the can is immersed in
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