EN 12436:2001
(Main)Adhesives for load-bearing timber structures - Casein adhesives - Classification and performance requirements
Adhesives for load-bearing timber structures - Casein adhesives - Classification and performance requirements
This European Standard specifies performance requirements and the appropriate test methods for casein adhesives for the manufacture of load-bearing wooden structures for use under indoor conditions in heated and ventilated buildings.
This standard is not applicable to casein adhesives used for bonding woods with a density exceeding 750 kg/m3.
Klebstoffe für tragende Holzbauteile - Kaseinklebstoffe - Klassifizierung und Leistungsanforderungen
Diese Europäische Norm legt Leistungsanforderungen und geeignete Prüfverfahren für Kaseinklebstoffe fest, die für die Herstel-lung tragender Holzbauteile zur Verwendung im Innenbereich beheizter und belüfteter Gebäude verwen-det werden.
Diese Norm gilt nicht für Kaseinklebstoffe, die zur Verklebung von Holz mit einer Rohdichte über 750 kg/m3 eingesetzt werden.
Colles pour structures portantes en bois - Colles caséine - Classification et exigences de performance
La présente Norme européenne spécifie les exigences de performance et la méthodes d'essai appropriée pour les adhésifs caséine destinés à la fabrication de structures portantes en bois pour usage en conditions intérieures dans des bâtiments chauffés et ventilés.
La présente norme ne s'applique pas aux adhésifs caséine utilisés pour l'assemblage de bois dont la masse volumique excède 750 kg/m3.
Lepila za nosilne lesene konstrukcije - Kazeinska lepila - Razvrstitev in zahteve kakovosti
General Information
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Lepila za nosilne lesene konstrukcije - Kazeinska lepila - Razvrstitev in zahteve kakovostiKlebstoffe für tragende Holzbauteile - Kaseinklebstoffe - Klassifizierung und LeistungsanforderungenColles pour structures portantes en bois - Colles caséine - Classification et exigences de performanceAdhesives for load-bearing timber structures - Casein adhesives - Classification and performance requirements91.080.20Lesene konstrukcijeTimber structures83.180LepilaAdhesivesICS:Ta slovenski standard je istoveten z:EN 12436:2001SIST EN 12436:2002en01-september-2002SIST EN 12436:2002SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12436November 2001ICS 83.180English versionAdhesives for load-bearing timber structures - Casein adhesives- Classification and performance requirementsColles pour structures portantes en bois - Colles caséine -Classification et exigences de performanceKlebstoffe für tragende Holzbauteile - Kaseinklebstoffe -Klassifizierung und LeistungsanforderungenThis European Standard was approved by CEN on 30 September 2001.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,Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2001 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12436:2001 ESIST EN 12436:2002
Type and duration of exposure cycles.7Annex B
(normative)
Test methods for the determination of the resistance of casein adhesivefilms to mould growth.8SIST EN 12436:2002
Adapted from EN 923.4 SafetyPersons using this standard shall familiar with normal laboratory practice.This standard does not purport to address all the safety problems, if any, associated with its use.It is the responsibility of the user to establish safety and health practices and to ensure compliance with anyEuropean or national regulatory conditions.5 Climatic conditionsCasein adhesives are suitable for use at temperatures not exceeding 50 C and under climatic conditions of use,equivalent to 85 % relative humidity at 20 C, that result in a moisture content in softwoods and most hardwoods of20 %, and somewhat lower in wood-based panels.SIST EN 12436:2002
The adhesive shall be supplied in the form of a dry powder, of which a minimum of 50 % shall be casein.When prepared with water only, in accordance with the manufacturer's instructions, it shall yield a homogenousliquid, free from grit, and of a consistency suitable for spreading.6.1.2
The adhesive powder shall contain a preservative in an amount which has been proved to protect againstmould contamination when tested in accordance with annex B.6.1.3
All adhesives shall be tested by the shear test (see 6.2) using bonded test specimens made from beech.Preparation and testing of the bonded test specimens shall be carried out in accordance with EN 302-1.If the adhesive is specifically claimed to be suitable for use with particular hardwood species, it shall also be testedon bonded test specimens made from that or those species.6.2 Resistance to shear forcesThe shear failing load of close contact and gap joints after the three conditioning treatments specified in annex Ashall be tested in accordance with EN 302-1 except that the test report shall be as given in clause 7 of thisstandard.a) Joints made with beechwoodThe strength of joints shall be as given in Table 1.Table 1 — Minimum failing loads for close contact joints (0,1 mm) and gap joints (1 mm ± 0,1 mm) onbeechwoodTreatment(see annex A)Minimum failing loadNClose contact jointsGap jointsA.12 0001 600A.21 2001 000A.31 6001 300b) Joints made on other hardwood speciesIf the adhesive is tested on other hardwood species (see 6.1.3) with a density not exceeding 750 kg/m3, thestrength of joints shall be as given in Table 1.SIST EN 12436:2002
ScopeThis annex specifies methods of determining the effect of mould contamination on casein adhesive films, byexposure to cultures of selected species of mould grown on agar plates.WARNING
The following procedures use microorganisms that can constitute a health hazard. It is essentialthat these tests be carried out in properly equipped microbiological laboratories by appropriately trainedpersonnel.B.2
PrincipleThe tests for resistance of adhesive films to mould attack provide an indication of whether the adhesive will carryinto the glue line sufficient anti-mould properties to prevent attack by moulds which occur naturally in wood.B.3 ApparatusB.3.1 Antibiotic sensitivity disks1), 13 mm in diameter.B.3.2 Cylinder, 500 ml capacity, graduated in 5 ml subdivisions.B.3.3 Constant temperature chamber, capable of being maintained at (28 ± 0,5) C or (25 ± 0,5) C, or twochambers, if needed simultaneously.B.3.4 Desiccators, two, about 250 mm in inside diameter and 200 mm in height, with perforated porcelain plates tosupport the culture plates.B.3.5 Glass rods, approximately 300 mm in length, having a diameter of approximately 6 mm.B.3.6 Glass rod, L-shaped, having the same dimensions as those in B.3.5, bent into an L at approximately 70 mm.B.3.7 Jar, round, approximately 150 mm in height by 90 mm in inside diameter.B.3.8 Petri dishes, with lid, with approximate dimensions of 100 mm diameter and height 15 mm, either sterilizableglass or pre-sterilized.B.3.9 Pipettes, sterile, disposable, capable of delivering 0,1 ml, 1 ml, or 3 ml; or a 3 ml pipette, borosilicate,graduated in 0,1 ml subdivisions.B.3.10 Platinum loop.B.3.11 Sterile or sterilizable screw cap bottles and caps, having a capacity of approximately 250 ml.2)
1) An example of a suitable type is code no. 1571-33-8 supplied by Difco Laboratories Ltd. P.O. Box 14 B, Central Avenue, East Molesey, Surrey KT80SE. This information is given for the convenience of users of this European Standard and does not constitute an endorsement by CEN of the productnamed.SIST EN 12436:2002
MaterialsB.4.1 Potato-dextrose agar.3)B.4.2 Tartaric acid (sterile 10 % solution).B.4.3 Sterile water.B.4.4 Dioctyl sodium sulfosuccinate.4)B.5 PrecautionsThese test methods employ live cultures of mould. Use proper microbiological procedures in order to preventcontamination of the equipment and the work area. Also, ensure that biologically aseptic conditions prevailthroughout the preparation of the inoculae and the conduct of the tests. To avoid contamination of the adhesivesample and control, ensure that all apparatus coming into direct contact with them is sterile. In addition, clean andsterilize all spills and all equipment coming into contact with the cultures and the inoculated adhesive testspecimens. Media not necessarily designed for pathogens may support their growth so that great care is neededfor the handling and disposal of all cu
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