SIST EN 15534-1:2014
(Main)Composites made from cellulose-based materials and thermoplastics (usually called wood-polymer composites (WPC) or natural fibre composites (NFC)) - Part 1: Test methods for characterisation of compounds and products
Composites made from cellulose-based materials and thermoplastics (usually called wood-polymer composites (WPC) or natural fibre composites (NFC)) - Part 1: Test methods for characterisation of compounds and products
EN 15534-1 specifies test methods for the determination of properties of composites made from cellulose-based materials and thermoplastics, usually called wood-polymer composites (WPC) or natural fibre composites (NFC). This part of EN 15534 is applicable to cellular or non-cellular compounds and products, made from cellulose-based materials and thermoplastics, intended to be or being processed through plastics processing techniques, without threshold for the cellulose-based material content. All the properties listed in this part of EN 15534 are not necessarily assessed for a given application. Test parameters and requirements of the test methods for a given application are specified in the relevant part of EN 15534. Profiles for the management of electrical power cables, communication cables and power track systems used for the distribution of electrical power, profiles for windows or doors and profiles for guttering are not covered by EN 15534.
Verbundwerkstoffe aus Cellulose haltigen Materialien und Thermoplasten (üblicherweise Holz-Polymer-Werkstoffe (WPC) oder natürliche Faserverbundwerkstoffe (NFC) genannt) - Teil 1: Prüfverfahren zur Beschreibung von Formmassen und Erzeugnissen
Dieser Teil von EN 15534 legt Prüfverfahren fest zur Bestimmung der Eigenschaften von Verbundwerkstoffen aus Cellulose haltigen Materialien und Thermoplasten, üblicherweise Holz-Polymer-Werkstoffe (WPC) oder Naturfaser¬verbundwerkstoffe (NFC) genannt.
ANMERKUNG 1 Aus redaktionellen Gründen wird in EN 15534 die Abkürzung „WPC“ für „Verbundwerkstoffe aus Cellulose haltigen Materialien und Thermoplasten“ verwendet.
Dieser Teil gilt für geschäumte oder nicht geschäumte Verbundwerkstoffe und Erzeugnisse, die aus Cellulose haltigen Materialien und Thermoplasten hergestellt sind, die durch plastische Verarbeitungsverfahren hergestellt wurden oder dafür vorgesehen sind, ohne Beschränkung für den Anteil an Cellulose haltigen Materialien.
Jedoch brauchen für einen gegebenen Anwendungsfall nicht notwendigerweise alle in diesem Teil von EN 15534 aufgeführten Eigenschaften bewertet zu werden. Die Prüfverfahren und Anforderungen sind in dem entsprechenden Teil von EN 15534 festgelegt.
ANMERKUNG 2 Für Anwendungen in tragenden Konstruktionen, sind in prCEN/TS 15534 2 [1] Modifizierungsfaktoren der Biegeeigenschaften von Profilen festgelegt.
Profile, die zur Verlegung von Stromkabeln, Kommunikationskabeln und Stromschienensystemen für die Verteilung von Strom verwendet werden, Profile für Fenster oder Türen und Profile für Regenrinnen werden in EN 15534 ) nicht behandelt.
Composites à base de matières cellulosiques et de thermoplastiques (communément appelés composites bois-polymères (WPC) ou composites fibres d'origine naturelle (NFC)) - Partie 1: Méthodes d'essai pour la caractérisation des compositions et des produits
La présente partie de l'EN 15534 spécifie les méthodes d'essai pour la détermination des propriétés des composites à base de matières cellulosiques et de thermoplastiques, communément appelés composites bois-polymères (WPC) ou composites fibres d'origine naturelle (NFC).
NOTE 1 Pour des raisons éditoriales, dans l'EN 15534, l'abréviation « WPC » est utilisée pour « composites à base de matières cellulosiques et de thermoplastiques ».
La présente partie s'applique aux compositions et produits expansés ou non expansés à base de matières cellulosiques et de thermoplastiques, destinés à être fabriqués ou fabriqués au moyen de techniques de transformation des plastiques, sans seuil pour la teneur en matières cellulosiques.
Il n'est pas nécessairement requis pour une application donnée d'évaluer toutes les propriétés énumérées dans la présente partie de l'EN 15534. Les paramètres d'essai et les exigences relatives aux méthodes d'essai pour une application donnée sont spécifiés dans la partie pertinente de l'EN 15534.
NOTE 2 Pour les applications porteuses, les facteurs de modification relatifs aux propriétés en flexion des profilés sont définis dans le prCEN/TS 15534 2 [1].
L'EN 15534 ne traite pas des profilés pour la gestion des câbles d'énergie électrique, des câbles de communication et des systèmes de conducteurs préfabriqués utilisés pour la distribution de l'énergie électrique, des profilés pour les fenêtres ou les portes ni des profilés pour gouttières ).
Kompoziti iz materialov na celulozni podlagi in plastomerov (navadno imenovani lesno-polimerni kompoziti (WPC) ali kompoziti iz naravnih vlaken (NFC)) - 1. del: Preskusne metode za karakterizacijo spojin in proizvodov
Standard EN 15534-1 določa preskusne metode za ugotavljanje lastnosti kompozitov iz materialov na celulozni podlagi in plastomerov, navadno imenovanih lesno-polimerni kompoziti (WPC) ali kompoziti iz naravnih vlaken (NFC). Ta del standarda EN 15534 velja za celulozne ali necelulozne spojine in izdelke iz materialov na celulozni podlagi in plastomerov, ki so namenjeni za obdelavo ali so obdelani s tehnikami za obdelavo plastike, brez omejitve za vsebnost materialov na celulozni podlagi. Za posamezno uporabo ni treba nujno oceniti vseh lastnosti, navedenih v tem delu standarda EN 15534. Preskusni parametri in zahteve preskusnih metod za posamezno uporabo so navedeni v ustreznem delu standarda EN 15534. Profili za razvrščanje električnih napajalnih kablov, komunikacijskih kablov in napajalnih tračnih sistemov, ki se uporabljajo za distribucijo električne energije, profili za okna ali vrata in profili za žlebove niso zajeti v standardu EN 15534.
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kompoziti iz materialov na celulozni podlagi in plastomerov (navadno imenovani lesno-polimerni kompoziti (WPC) ali kompoziti iz naravnih vlaken (NFC)) - 1. del: Preskusne metode za karakterizacijo spojin in proizvodovVerbundwerkstoffe aus Cellulose haltigen Materialien und Thermoplasten (üblicherweise Holz-Polymer-Werkstoffe (WPC) oder natürliche Faserverbundwerkstoffe (NFC) genannt) - Teil 1: Prüfverfahren zur Beschreibung von Formmassen und ErzeugnissenComposites à base de matières cellulosiques et de thermoplastiques (communément appelés composites bois-polymères (WPC) ou composites fibres d'origine naturelle (NFC)) - Partie 1: Méthodes d'essai pour la caractérisation des compositions et des produitsComposites made from cellulose-based materials and thermoplastics (usually called wood-polymer composites (WPC) or natural fibre composites (NFC)) - Part 1: Test methods for characterisation of compounds and products83.140.99Drugi izdelki iz gume in polimernih materialovOther rubber and plastics products79.080Polizdelki iz lesaSemi-manufactures of timberICS:Ta slovenski standard je istoveten z:EN 15534-1:2014SIST EN 15534-1:2014en,fr,de01-maj-2014SIST EN 15534-1:2014SLOVENSKI
STANDARDSIST-TS CEN/TS 15534-1:20071DGRPHãþD
SIST EN 15534-1:2014
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 15534-1
January 2014 ICS 79.080; 83.080.01; 83.140.99 Supersedes CEN/TS 15534-1:2007English Version
Composites made from cellulose-based materials and thermoplastics (usually called wood-polymer composites (WPC) or natural fibre composites (NFC)) - Part 1: Test methods for characterisation of compounds and products
Composites à base de matières cellulosiques et de thermoplastiques (communément appelés composites bois-polymères (WPC) ou composites fibres d'origine naturelle (NFC)) - Partie 1: Méthodes d'essai pour la caractérisation des compositions et des produits
Verbundwerkstoffe aus cellulosehaltigen Materialien und Thermoplasten (üblicherweise Holz-Polymer-Werkstoffe (WPC) oder Naturfaserverbundwerkstoffe (NFC) genannt) -Teil 1: Prüfverfahren zur Beschreibung von Compounds und Erzeugnissen This European Standard was approved by CEN on 9 November 2013.
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 and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC 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 translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 15534-1:2014 ESIST EN 15534-1:2014
EN 15534-1:2014 (E) 2 Contents Page Foreword .4 Introduction .5 1 Scope .6 2 Normative references .6 3 Terms and definitions .8 4 Test specimens .9 5 Conditioning of test specimens .9 5.1 General .9 5.2 Reference conditioning .9 5.3 Conditioning for factory production control and testing under other conditions . 10 5.4 Conditioning for tests performed by third-parties . 10 6 Physical properties . 10 6.1 Appearance (applicable to products) . 10 6.2 Density . 10 6.3 Moisture content . 10 6.4 Slipperiness . 11 6.4.1 General . 11 6.4.2 Pendulum test . 11 6.4.3 Inclination plan test . 11 6.4.4 Dynamic coefficient of friction . 12 6.5 Linear mass (applicable to profiles) . 12 6.5.1 Apparatus . 12 6.5.2 Test specimens . 12 6.5.3 Procedure . 13 6.5.4 Calculation and expression of results . 13 6.6 Dimensional characteristics . 13 6.6.1 Conditioning . 13 6.6.2 Thickness, width and length (applicable to profiles, only). 13 6.6.3 Deviation from straightness (applicable to profiles, only) . 13 6.6.4 Cupping . 14 7 Mechanical properties . 14 7.1 Impact resistance. 14 7.1.1 Impact resistance (applicable to compounds) . 14 7.1.2 Falling mass impact resistance (applicable to products). 15 7.1.3 Extreme temperatures . 18 7.2 Tensile properties (applicable to compounds) . 18 7.3 Flexural properties. 18 7.3.1 Flexural properties (applicable to compounds) . 18 7.3.2 Flexural properties (applicable to non-load bearing products) . 18 7.4 Creep behaviour (applicable to finished products for non-load bearing applications) . 19 7.4.1 Known span in use . 19 7.4.2 Unknown span in use . 20 7.5 Resistance to indentation . 21 7.5.1 Principle . 21 7.5.2 Apparatus . 21 7.5.3 Test specimens . 21 SIST EN 15534-1:2014
EN 15534-1:2014 (E) 3 7.5.4 Test method . 21 7.6 Nail and screw withdrawal . 22 7.7 Pull through resistance . 22 8 Durability . 23 8.1 Resistance to artificial weathering . 23 8.1.1 Test methods for artificial weathering . 23 8.1.2 Methods for assessing of the resistance to artificial weathering . 23 8.2 Resistance to natural ageing (external use) . 23 8.2.1 Test methods for natural ageing . 23 8.2.2 Methods for assessing the resistance to natural ageing . 24 8.3 Moisture resistance . 24 8.3.1 Swelling and water absorption . 24 8.3.2 Moisture resistance under cyclic conditions . 26 8.3.3 Moisture resistance – Boiling test . 27 8.4 Resistance against termites . 27 8.5 Resistance against biological agents . 28 8.5.1 Pre-treatment . 28 8.5.2 Resistance against basidiomycetes . 28 8.5.3 Resistance against soft rotting micro-fungi . 31 8.5.4 Resistance against discolouring micro-fungi according to ASTM D 3273 . 32 8.5.5 Resistance against discolouring micro-fungi according to ISO 16869 . 34 8.5.6 Resistance against discolouring algae . 35 8.6 Resistance to salt spray . 35 9 Thermal properties . 36 9.1 Heat deflection temperature (HDT) . 36 9.2 Linear thermal expansion . 36 9.3 Heat reversion . 36 9.4 Heat build-up (applicable to products) . 36 9.4.1 Principle. 36 9.4.2 Apparatus . 36 9.4.3 Test specimens . 37 9.4.4 Procedure . 37 9.4.5 Expression of results . 38 9.4.6 Test report . 39 9.5 Oxygen index (OI) . 39 9.6 Reaction to fire . 39 9.6.1 Single flame source test . 39 9.6.2 Single burning item (SBI) test (applicable to cladding only) . 39 9.6.3 Radiant heat source test (floorings) . 46 10 Other properties . 46 10.1 Degree of chalking (applicable to coated products, only) . 46 10.2 Change of gloss . 46 10.3 Peel strength (applicable to profiles with laminated foil) . 46 10.3.1 Principle. 46 10.3.2 Apparatus . 47 10.3.3 Preparation of test pieces. 47 10.3.4 Conditioning . 48 10.3.5 Procedure . 48 10.3.6 Test report . 48 Annex A (normative)
Determination of the modulus of elasticity in bending and bending strength of profiles . 50 Bibliography . 57
SIST EN 15534-1:2014
EN 15534-1:2014 (E) 4 Foreword This document (EN 15534-1:2014) has been prepared by Technical Committee CEN/TC 249 “Plastics”, the secretariat of which is held by NBN. 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 July 2014, and conflicting national standards shall be withdrawn at the latest by July 2014. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes CEN/TS 15534-1:2007. The significant changes that have been made since the previous edition are the following: — change of the status from Technical Specification to European Standard; — complete technical review of the test methods. EN 15534 consists of the following parts: — EN 15534-1, Composites made from cellulose-based materials and thermoplastics (usually called wood-polymer composites (WPC) or natural fibre composites (NFC)) — Part 1: Test methods for characterization of compounds and products — prEN 15534-2, Composites made from cellulose-based materials and thermoplastics (usually called wood-polymer composites (WPC) or natural fibre composites (NFC)) — Part 2: Characterization of compounds1) — EN 15534-4, Composites made from cellulose-based materials and thermoplastics (usually called wood-polymer composites (WPC) or natural fibre composites (NFC)) — Part 4: Specifications for decking profiles and tiles — EN 15534-5, Composites made from cellulose-based materials and thermoplastics (usually called wood-polymer composites (WPC) or natural fibre composites (NFC)) — Part 5: Specifications for cladding profiles and tiles — prEN 15534-6, Composites made from cellulose-based materials and thermoplastics (usually called wood-polymer composites (WPC) or natural fibre composites (NFC)) — Part 6: Specifications for fencing profiles and systems1) — prEN 15534-7, Composites made from cellulose-based materials and thermoplastics (usually called wood-polymer composites (WPC) or natural fibre composites (NFC)) — Part 7: Specifications for general purpose profiles in external applications1) According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
1) In preparation. SIST EN 15534-1:2014
EN 15534-1:2014 (E) 5 Introduction The denomination “wood-polymer composites”, WPC, is usually used to designate materials or products consisting of one or more natural fibres or flours and one or a mixture of polymer(s). Natural fibres and flours come from different plant sources (e.g. wood, hemp, flax, sisal, coconut, cotton, kenaf, jute, abaca, banana leaf fibres, bamboo, rice, wheat straw or other fibrous material) and different polymers, virgin or recycled, are used. Currently, the most commonly used polymers are poly(vinyl chloride) (PVC), polypropylene (PP) and polyethylene (PE). WPC materials can be processed by different techniques, as extrusion for profiles, calendering for films and sheets, injection moulding or compression moulding. The contents of natural fibres and polymers depend on the application and the processing techniques. WPC materials may be considered neither as filled plastics nor as a special kind of wood. They should be considered as different materials having their own characteristics. For the moment, the main applications of WPC products are decking, cladding, panelling and fencing and furniture. SIST EN 15534-1:2014
EN 15534-1:2014 (E) 6 1 Scope This European Standard specifies test methods for the determination of properties of composites made from cellulose-based materials and thermoplastics, usually called wood-polymer composites (WPC) or natural fibre composites (NFC). NOTE
For editorial reasons, in EN 15534 the abbreviation “WPC” is used for “composites made from cellulose-based materials and thermoplastics”. This part of EN 15534 is applicable to cellular or non-cellular compounds and products, made from cellulose-based materials and thermoplastics, intended to be or being processed through plastics processing techniques, without threshold for the cellulose-based material content. All the properties listed in this part of EN 15534 are not necessarily assessed for a given application. Test parameters and requirements of the test methods for a given application are specified in the relevant part of EN 15534. Profiles for the management of electrical power cables, communication cables and power track systems used for the distribution of electrical power, profiles for windows or doors and profiles for guttering are not covered by EN 155342). 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 84:1997, Wood preservatives - Accelerated ageing of treated wood prior to biological testing - Leaching procedure EN 117:2012, Wood preservatives - Determination of toxic values against Reticulitermes species (European termites) (Laboratory method) EN 152:2011, Wood preservatives - Determination of the protective effectiveness of a preservative treatment against blue stain in wood in service - Laboratory method EN 317, Particleboards and fibreboards - Determination of swelling in thickness after immersion in water EN 321:2001, Wood-based panels - Determination of moisture resistance under cyclic test conditions EN 322:1993, Wood-based panels - Determination of moisture content EN 477:1995, Unplasticized polyvinylchloride (PVC-U) profiles for the fabrication of windows and doors - Determination of the resistance to impact of main profiles by falling mass EN 479, Unplasticized polyvinylchloride (PVC-U) profiles for the fabrication of windows and doors - Determination of heat reversion EN 927-3, Paints and varnishes - Coating materials and coating systems for exterior wood - Part 3: Natural weathering test
2) Profiles that are excluded are in the scopes of standards prepared by CEN/TC 33, CENELEC/TC 213 or CEN/TC 128. SIST EN 15534-1:2014
EN 15534-1:2014 (E) 7 EN 927-6, Paints and varnishes - Coating materials and coating systems for exterior wood - Part 6: Exposure of wood coatings to artificial weathering using fluorescent UV lamps and water EN 1383, Timber structures - Test methods - Pull through resistance of timber fasteners ENV 12038:2002, Durability of wood and wood-based products - Wood-based panels - Method of test for determining the resistance against wood-destroying basidiomycetes EN 13446, Wood-based panels - Determination of withdrawal capacity of fasteners EN 13823, Reaction to fire tests for building products - Building products excluding floorings exposed to the thermal attack by a single burning item EN 13893, Resilient, laminate and textile floor coverings - Measurement of dynamic coefficient of friction on dry floor surfaces CEN/TS 15083-2:2005, Durability of wood and wood-based products - Determination of the natural durability of solid wood against wood-destroying fungi, test methods - Part 2: Soft rotting micro-fungi EN 16472, Plastics - Method for accelerated photoageing using medium pressure mercury vapour lamps EN 20105-A02, Textiles - Tests for colour fastness - Part A02: Grey scale for assessing change in colour (ISO 105-A02) CEN/TS 15676, Wood flooring - Slip resistance - Pendulum test EN ISO 75-1, Plastics - Determination of temperature of deflection under load - Part 1: General test method (ISO 75-1) EN ISO 75-2, Plastics - Determination of temperature of deflection under load - Part 2: Plastics and ebonite (ISO 75-2) EN ISO 178:2010, Plastics - Determination of flexural properties (ISO 178:2010) EN ISO 179-1, Plastics - Determination of Charpy impact properties - Part 1: Non-instrumented impact test (ISO 179-1) EN ISO 291, Plastics - Standard atmospheres for conditioning and testing (ISO 291) EN ISO 472:2013, Plastics - Vocabulary (ISO 472:2013) EN ISO 527-2, Plastics - Determination of tensile properties - Part 2: Test conditions for moulding and extrusion plastics (ISO 527-2) EN ISO 877-2, Plastics - Methods of exposure to solar radiation - Part 2: Direct weathering and exposure behind window glass (ISO 877-2) EN ISO 1183-1, Plastics - Methods for determining the density of non-cellular plastics - Part 1: Immersion method, liquid pyknometer method and titration method (ISO 1183-1) EN ISO 1183-3, Plastics - Methods for determining the density of non-cellular plastics - Part 3: Gas pyknometer method (ISO 1183-3) EN ISO 2813, Paints and varnishes - Determination of specular gloss of non-metallic paint films at 20°, 60° and 85° (ISO 2813) SIST EN 15534-1:2014
EN 15534-1:2014 (E) 8 EN ISO 4589-2, Plastics - Determination of burning behaviour by oxygen index - Part 2: Ambient-temperature test (ISO 4589-2) EN ISO 4628-6, Paints and varnishes - Evaluation of degradation of coatings - Designation of quantity and size of defects, and of intensity of uniform changes in appearance - Part 6: Assessment of degree of chalking by tape method (ISO 4628-6) EN ISO 4892-2:2013, Plastics - Methods of exposure to laboratory light sources - Part 2: Xenon-arc lamps (ISO 4892-2:2013) EN ISO 9227, Corrosion tests in artificial atmospheres - Salt spray tests (ISO 9227) EN ISO 9239-1, Reaction to fire tests for floorings - Part 1: Determination of the burning behaviour using a radiant heat source (ISO 9239-1) EN ISO 11507:2007, Paints and varnishes - Exposure of coatings to artificial weathering - Exposure to fluorescent UV lamps and water (ISO 11507:2007) EN ISO 11925-2, Reaction to fire tests - Ignitability of products subjected to direct impingement of flame - Part 2: Single-flame source test (ISO 11925-2) ISO 7724-1, Paints and varnishes - Colorimetry - Part 1: Principles ISO 7724-2, Paints and varnishes - Colorimetry - Part 2: Colour measurement ISO 7724-3, Paints and varnishes - Colorimetry - Part 3: Calculation of colour differences ISO 11359-2, Plastics - Thermomechanical analysis (TMA) - Part 2: Determination of coefficient of linear thermal expansion and glass transition temperature ISO 16869, Plastics - Assessment of the effectiveness of fungistatic compounds in plastics formulations ASTM D3273–00(2005), Standard Test Method for resistance to Growth of Mold on the Surface of Interior Coatings in an Environmental Chamber CIE3) Publication 51, A method for assessing the quality of daylight simulators for colorimetry 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN ISO 472:2013 and the following apply. 3.1 wood-polymer composite WPC or natural fibre composite NFC material or product made thereof being the result of the combination of one or several cellulose-based material(s) with one or several thermoplastics, intended to be or being processed through plastic processing techniques
3) Commission internationale de l'éclairage, Central Bureau, Kegelgasse 27, A-1030, Vienna, Austria. SIST EN 15534-1:2014
EN 15534-1:2014 (E) 9 3.2 compound clearly defined homogenized mixture of a base polymer
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