Fibre-reinforced plastic composites Declaration of raw material characteristics Part 3: Additional requirements for fibre

Transcription

1 CEN/TC 249 N492 Date: pren xxxx-3:2010 CEN/TC 249 Secretariat: NBN Fibre-reinforced plastic composites Declaration of raw material characteristics Part 3: Additional requirements for fibre Einführendes Element Haupt-Element Teil 3: Teil-Titel Élément introductif Élément central Partie 3 : Titre de la partie ICS: Descriptors: Document type: European Standard Document subtype: Document stage: Working Document Document language: E C:\Users\Hubert\Desktop\CEN TC 249 N492.doc STD Version 2.2

2 Contents Page Foreword Scope Normative references Terms and definitions Content of a declaration Additional declaration requirements General Properties of carbon fibre Property of glass fibre Content of Certificate of Analysis (CoA) General CoA for carbon fibre CoA for glass fibre...9 Annex A (informative) Clarification of nominal, maximum and minimum test values A.1 General A.2 Clarification of nominal value A.3 Clarification of minimum and maximum value A.4 Guaranteed minimum and maximum value A.5 Extent of testing Bibliography

3 Foreword This document (pren xxxx-3:2010) has been prepared by Technical Committee CEN/TC 249 Plastics, the secretariat of which is held by NBN. This document is a working document. pren xxx consists of the following parts, under the general title Fibre-reinforced plastic composites Declaration of raw material characteristics: Part 1: General requirements Part 2: Additional requirements for resin, curing systems, additives and modifiers Part 3: Additional requirements for fibres (this part) Part 4: Additional requirements for fabrics Part 5: Additional requirements for core materials 3

4 1 Scope This part of the standard specifies the minimum information to be declared for fibre material to be used for the manufacturing of composites products. These specific declaration requirements are given in addition to the general requirements given in the part 1 of this standard (pren xxx-1). The declaration includes requirements for the certificate of analysis (CoA). The purpose of the CoA is to verify that material properties and quality conforms to the declared values. This part of the standard is applicable to carbon and glass fibre material. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN xxxx-1:20xx, Fibre-reinforced plastics composites Declaration of raw material characteristics Part 1: General requirements EN ISO 291, Plastics Standard atmospheres for conditioning and testing (ISO 291:2008) EN ISO 1889, Reinforced yarns Determination of linear density (ISO 1889:2009) EN ISO 1890, Reinforcement yarns Determination of twist (ISO 1890:2009) EN ISO 2078, Textile glass Yarns Designation (ISO 2078:1993) EN ISO 3344, Reinforcement products Determination of moisture content (ISO 3344:1997) EN ISO 9163, Textile glass Rovings Manufacture of test specimens and determination of tensile strength of impregnated rovings (ISO 9163:2005) EN ISO 10548, Carbon fibre Determination of size content (ISO 10548:2002); EN ISO 10618, Carbon fibre Determination of tensile properties of resin-impregnated yarn (ISO 10618: 2004) ISO 1887, Textile glass Determination of combustible matter content ISO 1888, Textile glass Staple fibres of filaments Determination of average diameter ISO 10119, Carbon fibre Determination of density ISO 15100, Plastics Reinforcement fibres Chopped strands Determination of bulk density ASTM D150, Standard Test Methods for AC Loss Characteristics and Permittivity (Dielectric Constant) of Solid Electrical Insulation ASTM D578, Standard Specification for Glass Fiber Strands ASTM D2970, Standard Test Method for Testing Tire Cords, Tire Cord Fabrics, and Industrial Yarns Made From Glass Filaments 4

5 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 carbon fibre fibres produced by the pyrolysis of organic precursor fibres such as rayon, polyacrylonitrile (PAN), and pitch in an inert atmosphere. NOTE The term is often used interchangeably with graphite, however carbon fibres and graphite fibres differ in the temperature at which the fibres are made and heat-treated, and the amount of carbon produced. Carbon fibres typically are carbonized at about 1300 C and assay at 93 to 95% carbon, while graphite fibres are graphitized at 1900 C to 3000 C and assay at more than 99 % elemental carbon. 3.2 glass fibre fibres made from molten sand and other inorganic materials under highly controlled conditions. 3.3 fibre unit of matter characterized by a high ratio of length to thickness or diameter. 3.4 filament a variety of fibres characterized by extreme length, such that there are normally no filament ends within a part except at geometric discontinuities. Filaments can be formed into roving or yarn with very low twist. NOTE Fibre and filament are often interchanged. 3.5 twist the number of turns per unit length about the axis, in a yarn or other textile strand. 3.6 sizing agent/coupling agent a chemical substance applied to filaments/fibres for protection, processability and influence on mechanical and chemical properties. 3.7 fibre strand bundle of filaments (for glass fibres only) 3.8 yarn twisted strands NOTE For carbon fibre yarn can be used on filament bundle with 0 twist. 3.9 roving number of strands, tows or ends collected into a parallel bundle with little or no twist 4 Content of a declaration A declaration for the fibre material shall consist of information given in part 1 and this part of this standard (i.e. EN xxx). 5

6 5 Additional declaration requirements 5.1 General The additional requirements for fibre are given below. All declaration requirements, i.e. requirements in EN xxx-1 and this part (i.e. EN xxx-3), and application dependant requirements as agreed between manufacturer/supplier and customer, shall be declared by the manufacturer as information to the customer, and the following apply: if the property given has reference to a test standard or test method, this test standard or test method shall be used; the values given shall be in accordance with the test standard given; the tolerances shall be given. If the tolerances are stated in the test standard these apply, if not these shall be specified; the clarification of the terms nominal, minimum and maximum test values is given in Annex A; if the test environment is not clearly stated in the specific test standard, the standard atmosphere conditioning and testing shall be carried out in accordance with EN ISO 291; the manufacturer shall be responsible for the performance and results of all tests required for the declaration. 5.2 Properties of carbon fibre The additional declaration requirements for carbon fibre are listed below. The requirements shall be given in accordance with the test standards stated in Table 1 and including the tolerances. Deviations from the referred standards shall be clearly stated and explained. The following additional declaration requirements a) to n) apply for all carbon fibre independent on application: a) Fibre identification (name, number/code, used by the manufacturer for identification purposes); b) Fibre density [kg/m 3 ] (g/cm 3 ); NOTE Defines the density of the roving/yarn without sizing agent. c) Linear density [g/km (= tex)] ; NOTE Defines the linear density of the roving/yarn without sizing agent. Given as supply batch value and bobbin/roll value. d) Filament count (f); e) Filament diameter [μm]; f) Size type and identification; 1) Defines the sizing applied to the fibre with respect to type and product identification. 2) The size identification shall refer to a revision number or date of modification if number/code is the same for different versions of the size formulation. 6

7 g) Size content [wt%]; NOTE Defines the average amount of size applied to fibre. h) Fibre twist [t/m]; NOTE Defines the amount of twist. The twist refers to the twist after the roving/yarn has been taken off the bobbin/roll according to advised method. i) Strand length (not applicable if continuous) [mm]. j) Tensile strength [MPa]; NOTE Given as supply batch value. k) Tensile modulus [GPa]; NOTE Given as supply batch value. l) Tensile strain at break [%]; m) Packing/storing condition; NOTE Specifies the temperature and humidity at packaging premises n) Bobbin /spool characteristic (i.e. spool dimensions, weight). 5.3 Property of glass fibre The additional declaration requirements for glass fibre are listed below. The requirements shall be given in accordance with the test standards stated in Table 2 and Table 3 and including the tolerances. The following additional declaration requirements a) to p) apply for all glass fibre independent on application: a) Fibre identification (name/number/code used by the manufacturer for identification purposes); b) Chemical composition (see example given in Table 4); c) Density [kg/m 3 ]; d) Linear density [g/km] (= tex); NOTE Defines the linear density of the roving/yarn without sizing. Given as supply batch value and bobbin/roll/box value. e) Filament diameter [μm]; f) Size type and identification; 1) Defines the sizing applied to the fibre with respect to type and product identification. 2) The size identification shall refer to a revision number or date of modification if number/code is the same for different versions of the size formulation. g) Size content [wt%]; h) Twist [t/m]; 1) Defines the amount of twist. 7

8 2) The twist shall refer to the twist after the roving/yarn has been taken off the bobbin/roll according to advised method. i) Moisture content [wt%]; j) Strand length (not applicable for continuous fibre) [mm]; k) Tensile strength [MPa]; NOTE Given as supply batch value and bobbin value. l) Tensile modulus [GPa]; NOTE Given as supply batch value and bobbin value. m) Tensile strain at break [%]; NOTE Given as supply batch value and bobbin value. n) Thermal expansion (applicable if glass type is outside defined types according to ASTM D578) [1/ C]; o) Packing/storing condition (specifies the temperature and humidity at packaging premises); p) Bobbin /spool characteristic (i.e. spool dimensions, weight); The following additional declaration requirements q) to s) apply for glass fibre for specific application: q) Dielectric constant; 1) Applicable if glass type is outside defined types according to ASTM D578. 2) To be given at 1 MHz and 10GHz. r) Dissipation factor; 1) Applicable if glass type is outside defined types according to ASTM D578. 2) To be given at 1 MHz and 10GHz. s) Catenary [cm]. NOTE Defines the differences in length of the fibre strands, in bundle of roving. 6 Content of Certificate of Analysis (CoA) 6.1 General Certificate of analysis (CoA) shall be delivered on request. The certificate shall verify that the delivered batch is within the agreed number of declared values. The relevant test methods used to obtain batch data shall be the same as used for the declaration. Each sheet of the CoA shall be clearly marked with identification and batch number. 6.2 CoA for carbon fibre The certificate of analysis for carbon fibre, with reference to relevant items given in 5.2, is given in Table 1 for the application independent carbon fibre properties. 8

9 Ref. no 5.2 Property b) Density c) Table 1 CoA properties for application independent carbon fibre Linear density (excluding chopped strand) Declared value with tolerances (% or range) CoA Test result Unit [kg/m 3 ] (g/cm 3 ) [g/km] (= tex) Test method ISO 10119, Method A: Liquid displacement method. EN ISO 1889 d) Filament count [f] o e) Filament diameter [μm] o g) h) Size content non-cured sizing partly cured and cured sizing Twist (excluding chopped strand) [wt%] [t/m] EN ISO Method A Solvent method Method B Acid method EN ISO1890 i) Strand length [mm] o CoA Content a o o o j) Tensile strength (excluding chopped strand) [MPa] EN ISO (or test methods based on JIS R 7601 [1]) using test rate 5 mm/min to 30 mm/min k) Tensile modulus (excluding chopped strand) [GPa] EN ISO (or test methods based on JIS R 7601 [1]) using test rate 5 mm/min to 30 mm/min l) Tensile strain at break (excluding chopped strand) [%] EN ISO (or test methods based on JIS R 7601 [1]) using test rate 5 mm/min to 30 mm/min a - Compulsory o - Optional 6.3 CoA for glass fibre The certificate of analysis for glass fibre, with reference to relevant items given in 5.3, is given in Table 2 for the application independent glass fibre properties and in Table 3 for the application dependent glass fibre properties. 9

10 Table 2 CoA properties for application independent glass fibre Ref. no 5.3 Property Declared value with tolerances (% or range) CoA Test result Unit Test method CoA Content a b) Chemical composition b [%] o c) Density [kg/m 3 ] (g/cm 3 ) ISO o d) Linear density (excluding chopped strand) [g/km] (= tex) EN ISO 1889 e) Filament diameter [μm] ISO 1888 o g) Size content [wt%] ISO 1887 h) Twist [t/m] EN ISO1890 o i) Moisture content [wt%] EN ISO 3344 j) Strand length (excluding continuous fibres) [mm] o k) l) m) Tensile strength (excluding chopped strand) Tensile modulus (excluding chopped strand) Tensile strain at break (excluding chopped strand) [MPa] EN ISO 9163 [GPa] EN ISO 9163 [%] EN ISO 9163 n) Thermal Expansion [1/ C] ASTM D578 o a b - Compulsory o - Optional See Table 4 for example Table 3 CoA properties for glass fibre for specific application Ref. no 5.3 Property Declared value with tolerances (% or range) CoA Test result Unit Test method CoA Content a q) Dielectric Constant ASTM D150 o r) Dissipation Factor ASTM D150 o s) Catenary [cm] ASTM D2970 o a - Compulsory o - Optional 10

11 Table 4 Example of chemical composition for glass fibre Constituent Declared Content % Actual Content a % SiO ,3 Al 2O ,1 B 2O 3 0-0,2 0,05 CaO MgO 4-7 5,1 ZnO BaO Li 2O Na 2O+K 2O 0-0,5 0,001 TiO 2 ZrO 2 Fe 2O 3 0-0,1 0,02 F 2 0-0,1 0,05 Other a Applicable if CoA 11

12 Annex A (informative) Clarification of nominal, maximum and minimum test values A.1 General The requested properties as given in this part of the standard EN xxx (i.e. EN xxxx-y), are given as nominal values with upper and lower limits, maximum values and/or minimum values. The purpose of this annex is to clarify the nomenclature and the associated values. A.2 Clarification of nominal value Nominal value means that the properties of the material will have a mean value equal to the declared value. The mean value is based on all measured values of all batches of the manufacturer. The material delivered to the customer is normally only a fraction of the totally produced material. This may result in that the actual value on the property of the delivered material has a mean value lower or higher than the declared value. However, the mean value of the property of the delivered material shall not be outside the declared tolerance limits in order to be delivered according to the declared properties. These tolerances include inaccuracy in the measurement itself. A.3 Clarification of minimum and maximum value Minimum value and maximum value means the mean value minus (-) and plus (+) two standard deviations, respectively. The minimum and maximum value is based on all measured values of all batches of the manufacturer. The delivered materials have a 97,6 % probability of being within the minimum and maximum values, thus having 2,4 % probability of being outside the minimum and maximum value. This implies that part of or all of the delivered material may belong to the fraction which is outside the minimum and maximum values. In order to avoid this, an agreement between the manufacturer and customer stating that no material shall have properties above or below the declared minimum and maximum values, i.e guaranteed minimum or maximum values. A.4 Guaranteed minimum and maximum value Guaranteed minimum and maximum value mean that no delivered material has properties below or above these values. When destructive testing is needed the mean value of the tested material (within the same batch) shall be within the declared minimum and maximum value for that particular test if guaranteed values have been agreed. In case a guaranteed value is not agreed, a sample test may have any value and still be within the specified range. A.5 Extent of testing The extent of testing involved for a CoA has to be agreed between the supplier and the customer. For a resin material it is normal to obtain the properties from the batch. For core and fibre material, several of the tests are destructive tests and have to be performed on undelivered material. 12

13 For core plates, destructive testing for mechanical properties can be performed in the lower range of density, while non destructive tests, (dimensions and density) may be performed on every plate or a selection. The extent of testing of fibre material is similar as for core material, where typical values are obtained from one or more bobbins or an agreed selection. 13

14 Bibliography [1] JIS R 7601, Testing methods for carbon fibers 14