SIST EN 14909:2006
(Main)Flexible sheets for waterproofing - Plastic and rubber damp proof courses - Definitions and characteristics
Flexible sheets for waterproofing - Plastic and rubber damp proof courses - Definitions and characteristics
This European Standard specifies the characteristics of flexible sheets of plastics and rubber intended for use as damp proof courses for buildings. It specifies the requirements and test methods and provides for the evaluation of conformity of the products with the requirements of this European Standard.
This European Standard does not cover related products such as preformed cavity trays, coping and flashings.
Abdichtungsbahnen - Kunststoff- und Elastomer-Mauersperrbahnen - Definitionen und Eigenschaften
Diese Europäische Norm legt die Eigenschaften von Abdichtungsbahnen aus Kunststoffen und Elastomeren fest, die als Mauersperrbahnen zur Abdichtung von Bauwerken dienen. Sie enthält die Anforderungen und Prüfverfahren und ermöglicht die Konformitätsbewertung der Produkte nach den Anforderungen dieser Europäischen Norm.
Diese Europäische Norm beinhaltet keine verwandten Produkte, wie vorgefertigte Hohlraumwannen, Mauerkronen und Abdeckungen.
Feuilles souples d'étanchéité - Feuilles plastiques et élastomeres utilisées dans les murs contre les remontées d'humidité - Définitions et caractéristiques
La présente Norme européenne spécifie les caractéristiques des feuilles souples plastiques et élastomeres
destinées a etre utilisées dans les murs de bâtiments contre les remontées capillaires. Elle précise les
exigences et les méthodes d'essais et spécifie un systeme d'attestation de conformité de ces produits a cette
Norme européenne.
La présente Norme ne porte pas sur des produits connexes tels que les feuilles gaufrées, plaques de
couronnement et bandes solins préformés.
Hidroizolacijski trakovi – Polimerni in elastomerni trakovi za tesnjenje – Definicije in lastnosti
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Flexible sheets for waterproofing - Plastic and rubber damp proof courses - Definitions and characteristicsHidroizolacijski trakovi – Polimerni in elastomerni trakovi za tesnjenje – Definicije in lastnostiFeuilles souples d'étanchéité - Feuilles plastiques et élastomeres utilisées dans les murs contre les remontées d'humidité - Définitions et caractéristiquesAbdichtungsbahnen - Kunststoff- und Elastomer-Mauersperrbahnen - Definitionen und EigenschaftenTa slovenski standard je istoveten z:EN 14909:2006SIST EN 14909:2006en91.100.5001.040.91ICS:SLOVENSKI
STANDARDSIST EN 14909:200601-september-2006
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14909April 2006ICS 01.040.91; 91.100.50 English VersionFlexible sheets for waterproofing - Plastic and rubber dampproof courses - Definitions and characteristicsFeuilles souples d'étanchéité - Feuilles plastiques etélastomères utilisées dans les murs contre les remontéesd'humidité - Définitions et caractéristiquesAbdichtungsbahnen - Kunststoff- und Elastomer-Mauersperrbahnen - Definitionen und EigenschaftenThis European Standard was approved by CEN on 2 March 2006.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 Central Secretariat 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 Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2006 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14909:2006: E
EN 14909:2006 (E) 2 Contents Page Foreword.3 1 Scope.5 2 Normative references.5 3 Terms and definitions.6 4 Product designation.7 5 Product characteristics.7 6 Evaluation of conformity.9 7 Product data sheet.12 8 Marking, labelling and packaging.12 Annex A (informative)
Product designation code.13 Annex B (normative)
Method of testing the resistance of flexible ventilating damp proof membranes to deformation under load.14 Annex C (normative)
Method of testing for the accelerated ageing of damp proof sheets in an alkaline environment.18 Annex D (informative)
Example of product data sheet.20 Annex ZA (informative)
Clauses of this European Standard addressing the provisions of the EU Construction Products Directive.22 Bibliography.29
EN 14909:2006 (E) 3 Foreword This European Standard (EN 14909:2006) has been prepared by Technical Committee CEN/TC 254 “Flexible sheets for waterproofing”, the secretariat of which is held by BSI. 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 October 2006, and conflicting national standards shall be withdrawn at the latest by October 2006.
This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this European Standard. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EN 14909:2006 (E) 4 Introduction The purpose of damp proof courses is to prevent water rising up a wall from the ground, water moving from one part of a wall to another and to deflect water from an inner wall of a cavity wall construction to the exterior of the building. Damp proof courses may also be used in masonry chimneys and parapet walls to protect the inside of the building from water moving down from above. They should be designed in conjunction with flashings and sheets for waterproofing, including roofing sheets and damp proof sheets, to ensure a continuous barrier and should deflect water to the exterior of a building so that it can drain away safely.
EN 14909:2006 (E) 5
1 Scope This European Standard specifies the characteristics of flexible sheets of plastics and rubber intended for use as damp proof courses for buildings. It specifies the requirements and test methods and provides for the evaluation of conformity of the products with the requirements of this European Standard. This European Standard does not cover related products such as preformed cavity trays, coping and flashings. 2 Normative references The following referenced documents are indispensable for the application of this European Standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 495-5, Flexible sheets for waterproofing - Determination of foldability at low temperature - Part 5: Plastic and rubber sheets for roof waterproofing EN 1296, Flexible sheets for waterproofing - Bitumen, plastic and rubber sheets for roofing - Method of artificial ageing by long term exposure to elevated temperature EN 1848-2, Flexible sheets for waterproofing - Determination of length, width, straightness and flatness - Part 2: Plastic and rubber sheets for roof waterproofing EN 1849-2, Flexible sheets for waterproofing - Determination of thickness and mass per unit area - Part 2: Plastic and rubber sheets for roof waterproofing EN 1850-2, Flexible sheets for waterproofing - Determination of visible defects - Part 2: Plastic and rubber sheets for roof waterproofing EN 1928, Flexible sheets for waterproofing - Bitumen, plastic and rubber sheets for roof waterproofing - Determination of watertightness EN 1931, Flexible sheets for waterproofing - Bitumen, plastic and rubber sheets for roof waterproofing - Determination of water vapour transmission properties EN 12310-1, Flexible sheets for waterproofing - Part 1: Bitumen sheets for waterproofing - Determination of resistance to tearing (nail shank) EN 12311-2, Flexible sheets for waterproofing - Determination of tensile properties - Part 2: Plastic and rubber sheets for roof waterproofing EN 12317-2, Flexible sheets for waterproofing - Determination of the shear resistance of joints - Part 2: Plastic and rubber sheets for roof waterproofing EN 12691, Flexible sheets for waterproofing - Bitumen, plastic and rubber sheets for roof waterproofing - Determination of resistance to impact EN 12730, Flexible sheets for waterproofing - Bitumen and rubber sheets for roof waterproofing - Determination of resistance to static loading EN 13416:2001, Flexible sheets for waterproofing - Bitumen, plastic and rubber sheets for roof waterproofing - Rules for sampling
EN 14909:2006 (E) 6 EN 13501-1:2002, Fire classification of construction products and building elements - Part 1: Classification using test data from reaction to fire tests EN ISO 11925-2, Reaction to fire tests - Ignitability of building products when subjected to direct impingement of flame - Part 2: Single-flame source test (ISO 11925-2:2002) 3 Terms and definitions For the purposes of this European Standard, the terms and definitions given in EN 13416:2001 and the following apply. 3.1 waterproofing action to prevent the passage of water from one plane to another 3.2 plastics and rubber damp proof course flexible sheets of plastics or rubbers or composites based on these materials whose function is to prevent liquid water passing from one part of the wall to another (see Introduction). In composite sheets the plastic or rubber is the functional component 3.3 ventilating or draining damp proof course flexible sheets conforming to the definition in 3.2 but with the ability to provide a continuous void or structure to allow free movement of water vapour or liquid water between the underside of the damp proof course and any further construction 3.4 manufacturer's limiting value MLV value stated by the manufacturer to be met during testing. The manufacturer's limiting value can be a minimum or a maximum value according to statements made under product characteristics of this standard 3.5 manufacturer's declared value MDV value declared by the manufacturer accompanied by a declared tolerance 3.6 plastic or rubber sheet factory-made flexible membrane made from a plastic or rubber which may include composites with other materials 3.7 sampling procedure used to select or constitute a sample 3.8 sample sheet from which a test piece is taken 3.9 test piece part of the sample from which test specimens are taken 3.10 test specimen piece of precise dimensions taken from the test piece
EN 14909:2006 (E) 7 4 Product designation The types of damp proof sheets covered by this European Standard are designated as follows: TYPE A damp proof course; TYPE V damp proof course – ventilating or draining. 5 Product characteristics 5.1 General 5.1.1 Where a tolerance is limited by this European Standard it does not have to be declared by the manufacturer. 5.1.2 When tested for purposes other than initial type testing or factory production control, the tests to determine product characteristics indicated in this standard shall be started within one month of delivery of the product from the manufacturer. 5.2 Deviation from test sample dimensions Where the contours of the product make it impossible to obtain a test sample of the required dimensions, or otherwise render the test impracticable, testing may be carried out either on samples of different dimensions or if still impracticable on the equivalent flat sheet of the same thickness as the finished product. Any such deviations from the test method shall be recorded on the test report and the product data sheet. 5.3 Visible defects The product shall be free of visible defects determined in accordance with EN 1850-2. 5.4 Dimensions and tolerances The length, width and straightness shall be determined in accordance with EN 1848-2. The length and width shall lie within the declared tolerance of the manufacturer's declared value. The maximum deviation from straightness shall not exceed 75 mm per 10 m length or in proportion for other lengths (e.g. 37,5 mm per 5 m length). 5.5 Thickness and mass per unit area The thickness and mass per unit area shall be determined in accordance with EN 1849-2. Where a product is specified by mass per unit area, the mass shall lie within the declared tolerance of the manufacturer's declared value. Where it is not practicable to obtain a sample (see 5.2), a larger sample area shall be used and the deviation from the test method noted. Where a product is specified by thickness, the thickness shall lie within the declared tolerance of the manufacturer's declared value. No single measurement shall lie outside the declared tolerance of the manufacturer's declared value. 5.6 Watertightness The product shall be watertight as determined by EN 1928 Method A with a pressure of 2 kPa and shall give a pass result.
EN 14909:2006 (E) 8 5.7 Resistance to impact The resistance to impact shall be evaluated when subject to regulatory requirements, and may be evaluated when not subject to such requirements. It shall be determined in accordance with EN 12691 and shall be greater than or equal to the manufacturer's limiting value. 5.8 Durability 5.8.1 Against ageing/degradation In order to verify the artificial ageing behaviour of the product, watertightness shall be determined after exposure in accordance with EN 1296 for a period of 12 weeks. The watertightness shall be determined in accordance with EN 1928 Method A at a pressure of 2 kPa and shall give a pass result. 5.8.2 Against alkali The durability against alkali shall be evaluated when subject to regulatory requirements, and may be evaluated when not subject to such requirements. It shall be determined in accordance with Annex C. The elongation shall be determined in accordance with EN 12311-2 and the value after ageing shall be not less than 50 % of the initial elongation. 5.9 Resistance to low temperature The resistance to folding at low temperature shall be evaluated when subject to regulatory requirements, and may be evaluated when not subject to such requirements. It shall be determined in accordance with EN 495-5 and shall be less than or equal to the manufacturer’s limiting value. 5.10 Resistance to tearing (nail shank) Where required, the tear resistance (nail shank) shall be determined in accordance with EN 12310-1 and shall lie within the declared tolerance of the manufacturer's declared value. 5.11 Joint strength Joint strength shall be evaluated when subject to regulatory requirements, and may be evaluated when not subject to such requirements. It shall be determined in accordance with EN 12317-2 and shall greater than or equal to the manufacturer's limiting value. 5.12 Water vapour transmission properties Where required, water vapour transmission properties shall be determined in accordance with EN 1931 and shall lie within the declared tolerance of the manufacturer's declared value. 5.13 Resistance to static loading The resistance to static loading shall be determined in accordance with EN 12730 and the results of the test shall be greater than or equal to the manufacturer’s limiting value. 5.14 Resistance to deformation under load for type V The resistance of type V damp proof courses to deformation under load shall be determined in accordance with Annex B and the results shall be less than or equal to the manufacturer's limiting value of deformation at the defined load and the defined time.
EN 14909:2006 (E) 9 5.15 Reaction to fire Reaction to fire shall be evaluated when subject to regulatory requirements, and may be evaluated when not subject to such requirements. It shall be tested and classified in accordance with EN 13501-1:2002, Table 1. When tested according to EN ISO 11925-2, the products shall be tested under conditions of surface flame attack. NOTE It is currently considered that the Euroclasses Classification system at Classes D and above requires investigation to determine its appropriateness to the products covered by this European Standard (the SBI test may be inappropriate for products covered by the standard). Pending results of such an investigation and discussions in the Fire Regulators Group, products covered by this European Standard are tested to EN ISO 11925-2. If and when a new fire test scenario and test method are developed for the products, this European Standard will be amended to refer to them. 5.16 Dangerous substances For products placed on the market within the European Economic Area see ZA.1. Outside the EEA products shall conform to any applicable provisions related to regulated dangerous substances valid in the place of use. 6 Evaluation of conformity 6.1 General The compliance of the product with the requirements of this European Standard and with the stated values (including classes) shall be demonstrated by: initial type testing, factory production control by the manufacturer, including product assessment. For the purposes of testing, products may be grouped into families, where it is considered that the results for a given characteristic from any one product within the family are representative for all other products within that family. 6.2 Initial type testing 6.2.1 General Initial type testing shall be performed to show conformity with this European Standard. Tests previously performed in accordance with the provisions of this European Standard (same product, same characteristic(s), test method, sampling procedure, system of attestation of conformity etc.) may be taken into account. In addition, initial type testing shall be performed at the beginning of the production of a new product type (unless a member of the same family) or at the beginning of a new method of production (where this may affect the stated properties). All characteristics in Clause 5 shall be subject to initial type testing, where required, see Table 1. Whenever a change occurs in the product design, the raw material or supplier of the components, or the production process (subject to the definition of a family), which would change significantly one or more of the characteristics, the type tests shall be repeated for the appropriate characteristic(s). The results of all initial type tests shall be held by the manufacturer for a period of at least ten years after the date of last production of the products to which they relate.
EN 14909:2006 (E) 10 Table 1 — Compliance criteria for initial type testing Property Parameter Test method Clause in this European Standard Compliance criteria (where required) Visible defects Visible defects EN 1850-2 5.3 No visible defects Length Manufacturer's declared value EN 1848-2 5.4 Within the declared tolerance of the MDV Width Manufacturer's declared value EN 1848-2 5.4 Within the declared tolerance of the MDV Straightness 75 mm/10 m EN 1848-2 5.4 Pass Thickness Manufacturer's declared value EN 1849-2 5.5 Within the declared tolerance of the MDV Mass Manufacturer's declared value EN 1849-2 5.5 Within the declared tolerance of the MDV Watertightness Watertight at 2 kPa EN 1928 5.6 Pass Resistance to impact Manufacturer's limiting value EN 12691 5.7 Greater than or equal to MLV Durability (artificial ageing) Watertight at 2 kPa EN 1296 test afterwards to EN 1928 5.8.1 Pass Durability (alkali) Elongation ≥ 50 % of initial value Annex C 5.8.2 Pass Resistance to low temperature Manufacturer's limiting value EN 495-5 5.9 Less than or equal to MLV Resistance to tearing (nail shank) Manufacturer's declared value EN 12310-1 5.10 Within the declared tolerance of the MDV Joint strength Manufacturer's limiting value EN 12317-2 5.11 Greater than or equal to MLV Water vapour transmission properties Manufacturer's declared value EN 1931 5.12 Within the declared tolerance of the MDV Resistance to static loading Manufacturer's limiting value EN 12730 5.13 Greater than or equal to MLV Resistance to deformation under load for type V Manufacturer's limiting value Annex B 5.14 Greater than or equal to MLV Reaction to fire Euroclass EN 13501-1 5.15 Classification fulfilled
6.2.2 Sampling Samples shall be taken according to EN 13416. The minimum number of tests to show compliance for initial type testing shall be one for all characteristics, unless a given test method specifies otherwise. 6.3 Factory production control (FPC) 6.3.1 General The manufacturer shall establish, document and maintain an FPC system to ensure that the products placed on the market conform to the stated performance characteristics. The FPC system shall consist of procedures, regular inspections and tests and/or assessments and the use of the results to control raw and other incoming materials or components, equipment, the production process and the product. If a manufacturer claims compliance with FPC requirements by operating an EN ISO 9001 system,
EN ISO 9001 shall be applied in full and shall be made specific to the requirements of this European Standard.
EN 14909:2006 (E) 11 The results of inspections, tests or assessments requiring action shall be recorded, as shall any action taken. The action to be taken when control values or criteria are not met shall be recorded. 6.3.2 Frequency of testing The minimum frequencies of testing for factory production control are given in Table 2. All other relevant characteristics shall be controlled indirectly (e.g. by control of product composition). Table 2 — Frequencies of testing for FPC Minimum frequencies of testing per
batch week month year 5.3 Visible defects 1
5.4 Length 1
5.4 Width 1
5.4 Straightness
1
5.5 Thickness and mass per unit area 1
5.10 Tear resistance a
1
a Only where declared.
EN 14909:2006 (E) 12 7 Product data sheet The characteristics of the product, determined in accordance with the test methods specified in this European Standard, shall be listed in a technical data sheet, an example of which is shown in Annex D. The technical data sheet shall give at least the following information: a) product trade name and manufacturer's name; b) origin/source of manufacture or traceable code; c) method of application; d) results from the tests in Table 1, as appropriate for the intended end use; e) certification mark, if any; f) consumer information, e.g. restrictions concerning use and storage and safety precautions during installation and disposal; g) description of the product (e.g. type and number of carriers, type of coating, mass or thickness, type of surfacing). 8 Marking, labelling and packaging The following information shall be indicated on each roll or at least on each consignment: a) production date or identification number; b) product trade name; c) type of product (Type A or Type V); d) length and width; e) thickness or mass. f) labelling according to national regulations related to dangerous substances and/or health and safety. Where ZA.3 covers the same information as required by this clause, the requirements of this clause are met.
EN 14909:2006 (E) 13 Annex A (informative)
Product designation code THERMOPLASTICS EEA – Ethylene / ethyl acrylate EVAC – Ethylene / vinyl acetate ECB – Ethylene, copolymer, bitumen EBT – Ethylene – Bitumen – Thermoplastic PE – Polyethylene CPE – Chlorinated polyethylene PP – Polypropylene PIB – Polyisobutylene PVC – Polyvinyl chloride TPO – Thermoplastic polyolefine VET – Vinyl ethylene terpolymer FPO or PO-F– Flexible Polyolefins
THERMOPLASTICS – ELASTOMERS CSM – Chlorosulfonated polyethylene
ELASTOMERS BR – Butadiene rubber CR – Chloroprene rubber EPDM – Terpolymer of ethylene, propylene and diene with a residual un-separated portion of the polymerised diene in the side chain IIR – Isobutene-isoprene rubber (butyl rubber) NBR – Acrylonitrile-butadiene rubber (nitrile rubber) POE – Polyolefin elastomer
EN 14909:2006 (E) 14 Annex B (normative)
Method of testing the resistance of flexible ventilating damp proof membranes to deformation under load B.1 Principle This is a method for the determination of the resistance of ventilating or draining thermoplastic damp proof sheets and water vapour control products to deformation under load. The method is intended for the initial testing and/or for quality control purposes. The purpose of the test is to determine the resistance to deformation under load of flexible profiled (non-flat) sheets for damp protection which in addition provide ventilation or drainage to deformation under load. A conditioned test specimen is placed under a fixed load. Deformation is recorded as a function of time. The test is suitable for products, other than flat sheets, which experience plastic creep, i.e. the test measures the ability of the products to retain their shape under a long term fixed load. A suitable fixed load is defined as the required design load, plus a factor of safety. The time period for testing is determined by assessment of the development of deformation with time in relation to both acceptable degree of deformation and expected life of product. The deformation against time is illustrated in Figures B.1 and B.2. Extrapolation shall not exceed one unit of logarithmic time and the extrapolated part of the data shall be clearly indicated by a dotted line. tD10987650510152025303540XXXXXXXXXXXX
Key D deformation % t time h Figure B.1 — Typical curve for deformation against time
EN 14909:2006 (E) 15 Dt141210860.010.11101001 00010 000100 0001 000 000
1
2
3XXXXXXXXXXXX Key D deformation % t time h NOTE 1 = 1 year, 2 = 10 years, 3 = 50 years Figure B.2 — Typical logarithmic plot against time to determine deformation for design life B.2 Apparatus The specimen is placed between parallel rigid compression plates which distribute the load uniformly over the area of the specimen. Load may be applied by the use of physical weights or an alternative comparable method. Deformation is registered as a function of time. Preloading of the specimen prior to zeroing of deformation instrumentation may be applied to suit the product to be tested. Zeroing of the deformation instrumentation shall be arranged such that any deformation prior to zeroing is either eliminated or negligible. Deformation is preferably measured direct on the pressure plate, or as close to the specimen as is practically possible, so that deformation errors in the apparatus are eliminated. Measuring instruments for deformation shall have a minimum accuracy of ± 0,02 mm. All measurements shall be recorded to the nearest 0,01 mm. NOTE A typical test apparatus using physical weights is shown in Figure B.3.
EN 14909:2006 (E) 16 123456 Key 1 weights 2 measuring gauge 3 support frame 4 base plate 5 specimen 6 pressure plate Figure B.3 — Typical test apparatus using physical weights B.3 Preparation of test samples and test specimens B.3.1 Sampling Samples shall be taken in accordance with EN 13416. B.3.2 Preparation of test specimens Square or rectangular specimens of minimum dimension 120 mm shall be used, so that test results are representative for design loads and required performance of the product being tested. NOTE Specimen minimum size may be confirmed as a function of profile height by type testing, so as to eliminate the effect of less resistance against load along the edge of the specimen. Condition the test specimens for at least 24 h at (23 ± 2) °C.
EN 14909:2006 (E) 17 B.4 Procedure If results are to be presented as a percentage, measure the height of the product in at least four different positions prior to commencement of loading. Determine the mean value for the specimen. Measure the size of the specimen. Carry out testing at a temperature of (23 ± 2) °C. Place the specimen between the compression plates, apply preload where appropriate, and zero the deformation instrumentation. Apply the load as smoothly and as quickly as possible. Subject the specimen to a constant static load over a period of time at (23 ± 2) °C and a humidity of (50 ± 20) % RH. If humidity has no influence on the property being examined, the relative humidity may be uncontrolled. Measure deformation in millimetres as a function of time. NOTE Generally, the greatest deformation takes place initially, and measurements are made at short time intervals. As increase in deformation reduces with time, the time intervals between measurements of deformation may be increased as the test progresses. See Figures B.1 and B.2. B.5 Expression of results Express deformation in millimetres or percentage of original product height for the given constant static load for the stated time. Express constant static load in kN/m2, calculated from the given test load in relation to specimen size. NOTE For initial type testing a graph of deformation against time may be plotted. See Figures B.1 and B.2. B.6 Test report The test report shall include at least the following information: a) details of the plastic material; b) reference to this test method; c) test conditions (temperature, time); d) special observations such as discoloration or deformations; e) quantity of tested samples; f) any deviations from this method; g) test result: value of constant static load; specime
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