Thermal insulation products for buildings - Factory made products of expanded polystyrene (EPS) - Specification

This European Standard specifies the requirements for factory made products of expanded polystyrene, with or without facings or coatings, which are used for the thermal insulation of buildings. The products are manufactured in the form of boards or rolls or other preformed ware.
This European Standard describes product characteristics and includes procedures for testing, evaluation of conformity, marking and labelling.
Products covered by this European Standard are also used for sound insulation and in prefabricated thermal insulation systems and composite panels; the performance of systems incorporating these products is not covered.
This European Standard does not specify the required class or level of a given property to be achieved by a product to demonstrate fitness for purpose in a particular application. The classes and levels required for a given application are to be found in regulations or non conflicting standards.
Products with a declared thermal resistance lower than 0,25 m2K/W or a declared thermal conductivity at 10 °C greater than 0,060 W/(m•K) are not covered by this European Standard.

Wärmedämmstoffe für Gebäude - Werkmäßig hergestellte Produkte aus expandiertem Polystyrol (EPS) - Spezifikation

Diese Europäische Norm legt die Anforderungen für werkmäßig hergestellte Produkte aus EPS mit oder ohne
Kaschierung fest, die für die Wärmedämmung von Gebäuden benutzt werden. Die Produkte werden in der
Form von Platten oder Rollen oder anderer vorgeformter Ware hergestellt.
Diese Europäische Norm beschreibt die Stoffeigenschaften und enthält die Prüfverfahren und Festlegungen
für die Konformitätsbewertung, die Kennzeichnung und die Etikettierung.
Die in dieser Europäischen Norm beschriebenen Produkte werden auch für die Schalldämmung und in
vorgefertigten Wärmedämmsystemen und Mehrschicht-Verbundplatten angewendet; die Eigenschaften von
Systemen mit diesen Produkten werden nicht behandelt.
Diese Europäische Norm legt keine Anforderungsniveaus für eine vorgegebene Eigenschaft fest, die ein
Produkt erreichen muss, um für einen bestimmten Anwendungsfall tauglich zu sein. Für bestimmte
Anwendungen benötigte Klassen und Stufen können Regelwerken oder übereinstimmenden Normen
entnommen werden.
Diese Europäische Norm gilt nicht für Produkte, deren Nennwert des Wärmedurchlasswiderstandes niedriger
ist als 0,25 m2 ⋅ K/W oder deren Nennwert der Wärmeleitfähigkeit bei 10 °C Mitteltemperatur größer ist als
0,060 W/(m ⋅ K).

Produits isolants thermiques pour le bâtiment - Produits manufacturés en polystyrène expansé (EPS) - Spécification

La présente Norme européenne spécifie les exigences auxquelles doivent satisfaire les produits manufacturés en polystyrène expansé, avec ou sans parements ou revêtements, utilisés pour l'isolation thermique des bâtiments. Les produits sont fabriqués sous forme de panneaux ou de rouleaux ou toute autre présentation préformée.
La présente norme européenne décrit les caractéristiques du produit et contient les procédures d’essai, d’évaluation de la conformité, de marquage et d’étiquetage.
Les produits relevant du domaine d'application de la présente norme européenne sont également utilisés pour l’isolation acoustique dans des systèmes d'isolation thermique et des panneaux composites préfabriqués ; la performance des systèmes dans lesquels entrent ces produits n'est pas définie.
La présente norme européenne ne spécifie pas, pour une propriété donnée, le niveau exigé que doit atteindre un produit pour démontrer son aptitude à l’emploi dans une application particulière. Les classes et niveaux requis pour une application donnée figurent dans les réglementations ou normes non conflictuelles.
Les produits dont la résistance thermique déclarée à une température de 10 °C est inférieure à 0,25 m2.K/W ou dont la conductivité thermique déclarée à une température de 10°C est supérieure à 0,060 W/(m.K) ne sont pas du domaine d'application de la présente norme européenne.

Toplotnoizolacijski proizvodi za stavbe - Proizvodi iz ekspandiranega polistirena (EPS) - Specifikacija

General Information

Status
Withdrawn
Public Enquiry End Date
30-Jul-2008
Publication Date
13-Jan-2009
Withdrawal Date
15-Jan-2013
Technical Committee
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
18-Dec-2012
Due Date
10-Jan-2013
Completion Date
16-Jan-2013

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Toplotnoizolacijski proizvodi za stavbe - Proizvodi iz ekspandiranega polistirena (EPS) - SpecifikacijaWärmedämmstoffe für Gebäude - Werkmäßig hergestellte Produkte aus expandiertem Polystyrol (EPS) - SpezifikationProduits isolants thermiques pour le bâtiment - Produits manufacturés en polystyrène expansé (EPS) - SpécificationThermal insulation products for buildings - Factory made products of expanded polystyrene (EPS) - Specification91.100.60Thermal and sound insulating materialsICS:Ta slovenski standard je istoveten z:EN 13163:2008SIST EN 13163:2009en,de01-februar-2009SIST EN 13163:2009SLOVENSKI
STANDARDSIST EN 13163:2002/AC:2006SIST EN 13163:20021DGRPHãþD



SIST EN 13163:2009



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 13163November 2008ICS 91.100.60Supersedes EN 13163:2001
English VersionThermal insulation products for buildings - Factory madeproducts of expanded polystyrene (EPS) - SpecificationProduits isolants thermiques pour le bâtiment - Produitsmanufacturés en polystyrène expansé (EPS) - SpécificationWärmedämmstoffe für Gebäude - Werkmäßig hergestellteProdukte aus expandiertem Polystyrol (EPS) - SpezifikationThis European Standard was approved by CEN on 12 October 2008.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 CEN 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 CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, 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© 2008 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 13163:2008: ESIST EN 13163:2009



EN 13163:2008 (E) 2 Contents Page Foreword .4 1 Scope .6 2 Normative references .6 3 Terms, definitions, symbols, units and abbreviated terms .8 3.1 Terms and definitions .8 3.2 Symbols, units and abbreviated terms .8 4 Requirements . 11 4.1 General . 11 4.2 For all applications . 11 4.3 For specific applications . 14 5 Test methods . 21 5.1 Sampling . 21 5.2 Conditioning . 21 5.3 Testing . 21 6 Designation Code . 23 7 Evaluation of conformity . 24 8 Marking and labelling . 24 Annex A (normative)
Determination of the declared values of thermal resistance and thermal conductivity . 25 A.1 General . 25 A.2 Input data . 25 A.3 Declared values. 25 Annex B (normative)
Factory production control . 27 B.1 Testing frequencies . 27 B.2 Indirect testing . 31 Annex C (normative)
Product classification . 35 Annex D (informative)
Additional properties . 36 D.1 General . 36 D.2 Long-term compressive behaviour . 36 D.3 Shear behaviour . 36 D.4 Water vapour diffusion resistance factor . 37 D.5 Behaviour under cyclic loading . 38 D.6 Test methods . 38 D.7 Additional information . 39 Annex ZA (informative)
Clauses of this European standard addressing the provisions of the EU Construction Products Directive. 40 ZA.1 Scope and relevant characteristics . 40 ZA.2 Procedures for attestation of conformity of factory made expanded polystyrene products . 42 ZA.3 CE Marking and labelling . 46 Bibliography . 48
SIST EN 13163:2009



EN 13163:2008 (E) 3 Tables Table 1 — Classes of dimensional tolerances . 13 Table 2 — Classes of dimensional stability under constant normal laboratory conditions . 13 Table 3 — Levels of dimensional stability under specified temperature and humidity conditions . 14 Table 4 — Levels of deformation under specified compressive load and temperature conditions . 15 Table 5 — Levels for compressive stress at 10 % deformation . 16 Table 6 — Levels for tensile strength perpendicular to faces . 16 Table 7 — Levels of bending strength . 17 Table 8 — Levels for long term water absorption by total immersion . 18 Table 9 — Levels for long term water absorption by diffusion . 18 Table 10 — Levels for dynamic stiffness . 19 Table 11 — Classes for thickness tolerances . 20 Table 12 — Levels for compressibility . 20 Table 13 — Test methods, test specimens and conditions . 22 Table A.1 — Values for k for one sided 90 % tolerance interval with a confidence level of 90 % . 26 Table B.1 — Minimum product testing frequencies. 27 Table B.2 — Minimum product testing frequencies for the reaction to fire characteristics . 29 Table B.3 — Thickness effect parameter, L, for the determination of the declared
thermal conductivity, λD . 33 Table C.1 — Classification of EPS products . 35 Table C.2 — Classification of load bearing EPS products with acoustical properties . 35 Table D.1 — Correlation between bending strength and shear strength . 37 Table D.2 — Tabulated values of water vapour diffusion resistance index and
water vapour permeability . 38 Table D.3 — Test methods . 38 Table ZA.1 — Relevant clauses for Expanded polystyrene and intended use . 41 Table ZA.2 — Systems of attestation of conformity . 42 Table ZA.3 — Assignment of evaluation of conformity tasks for products under system 1 . 43 Table ZA.4 — Assignment of evaluation of conformity tasks for products under system 3 or system 3 combined with system 4 for reaction to fire . 44
Figures Figure B.1 — Relationship between compressive stress at 10 % deformation and apparent density for indirect testing; 1 – αααα = 0,90; n = 495 . 31 Figure B.2 — Relationship between thermal conductivity (at 50 mm reference thickness and 10 °C mean temperature) apparent density for indirect testing; 1 – αααα = 0,90; n = 3 873 . 32 Figure ZA.1 – Example CE marking information . 47
SIST EN 13163:2009



EN 13163:2008 (E) 4 Foreword This document (EN 13163:2008) has been prepared by Technical Committee CEN/TC 88 “Thermal insulating materials and products”, the secretariat of which is held by DIN. 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 May 2009, and conflicting national standards shall be withdrawn at the latest by May 2009. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EC Directive(s). For relationship with EC Directive(s), see informative Annex ZA, which is an integral part of this document. 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 EN 13163:2001.
This document is one of a series of standards for insulation products used in buildings, but this standard may be used in other areas where appropriate. In pursuance of Resolution BT 20/1993 revised, CEN/TC 88 have proposed defining the standards listed below as a European package of standards. The package of standards comprises the following group of interrelated standards for the specifications of factory made thermal insulation products, all of which come within the scope of CEN/TC 88: EN 13162, Thermal insulation products for buildings — Factory made mineral wool (MW) products — Specification EN 13163, Thermal insulation products for buildings — Factory made products of expanded polystyrene (EPS) — Specification EN 13164, Thermal insulation products for buildings — Factory made products of extruded polystyrene foam (XPS) — Specification EN 13165, Thermal insulation products for buildings — Factory made rigid polyurethane foam (PUR) products — Specification EN 13166, Thermal insulation products for buildings — Factory made products of phenolic foam (PF) — Specification EN 13167, Thermal insulation products for buildings — Factory made cellular glass (CG) products — Specification EN 13168, Thermal insulation products for buildings — Factory made wood wool (WW) products — Specification EN 13169, Thermal insulation products for buildings — Factory made products of expanded perlite (EPB) — Specification EN 13170, Thermal insulation products for buildings — Factory made products of expanded cork (ICB) — Specification SIST EN 13163:2009



EN 13163:2008 (E) 5 EN 13171, Thermal insulation products for buildings — Factory made wood fibre (WF) products — Specification 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, 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 the United Kingdom. SIST EN 13163:2009



EN 13163:2008 (E) 6 1 Scope This European Standard specifies the requirements for factory made products of expanded polystyrene, with or without facings or coatings, which are used for the thermal insulation of buildings. The products are manufactured in the form of boards or rolls or other preformed ware. This European Standard specifies product characteristics and includes procedures for testing, evaluation of conformity, marking and labelling. Products covered by this European Standard are also used for sound insulation and in prefabricated thermal insulation systems and composite panels; the performance of systems incorporating these products is not covered. This European Standard does not specify the required class or level of a given property to be achieved by a product to demonstrate fitness for purpose in a particular application. The classes and levels required for a given application are to be found in regulations or non-conflicting standards. Products with a declared thermal resistance lower than 0,25 m2⋅K/W or a declared thermal conductivity at 10 °C greater than 0,060 W/(m·K) are not covered by this European Standard. 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 822, Thermal insulating products for building applications — Determination of length and width EN 823, Thermal insulating products for building applications — Determination of thickness EN 824, Thermal insulating products for building applications — Determination of squareness EN 825, Thermal insulating products for building applications — Determination of flatness EN 826, Thermal insulating products for building applications — Determination of compression behaviour EN 1602, Thermal insulating products for building applications — Determination of apparent density EN 1603, Thermal insulating products for building applications — Determination of dimensional stability under constant normal laboratory conditions (23 °C/50 % relative humidity) EN 1604, Thermal insulating products for building applications — Determination of dimensional stability under specified temperature and humidity conditions EN 1605, Thermal insulating products for building applications — Determination of deformation under specified compressive load and temperature conditions EN 1606, Thermal insulating products for building applications — Determination of compressive creep EN 1607, Thermal insulating products for building applications — Determination of tensile strength perpendicular to faces EN 12085, Thermal insulating products for building applications — Determination of linear dimensions of test specimens SIST EN 13163:2009



EN 13163:2008 (E) 7 EN 12086, Thermal insulating products for building applications — Determination of water vapour transmission properties EN 12087, Thermal insulating products for building applications — Determination of long-term water absorption by immersion EN 12088, Thermal insulating products for building applications — Determination of long term water absorption by diffusion EN 12089, Thermal insulating products for building applications — Determination of bending behaviour EN 12090, Thermal insulating products for building applications — Determination of shear behaviour EN 12091, Thermal insulating products for building applications — Determination of freeze-thaw resistance EN 12431, Thermal insulating products for building applications — Determination of thickness for floating floor insulating products EN 12667, Thermal performance of building materials and products — Determination of thermal resistance by means of guarded hot plate and heat flow meter methods — Products of high and medium thermal resistance EN 12939, Thermal performance of building materials and products — Determination of thermal resistance by means of guarded hot plate and heat flow meter methods — Thick products of high and medium thermal resistance EN 13172:2008, Thermal insulating products — Evaluation of conformity
EN 13501-1, Fire classification of construction products and building elements — Part 1: Classification using data from reaction to fire test EN 13793, Thermal insulating products for building applications — Determination of behaviour under cyclic loading
EN 13823, Reaction to fire tests for building products — Building products excluding floorings exposed to the thermal attack by a single burning item EN 29052-1, Acoustics — Determination of dynamic stiffness — Part 1: Materials used under floating floors in dwellings EN ISO 1182, Reaction to fire tests for building products — Non-combustibility test (ISO 1182:2002) EN ISO 1716, Reaction to fire tests for building products — Determination of the heat of combustion (ISO 1716:2002) EN ISO 9229, Thermal insulation — Vocabulary (ISO 9229:2007) EN ISO 10456, Building materials and products — Hygrothermal properties — Tabulated design values and procedures for determining declared and design thermal values (ISO 10456:2007)
EN ISO 11925-2, Reaction to fire tests — Ignitability of building products subjected to direct impingement of flame – Part 2: Single-flame source test (ISO 11925-2:2002) ISO 12491, Statistical methods for quality control of building materials and components
SIST EN 13163:2009



EN 13163:2008 (E) 8 3 Terms, definitions, symbols, units and abbreviated terms 3.1 Terms and definitions For the purposes of this document, the following terms and definitions apply. Other relevant definitions are to be found in EN ISO 9229. 3.1.1 expanded polystyrene (EPS) rigid cellular plastic material, manufactured by moulding beads of expandable polystyrene or one of its copolymers, with an air filled closed cellular structure 3.1.2 expanded polystyrene block rigid insulation product or material generally of rectangular cross section and with a thickness not significantly smaller than the width NOTE Blocks are supplied trimmed or untrimmed. 3.1.3 expanded polystyrene board rigid insulation product (cut, moulded, or continuously foamed) of rectangular shape and cross section in which the thickness is significantly smaller than the other dimensions
NOTE 1 Boards may be of uniform thickness or tapered.
NOTE 2 The board edges may be of various sorts (e.g. square, half lapped, tongue and groove). 3.1.4 expanded polystyrene roll boards or strips bonded to a flexible facing, supplied in a wound or folded form, which form a continuous insulation layer when unrolled 3.1.5 preformed ware insulation shapes formed by cutting or grinding from blocks or boards or by shape moulding 3.1.6 level given value, which is the upper or lower limit of a requirement; the level is given by the declared value of the characteristic concerned 3.1.7 class combination of two levels of the same property between which the performance shall fall, where the levels are given by the declared value of the characteristic concerned 3.2 Symbols, units and abbreviated terms 3.2.1 Symbols and units used in this standard 1 – α is the prediction interval 1 b is the width mm c is the compressibility mm d is the thickness mm δ is the water vapour permeability mg/(Pa⋅h⋅m)SIST EN 13163:2009



EN 13163:2008 (E) 9 dB is the thickness under a load of 2 kPa after removal of an additional load of 48 kPa mm dL is the thickness under a load of 250 Pa mm dN is the nominal thickness of the product mm ds is the thickness of the test specimen mm ∆εb is the relative change in width % ∆εd is the relative change in thickness % ∆εl is the relative change in length % ε1 is the deformation after step A in accordance with EN 1605 % ε2 is the deformation after step B in accordance with EN 1605 % εct is the compressive creep % εt is the total relative thickness reduction % Edyn is the dynamic elasticity modulus MN/m2 k is a factor related to the number of test results available 1 l is the length mm L is the thickness effect parameter 1 λ90,90 is the 90 % fractile with a confidence level of 90 % for the thermal conductivity W/(m⋅K) λD is the declared of thermal conductivity W/(m⋅K) λi is one test result of thermal conductivity W/(m⋅K) λ′i is one test result of thermal conductivity for which the thickness effect is not negligible W/(m⋅K) λmean is the mean thermal conductivity W/(m⋅K) λpred is the predicted thermal conductivity with a prediction interval of 90 % W/(m⋅K) µ is the water vapour diffusion resistance factor 1 n is the number of test results 1 ρa is the apparent density kg/m3 R90/90 is the 90 % fractile with a confidence level of 90 % for the thermal resistance m2⋅K/W RD is the declared thermal resistance m2⋅K/W Ri is one test result of thermal resistance m2⋅K/W R′i is one test result of thermal resistance for which the thickness effect is not negligiblem2⋅K/W Rmean is the mean thermal resistance m2⋅K/W s′ is the dynamic stiffness MN/m3 σ10 is the compressive stress at 10 % deformation kPa σ10,mean is the mean compressive stress at 10 % deformation kPa σ10,pred is the predicted compressive stress at 10 % deformation with a prediction interval of 90 % kPa SIST EN 13163:2009



EN 13163:2008 (E) 10 σb is the bending strength kPa σc is the compressive stress kPa σmt is the tensile strength perpendicular to faces kPa Sb is the deviation from squareness mm/m sλ is the estimate of the standard deviation of the thermal conductivity W/(m⋅K) Smax is the deviation from flatness mm sR is the estimate of the standard deviation of the thermal resistance m2⋅K/W t is the testing time d τ is the shear strength kPa WdV is the water absorption by diffusion % Wlp is the long-term water absorption by partial immersion kg/m2 Wlt is the long-term water absorption by total immersion % X0 is the initial deformation after 60 s from the beginning of the loading mm Xct is the compressive creep mm Xt is the deformation at time t (total thickness reduction) mm Z is the water vapour resistance m2⋅h⋅Pa/mg BS is the symbol of the declared level for bending strength CC (i1/i2/y) σc is the symbol of the declared level for compressive creep* CP is the symbol of the declared level for compressibility CS(10)i is the symbol of the declared level for compressive stress at 10 % deformation* DS(N) is the symbol of the declared class for dimensional stability under constant normallaboratory conditions DS(TH) is the symbol of the declared level for dimensional stability under specified temperatureand humidity DLT is the symbol of the declared level for dimensional stability under load and temperatureconditions L is the symbol of the declared class for length tolerances MUi is the symbol of the declared water vapour* P is the symbol of the declared class for flatness tolerance S is the symbol of the declared class for squareness tolerance SDi is the symbol of the declared level for dynamic stiffness* Ti is the symbol of the declared class for thickness tolerance* TRi is the symbol of the declared level for tensile strength perpendicular to faces* W is the symbol of the declared class for width tolerance WD(V) is the symbol of the declared level for water absorption by diffusion WL(T) is the symbol of the declared level for long term water absorption by total immersion Zi is the symbol of the declared water vapour resistance value* * "i" is the relevant class or level, "σc" is the compressive stress, and "y" is the number of years. SIST EN 13163:2009



EN 13163:2008 (E) 11 3.2.2 Abbreviated terms used in this standard EPS Expanded PolyStyrene ITT Initial Type Test RtF Reaction to Fire FPC Factory Production Control 4 Requirements 4.1 General Product properties shall be assessed in accordance with Clause 5. To comply with this standard, products shall meet the requirements of 4.2, and the requirements of 4.3 as appropriate. NOTE Information on additional properties is given in Annex D. One test result for a product property is the average of the measured values on the number of test specimens given in Table 13. Wherever limit values are used, they shall represent the value achieved by at least 90 % of the production with a confidence level of 90 %. For mechanical properties no single measured value within the consecutive group used for obtaining the test result, shall be more than 10 % lower than the limit value defining the level. For non-mechanical properties a deviation from the limit value may be required and where appropriate these are expressed in the text. 4.2 For all applications 4.2.1 Thermal resistance and thermal conductivity Thermal resistance and thermal conductivity shall be based upon measurements carried out in accordance with EN 12667 or EN 12939 for thick products. The thermal resistance and the thermal conductivity shall be determined in accordance with Annex A and declared by the manufacturer according to the following:  the reference mean temperature shall be 10 °C;  the measured values shall be expressed with three significant figures; NOTE Zeros on the left hand side are not counted as significant figures.  for products of uniform thickness, the thermal resistance, RD, shall always be declared. The thermal conductivity, λD, shall be declared where possible. Where appropriate, for products of non-uniform thickness (e.g. for sloped and tapered products) only the thermal conductivity, λD, shall be declared.  the declared thermal resistance, RD, and the declared thermal conductivity, λD, shall be given as limit values representing at least 90 % of the production, determined with a confidence level of 90 %;  the value of thermal conductivity, λ90/90, shall be rounded upwards to the nearest 0,001 W/(m⋅K) and declared as λD in levels with steps of 0,001 W/(m⋅K);  the declared thermal resistance, RD, shall be calculated from the nominal thickness, dN, and the corresponding thermal conductivity, λ90/90, unless measured directly. For products for which compressibil
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