EN ISO 845:2009
(Main)Cellular plastics and rubbers - Determination of apparent density (ISO 845:2006)
Cellular plastics and rubbers - Determination of apparent density (ISO 845:2006)
ISO 845:2006 specifies a method for determining the apparent overall density and the apparent core density of cellular plastics and rubbers.
If the material to be tested includes skins formed during a moulding/extrusion, the apparent overall density or the apparent core density, or both, can be determined. If the material does not have skins formed during moulding, the term "overall density" is not applicable.
Schaumstoffe aus Kautschuk und Kunststoffen - Bestimmung der Rohdichte (ISO 845:2006)
Diese Internationale Norm beschreibt ein Verfahren zur Bestimmung der Stoffdichte und der Materialdichte
von Schaumstoffen aus Kunststoffen und Kautschuk.
Falls an dem zu prüfenden Material eine beim Formen/Extrudieren gebildete Schmelzhaut vorhanden ist,
kann/können die Stoffdichte und/oder die Materialdichte bestimmt werden. Falls das Material keine Schmelzhaut
aufweist, darf die Benennung „Stoffdichte“ nicht verwendet werden.
Für umgeformte Materialien darf ein anderes Verfahren angewendet werden, z. B. das Auftriebsverfahren.
Caoutchoucs et plastiques alvéolaires - Détermination de la masse volumique apparente (ISO 845:2006)
L'ISO 845:2006 spécifie une méthode pour la détermination de la masse volumique globale et de la masse volumique apparente de la partie intérieure («âme») des caoutchoucs et des plastiques alvéolaires.
Si le matériau soumis à essai comprend des peaux formées en cours de moulage ou d'extrusion, on peut déterminer la masse volumique apparente globale ou la masse volumique de l'âme, ou les deux. Si le matériau ne comporte pas de peaux formées pendant le moulage ou l'extrusion, le terme «masse volumique globale» n'est pas applicable.
Penjeni polimerni materiali in gume - Določevanje navidezne gostote (ISO 845:2006)
General Information
- Status
- Published
- Publication Date
- 23-Jun-2009
- Withdrawal Date
- 30-Dec-2009
- Technical Committee
- CEN/TC 249 - Plastics
- Drafting Committee
- CEN/TC 249 - Plastics
- Current Stage
- 9092 - Decision on results of review/2YR ENQ - revise - Review Enquiry
- Start Date
- 16-Oct-2009
- Completion Date
- 16-Oct-2009
Relations
- Effective Date
- 27-Jun-2009
Overview
EN ISO 845:2009 (identical to ISO 845:2006) specifies a laboratory method for determining the apparent density of cellular plastics and rubbers. The standard covers measurement of both apparent overall density (including skins formed during moulding/extrusion) and apparent core density (after skins are removed). It applies to foamed plastics and rubbers where volume and mass can be measured; for some shaped materials a buoyancy method may be more appropriate.
Key topics and technical requirements
- Test specimens
- Minimum total specimen volume: 100 cm³.
- Minimum number of specimens: five.
- Specimens must be cut without deforming cellular structure and shaped so volume is easily calculated.
- Conditioning
- Wait at least 72 hours after manufacture before cutting specimens (may be reduced to 48 h or 16 h with supporting evidence).
- Specimens conditioned for at least 16 h in standard atmospheres or dry conditions per ISO 291.
- Standard atmospheres listed (examples): (23 ± 2) °C, (50 ± 10) % RH; alternatives at 23 °C/50 % RH or 27 °C/65 % RH.
- Apparatus & measurements
- Balance capability: 0.1 % accuracy recommended.
- Individual weighings: recorded to an accuracy of 0.5 %.
- Dimensional measurements made per ISO 1923; take at least three measurements of each dimension (five for central area of rigid boards).
- Calculation
- Density ρ (kg·m⁻³) = 10^6 × m / V (m in grams, V in mm³).
- Buoyancy correction is provided for very low-density closed-cell materials (explicit correction formula and air density values at 23 °C and 27 °C are given).
- Reporting
- Report shall include reference to the standard, material ID, conditioning conditions, presence/removal of skins, individual results, mean density, standard deviation, buoyancy corrections (if any) and any deviations from the procedure.
Applications
- Quality control and specification of cellular plastics and foams used in insulation, packaging, cushioning, automotive and construction components.
- Comparative testing in R&D to evaluate changes in foam formulation, processing or ageing affecting density.
- Supplier and contract testing where apparent overall density and apparent core density determine product performance and compliance.
Who should use this standard
- Materials test laboratories, quality engineers, product developers, foam manufacturers, and procurement teams specifying foam density requirements.
- Regulatory bodies or certification organizations needing a harmonized method for foam density measurement.
Related standards
- ISO 291 - Standard atmospheres for conditioning and testing (referenced for conditioning).
- ISO 1923 - Determination of linear dimensions for cellular plastics and rubbers (referenced for dimensional measurement).
Keywords: EN ISO 845, ISO 845:2006, apparent density, foam density determination, cellular plastics, cellular rubbers, apparent overall density, apparent core density, conditioning, buoyancy correction.
Frequently Asked Questions
EN ISO 845:2009 is a standard published by the European Committee for Standardization (CEN). Its full title is "Cellular plastics and rubbers - Determination of apparent density (ISO 845:2006)". This standard covers: ISO 845:2006 specifies a method for determining the apparent overall density and the apparent core density of cellular plastics and rubbers. If the material to be tested includes skins formed during a moulding/extrusion, the apparent overall density or the apparent core density, or both, can be determined. If the material does not have skins formed during moulding, the term "overall density" is not applicable.
ISO 845:2006 specifies a method for determining the apparent overall density and the apparent core density of cellular plastics and rubbers. If the material to be tested includes skins formed during a moulding/extrusion, the apparent overall density or the apparent core density, or both, can be determined. If the material does not have skins formed during moulding, the term "overall density" is not applicable.
EN ISO 845:2009 is classified under the following ICS (International Classification for Standards) categories: 83.100 - Cellular materials. The ICS classification helps identify the subject area and facilitates finding related standards.
EN ISO 845:2009 has the following relationships with other standards: It is inter standard links to EN ISO 845:1995. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase EN ISO 845:2009 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of CEN standards.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Schaumstoffe aus Kautschuk und Kunststoffen - Bestimmung der Rohdichte (ISO 845:2006)Caoutchoucs et plastiques alvéolaires - Détermination de la masse volumique apparente (ISO 845:2006)Cellular plastics and rubbers - Determination of apparent density (ISO 845:2006)83.100Penjeni polimeriCellular materialsICS:Ta slovenski standard je istoveten z:EN ISO 845:2009SIST EN ISO 845:2009en,fr,de01-oktober-2009SIST EN ISO 845:2009SLOVENSKI
STANDARDSIST EN ISO 845:19991DGRPHãþD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN ISO 845June 2009ICS 83.100Supersedes EN ISO 845:1995
English VersionCellular plastics and rubbers - Determination of apparent density(ISO 845:2006)Caoutchoucs et plastiques alvéolaires - Détermination de lamasse volumique apparente (ISO 845:2006)Schaumstoffe aus Kautschuk und Kunststoffen -Bestimmung der Rohdichte (ISO 845:2006)This European Standard was approved by CEN on 30 May 2009.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:
Avenue Marnix 17,
B-1000 Brussels© 2009 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 845:2009: ESIST EN ISO 845:2009
Reference numberISO 845:2006(E)© ISO 2006
INTERNATIONAL STANDARD ISO845Third edition2006-12-01Cellular plastics and rubbers — Determination of apparent density Caoutchoucs et plastiques alvéolaires — Détermination de la masse volumique apparente
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ii
ISO 845:2006(E) © ISO 2006 – All rights reserved
iiiContents Page Foreword.iv 1 Scope.1 2 Normative references.1 3 Terms and definitions.1 4 Apparatus.1 5 Test specimens.2 5.1 Dimensions.2 5.2 Number of test specimens.2 5.3 Conditioning.2 6 Procedure.2 7 Expression of results.3 8 Accuracy.3 9 Test report.4
ISO 845:2006(E) iv
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