EN ISO 845:2009 PDF

Name: EN ISO 845:2009 — Cellular plastics and rubbers - Determination of apparent density (ISO 845:2006)
SKU: EN ISO 845:2009
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Cellular plastics and rubbers - Determination of apparent density (ISO 845:2006)

Название (английский):

EN ISO 845:2009

Cellular plastics and rubbers - Determination of apparent density (ISO 845:2006)

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 11
Дата публикации:: 24 июня 2009 г.
Издание:: CEN EN 845 edition 2 version 1
ICS:: 83.100

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Описание (английский):

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.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

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.

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.

EN ISO 845:2009 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications

Who should use this standard

Related standards

Технические детали

ISO 845:2006

Cellular plastics and rubbers — Determination of apparent density

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