BS ISO 21844:2018 pdf download – Cellular plastic — Cellulose foam thermal insulation — Material specification
This document specifies material requirements and identifies the test methods to be used to determine these requirements for cellulose foam for thermal insulation for buildings and other applications.
There are four categories of material characterized by the density of the material.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements 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.
ISO 844, Rigid cellular plastics — Determination of compression properties
ISO 845, Cellular plastics and rubbers — Determination of apparent density
ISO 1209-1, Rigid cellular plastics — Determination of flexural properties — Part 1: Basic bending test
ISO 1663, Rigid cellular plastics — Determination of water vapour transmission properties
ISO 2796, Cellular plastics, rigid — Test for dimensional stability
ISO 2896, Rigid cellular plastics — Determination of water absorption
ISO 8301, Thermal insulation — Determination of steady-state thermal resistance and related properties — Heat flow meter apparatus
ISO 11561, Ageing of thermal insulation materials — Determination of the long-term change in thermal resistance of closed-cell plastics (accelerated laboratory test methods)
ISO 12576-1, Thermal insulation — Insulating materials and products for buildings — Conformity control systems — Part 1: Factory-made products
ISO 16000-4, Indoor air — Part 4: Determination of formaldehyde — Diffusive sampling method
ISO 16000-9, Indoor air — Part 9: Determination of the emission of volatile organic compounds from building products and furnishing — Emission test chamber method
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at
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cellular foam
cellular material made by combining cellulose material with starch in a manufacturing process
4.7 Dimension Dimension tolerance of the material shall be not greater than indicated in Table 2. For length and width, average the value of three specimens measured to within 1 mm using a ruler with the specimens spread flatways. For thickness, average the value of three specimens measured to within 0,1 mm using a thickness gauge.
5 Test methods
5.1 Sampling Enough material shall be selected randomly for the preparation of the test specimens in the required quantity. All samples shall be from the same production or batch. If the material is intended to be coated with a sheet, the samples shall be collected before the sheet is coated.
5.2 Specimen preparation Prepare the test specimens in the size and quantity as required by the test method. In cases where the test method does not state the quantity, there shall be three specimens prepared and tested.
5.3 Appearance Inspect the specimens for surface defects such as apparent scratches, deformation, large hollows, etc. Discard all specimens that have surface defects.
5.4 Conditioning of specimens Condition the test specimens at:
(23 ± 2) °C and (50 ± 10) % relative humidity or (23 ± 2) °C and 50 10 20 − + % relative humidity or (23 ± 2) °C and 65 10 20 − + % relative humidity for a minimum of 24 h.
5.5 Laboratory conditions when testing is conducted
The laboratory where the testing is conducted shall maintain the temperature of (23 ± 5) °C and the humidity shall be (50 ± 20) %.
6 Conformity control
For the purposes of sampling and conformity control, the manufacturer shall declare which systems described in ISO 12576-1 are used in the manufacturing process.
7 Marking and labelling
The product shall be marked or the package shall be labelled with the following information:
a) product name;
b) dimensions;
c) manufacturer’s name and address;
d) manufacturing code, lot number, batch number or other means by which to identify the production;
e) the reference of this document, i.e. ISO 21844.
8 Report
8.1 Test data shall be reported in the form of a table with the columns for:
a) property;
b) test result;
c) pass/fail, and
d) whether the test results for the property met the requirements of this document.