BS ISO 4708:2015 pdf free.Composition cork – Gasket material- Test methods.
BS ISO 4708 specifies test methods to determine the characteristics of agglomerated composition cork and rubbercork to be used as gaskets in the mechanical industry. The following characteristics are considered:
— thickness,
— apparent density,
— tensile strength,
— compressibility and recovery.
— flexibility,
— resistance to boiling water,
— behaviour in fluids.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 633, Cork — Vocabulary
ISO 2859-1, Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection
ISO 7322:2014, Composition cork — Test methods
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 633 and the following apply.
3.1 composition cork product obtained from the agglutination of cork granules with the addition of a binder generally not derived from cork wood cells
3.2 rubbercork product manufactured as a compound of cork granules and rubber, which can be used either in the form of granules or as a binder
4.1 Series of mandrels, with diameters ranging from 8 mm to 25 mm, in steps of 1 mm.
4.2 Air circulation oven, capable of being maintained at (100 ± 2) °C.
4.3 Open containers.
4.4 Oven or climatic room, capable of being maintained at (23 ± 5) °C and (50 ± 5) % relative humidity
4.5 Absorbent paper, of analysis type.’)
4.6 Aluminium foil.
4.7 Cutting system. to cut the test specimens.
5 Reagents
See Annex A.
5.1 ASTM IRM 903 oil.2)
5.2 ASTM IRM 901 oil.2)
5.3 ASTM Fuel A.2
6 Sampling and preparation of test specimens
6.1 Sampling
The number of packages from each lot (at least three packages) and the quantity of material to be taken from the sample shall be in accordance with Iso 2859-1 for the inspection level agreed between the interested parties.
6.2 Preparation of the test specimens
6.2.1 From each sheet of material and using the cutting system (4.7), take test specimens at a distance of at least 100 mm from the edges. The number and dimensions of the test specimens shall be as specified in Table 1. Each test specimen shall be squarely cut with the edges perpendicular to its surface, and shall not show any cracks or folds.
6.2.2 The minimum and the maximum thicknesses of the test specimens for testing flexibility are specified in Table 2.BS ISO 4708 pdf free download.