CEN/TC 249/WG 8 - Cellular plastics

This document specifies, for flexible and rigid cellular polymeric materials, laboratory procedures which are intended to imitate the effects of naturally occurring reactions such as oxidation or hydrolysis by humidity. The physical properties of interest are measured before and after the application of the specified treatments.
Test conditions are only given for open cellular latex, both open- and closed-cell polyurethane foams, and closed-cell polyolefin foams. Conditions for other materials will be added as required.
The effect of the ageing procedures on any of the physical properties of the material can be examined, but those normally tested are either the elongation and tensile properties, or the compression or indentation hardness properties.
These tests do not necessarily correlate either with service behaviour or with ageing by exposure to light.
If desired, the ageing conditions contained in this document can be applied to composite structures containing any of the above types of cellular material. This can be helpful in the investigation of possible interactions between cellular materials and other substrates. Composite constructions can be in the form of complete finished products or representative small specimens cut there-from.

This document specifies three methods for determining the compression set of flexible cellular materials.
This document applies to latex and polyurethane foams of thickness greater than 2 mm.

This European Standard specifies a method for determining the cell count of flexible and rigid cellular polyurethane.

Cette norme internationale spécifie une méthode d'essai à petite échelle en laboratoire, permettant une première comparaison des caractéristiques relatives de combustion de petites éprouvettes de matériaux polymères alvéolaires souples, lorsqu'elles sont soumises, en position horizontale, à une source de chaleur de faible énergie. Elle est prévue uniquement pour l'estimation rapide et simple des caractéristiques de combustion des petites éprouvettes de matériaux, considérés sans référence aux conditions d'environnement sous lesquelles le matériau, ou les produits qui en découlent peuvent être utilisés. En conséquence, il n'est pas possible d'établir une corrélation entre les résultats de cet essai et la performance de tels matériaux ou produits dans des conditions réelles d'utilisation. L'essai est réduit aux éprouvettes d'essai d'une épaisseur supérieure à 5 mm. Les résultats des essais sur les éprouvettes d'essai de différentes épaisseurs ne sont pas comparables.  Cette méthode d'essai ne doit pas être utilisée pour estimer le risque potentiel de feu dans les conditions réelles d'emploi.

Contains the basic test procedures for the determination of the physical properties of these plastics. Also specifies the primary methods to be used for comparison of materials similar to materials as defined in clause 3. Likewise permits the use of the same test methods, when found to be suitable for the assessment of the properties of products of different thickness, when agreed upon by the supplier and the purchaser.

2014-03-14 GVN: Draft for // vote received in ISO/CS (see notification of 2014-03-14 in dataservice).
2013-07-22 LVO: Text for // ENQ received in ISO/CS (see notification of 2013-07-22 in dataservice).

Contains definitions and general measuring methods applying to all classes of photosensitive devices.

Migrated from Progress Sheet (TC Comment) (2000-07-10): new Tc forecast in BP Bli 991026

Migrated from Progress Sheet (TC Comment) (2000-07-10): SPPJ_26_Y_199905 ++ ISO under rev: Publish 22439 and revise as soon as rev ISO published (end 1995?) ++ 2nd FV will go out on a new ISO version (CM 9512). ++ According to Mr Levio, convenor of TC 249/WG 8, the ISO Doc published contains a ++ major mistake and should not be adopted by CEN until the mistake is rectified. ++ GLG/1997-10-03

Migrated from Progress Sheet (TC Comment) (2000-07-10): ISO under rev: FV on publ ISO rev. text