Signification et objectif
4.1 en raison de l'utilisation potentielle de plastiques cellulaires rigides, ils sont diversifiés, so the effective behavior of human exposure to estimate these materials need to a large extent based on the desired application. Pour ça, the test method is designed to recommend a variety of conditions, select one or more required exposure conditions. (Note 3)

4.2 The conditions recommended in this test method have been widely used to artificially expose rigid porous plastics and to determine the effects of various temperatures and humidity on these materials. The ultimate test measured value in determining sample after return to room temperature. In the specified case, samples will be tested under exposure conditions but will need to be reported.

4.3 through the test method for measuring the size of the changes can be used to compare the material performance in a specific environment, evaluation of two or more relative stability of porous plastic, or specify particular materials acceptance criteria. The results of this testing method are not suitable for predicting end-use product performance or characteristics and are not sufficient for engineering or design calculations.

Méthode d'essai standard ASTM D2126-2020 pour les réactions de vieillissement thermique et humide des plastiques en mousse rigide

Note 3: If a thermal shock is known or suspected to occur as a result of rapid heating to (or cooling from) a specific temperature, guidance should be obtained from the manufacturer of the material in question as to the allowable heating or cooling rate or both.

Note 4: the size of the sample changes may be due to the age of the sample or sample preparation and testing began between the length of time or both.

4.4 Before performing this test method, reference should be made to the specifications of the material being tested. Material specification or its portfolio covers any sample preparation, adjustment, size or test parameters should be prior to this test method mentioned in the argument. If there is no specification, the default condition applies.

Méthode d'essai standard ASTM D2126-2020 pour les réactions de vieillissement thermique et humide des plastiques en mousse rigide

Champ d'application
1.1 The test method covers heat exposure and moisture exposure procedures for rigid porous plastics. The terms of use shall be agreed between the buyer and the supplier.

Note 1: the list common exposure conditions are shown in table 1.

1.2 to SI units shall be deemed to be standard. Les valeurs entre parenthèses sont à titre indicatif uniquement.

1.3 Cette norme n'est pas destinée à traiter tous les problèmes de sécurité, si seulement, associé à son utilisation. Il est de la responsabilité de l'utilisateur de cette norme d'établir des mesures de sécurité appropriées., pratiques sanitaires et environnementales et pour déterminer l’applicabilité des restrictions réglementaires avant utilisation.

Note 2: this test method on sampling and part equivalent to ISO 2796. It is not equivalent to ISO 2796 in the procedures section.

1.4 La présente Norme internationale a été élaborée conformément aux principes de normalisation internationalement reconnus établis dans la Décision sur les principes pour l'élaboration de normes internationales., Lignes directrices et recommandations émises par le Comité des obstacles techniques au commerce de l'Organisation mondiale du commerce.