NF ISO 3384
Rubber, vulcanized or thermoplastic - Determination of stress relaxation in compression at ambient and at elevated temperatures
ISO 3384:2005 specifies two methods for determining the decrease in counterforce exerted by a test piece of vulcanized or thermoplastic rubber which has been compressed to a constant deformation and maintained thus at a predetermined test temperature. Two forms of test piece are permitted: cylindrical test pieces and rings. The use of ring test pieces is particularly suitable for the determination of stress relaxation in liquid environments. Testing at temperatures below standard laboratory temperature is not specified. The methods have been used for low-temperature testing, but their reliability under these conditions is not proven.
ISO 3384:2005 specifies two methods for determining the decrease in counterforce exerted by a test piece of vulcanized or thermoplastic rubber which has been compressed to a constant deformation and maintained thus at a predetermined test temperature.
Two forms of test piece are permitted: cylindrical test pieces and rings. The use of ring test pieces is particularly suitable for the determination of stress relaxation in liquid environments.
Testing at temperatures below standard laboratory temperature is not specified. The methods have been used for low-temperature testing, but their reliability under these conditions is not proven.
<p>ISO 3384-1-2011 specifies two methods for determining the decrease in counterforce exerted by a test piece of vulcanized or thermoplastic rubber which has been compressed to a constant deformation and maintained thus at a predetermined test temperature. The counterforce can be determined either by means of a continuous-measurement system or by a discontinuous-measurement one.</p> <p>Two forms of test piece are permitted: cylindrical test pieces and rings. Different shapes and sizes of test piece give different results, and comparison of results should be limited to test pieces of similar size and shape. The use of ring test pieces is particularly suitable for the determination of stress relaxation in liquid environments.</p> <p>ISO 3384-1 deals only with testing at constant ambiant or elevated temperature. Testing at temperatures below standard laboratory temperature is not specified. The methods have been used for low-temperature testing, but their reliability under these conditions is not proven.</p>
- Avant-proposiv
- Introductionv
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1 Domaine d'application1
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2 Références normatives1
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3 Termes et définitions2
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4 Principe de la méthode2
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5 Appareillage2
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6 Éprouvette3
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6.1 Type et préparation3
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6.2 Mesurage des dimensions des éprouvettes4
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6.3 Nombre d'éprouvettes4
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6.4 Délai entre vulcanisation et essais4
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6.5 Conditionnement des éprouvettes4
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7 Durée, température et liquide d'essai5
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7.1 Durée de l'essai5
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7.2 Température d'exposition5
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7.3 Liquides d'immersion5
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8 Mode opératoire5
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8.1 Préparation5
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8.2 Mesurage de l'épaisseur6
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8.3 Méthode A6
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8.4 Méthode B6
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9 Expression des résultats7
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10 Fidélité des méthodes d'essai8
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10.1 Généralités8
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10.2 Détail relatifs à la fidélité8
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10.3 Résultats de fidélité8
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11 Rapport d'essai9
- Annexe A (informative) Indications pour l'utilisation des résultats de fidélité11
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