This document specifies two methods for the determination of the compression set characteristics of vulcanized and thermoplastic rubbers at low temperatures. Method 1 derives from the methodology used in ISO 815-1. Method 2 uses a specified testing device, allowing to measure and record the test piece thickness during recovery. Due to the load applied during recovery in method 2, no correlation can be established between the results given by both methods. NOTE When rubber is held under compression, physical or chemical changes that prevent the rubber returning to its original dimensions after release of the deforming force can occur. The result is a set, where the magnitude of which depends on the time and temperature of compression as well as on the time, temperature, and conditions of recovery. At low temperatures, changes resulting from the effects of glass hardening or crystallization become predominant and, since these effects are reversed by raising the temperature, therefore, the measurements are always taken at the test temperature.
This document specifies two methods for the determination of the compression set characteristics of vulcanized and thermoplastic rubbers at low temperatures.
Method 1 derives from the methodology used in ISO 815-1. Method 2 uses a specified testing device, allowing to measure and record the test piece thickness during recovery. Due to the load applied during recovery in method 2, no correlation can be established between the results given by both methods.
NOTE When rubber is held under compression, physical or chemical changes that prevent the rubber returning to its original dimensions after release of the deforming force can occur. The result is a set, where the magnitude of which depends on the time and temperature of compression as well as on the time, temperature, and conditions of recovery. At low temperatures, changes resulting from the effects of glass hardening or crystallization become predominant and, since these effects are reversed by raising the temperature, therefore, the measurements are always taken at the test temperature.
Le présent document spécifie deux méthodes pour la détermination des caractéristiques de déformation rémanente après compression, à basses températures, des caoutchoucs vulcanisés ou thermoplastiques de dureté comprise entre 10 DIDC et 95 DIDC. La méthode 1 découle de la méthodologie utilisée dans la NF ISO 815-1 qui concerne la détermination desdites caractéristiques à températures ambiantes ou élevées ; la méthode 2 utilise un dispositif d'essai permettant de mesurer et d'enregistrer l'épaisseur de l'éprouvette lors de la reprise élastique. Ce document décrit l'appareillage à utiliser et son programme d'étalonnage (voir Annexe A), les éprouvettes, les conditions d'essais, les modes opératoires, l'expression des résultats et le contenu du rapport d'essai.
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