C versus Shore A hardness

The brittle points generally range from -40°C for the most-flexible grades up to -30°C for the most-rigid grades. 

Between the ambient temperature and -25°C, the 100% modulus of an 80 Shore A grade is multiplied by 2.3. 

These results relate to some grades only and cannot be generalized. 

The continuous use temperatures in an unstressed state are generally estimated at 100°C up to 125°C. 

Service temperatures are lower under loading because of modulus decay, strain, creep, relaxation... 

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Figure 4.135. SBS SEBS compression set (%) after 22h at20°C versus Shore A hardness...

PVC has slightly better-low-temperature brittleness than does the DOP-plasticized PVC. At equivalent Shore A 70 hardness, L9P and DINA give improvements in brittleness temperature by about —10 and —28 °C, respectively, versus DOP. As Fig. 7.3 also suggests, the low-temperature brittleness of DINA blends with any of the phthalates will fall in the expected intermediate ranges, as a function of the plasticizer blend composition. 

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