Table 1. Initial Physical Properties, Lifetime Limits, and Failure Times for Each Test Item Under Accelerated Temperatures

Physical properties		Elongation at break (%)	Tensile strength (MPa)	Hardness (Shore A)	Shear strength (MPa)	Water absorption (%)
Pristine property		45.19	0.38	38	0.38	0.19
Lifetime limit		22.60	0.50	53	0.57	0.29
Failure time (hr)	120°C	779	556	516	231	1147
	140°C	276	137	298	148	982
	160°C	10	41	103	74	393