Tread stock natural 68 58-123 0.378 99-27surface (Table I). Figure 5 shows the results of free sulfur determinations made at the center section of the slabs. From these and similar curves for modulus, hardness, and hysteresis the additional time required for reaching an equivalent state of cure was scaled. This additional time is that required for the thicker sheets to give a state of cure comparable to that of Vis-inch sheet. These additional times for compound H are shown in_Figure 6 as compared with those calculated for a natural rubber tread stock having a diffusivity of 0.014 square inch per minute, and those calculated for compound H, using a diffusivity of 0.0118 square inch, from the values found for specific heat and thermal conductivity as given in Table II. The difference between these curves and that for compound H is appreciable and indicates that the allowances in use for natural rubber products for increased thicknesses do not apply to GR-S.It was thought that the difference may be due to differences in thermal conductivity Or specific heat. Determinations were made of both properties (Table II). These differences between GR-S and natural rubber are insufficient to account for the more rapid rate of cure observed in thick specimens. CONCLUSIONS 1.
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