Passenger tire tread

R 50-52 S - - - - Passenger tire treads and mechanical rubber goods... 

F 48-58 s HAR 47,5 N330 76 Passenger tire treads, retreads, electrical products... 

Table 4.14 low rolling resistance passenger tire tread ... 

TESPT remained the industry standard coupling agent for sulfur cured rubber into the 1990s. With the development of HDS came expanded applications for silica-based compounds, particularly in high performance passenger tire treads which needed a combination of tread wear, low rolling resistance, and good wet traction (73). This combination of performance attributes can be simultaneously optimized to unique levels with silica. Recipes with 50-100 phr silica were now permissible and desirable. 

Volumewise, natural rubber represents about half of all the rubber used in producing tires today. Typically, natural rubber is used as a blend with either SBR or BR in tire rubber compounds. NR/SBR compound blends are used in the tire carcass coat, cushion gum, earth-mover retreads, light truck treads, bead filler, chaffer rim flange, and motorcycle treads. NR/BR compound blends are commonly used to make passenger tire treads, sidewalls, high-performance treads, camelback, and heavy-duty truck treads. 

Where great mechanical strength is not required, and thus carbon black not used, rubbers can be colored with pigments, just as plastics. A typical radial passenger-tire tread formulation is shown in Table 19.1. Notice that the additives (everything except SBR polymer and cw-polybutadiene) make up 122.25 parts per hundred parts polymer or more than half of the tire ... 

TABLE 19.1 Radial Passenger-Tire Tread Formulation... 

Table 1.1 Carbon Black-Based Passenger Tire Tread...

A typical radial passenger-tire tread formulation is shown in Table 21.1. Notice that the final compound is less than 45% polymer. 

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