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5. Natural rubber properties
The density of natural rubber is 0.93 g/cm 3 .
Unfilled, vulcanized natural rubber has good tensile strength, with a breaking force of the order of 20 MPa and more. Unfilled vulcanized synthetic rubbers are generally not as strong (figure 6 b). Figure 6 a shows the raw (unvulcanized) force-elongation curves for NR natural rubber and IR unfilled synthetic polyisoprene.
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