Assertion: radial tire's cord | /r/CapableOf | become low
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Source sentences:
text: This is because, when the glass-transition temperature of the thermoplastic high molecular weight polymer is lower than −90° C., the creep when the polymer is used at a high temperature becomes large; and when the glass-transition temperature is 180° C. or higher, the polymer becomes too hard so that the stress relaxation which is specific to a soft thermoplastic resin becomes small, and the cord fatigability under a high strain environment such as when a tire is used becomes low.