| http://www.w3.org/ns/prov#value | - The softening agents used are those commonly used in rubber, for example, petroleum type softeners such as process oil, lubricating oil, paraffin, liquid paraffin, petroleum asphalt and vaseline; coal tar type softeners such as coal tar, and coal tar pitch; fatty oil type softeners such as castor oil, linseed oil, rapeseed oil and coconut oil; tall oil; factice; waxes such as beeswax, carnauba wax
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