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Tert-amyl hydroperoxide is a liquid organic peroxide, Type E (determined by UN test method), with a SADT (Self-Accelerating Decomposition Temperature) of >58°C. The substance has a melting range of -20.2 ;-4.6°C; the boiling point

is greater than SADT. The flash point is 36.5°C. The substance is volatile (vapor pressure of 4.3kPa).The relative density at 20°C is close to water (0.9).