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Physical & Chemical properties

Vapour pressure

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Description of key information

At temperatures between 58°C to 100°C vapour pressure between 0.92 to 11.4 mBar were measured for 1,1-bis(tert-butylperoxy)cyclohexane.

Key value for chemical safety assessment

Vapour pressure:
12.3 Pa
at the temperature of:
25 °C

Additional information

The vapour pressure of 1,1-bis(tert-butylperoxy)cyclohexane, 82% in isododecane, was measured at various temperatures with vaccum DSC. The temperature range of the method is limited. The lower pressure limit depends on the capacity of the vacuumpump (about 0.5 mbar), the lower temperature limit of the DSC-apparatus (25°C) or by the melting point of the product. The upper limit depends on the thermal stability of the product.In the case 1,1-bis(tert-butylperoxy)cyclohexane the lower pressure is limited by the pumpcapacity.The vapour pressure of 1,1-bis(tert-butylperoxy)cyclohexane in the temperature range of 58°C to 100°C was measured although the temperatures were above the SADT. That was feasible in this DSC test as the amounts used were low and the measurements were very fast. At temperatures between 58°C to 100°C vapour pressure between 0.92 to 11.4 mBar was measured for 1,1-bis(tert-butylperoxy)cyclohexane. Extrapolation of the obtained results showed that the error in the pressure will increase at extrapolation.

For chemical safety assessment the vapour pressure was estimated to be 12.3 Pa at 25 °C.