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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Endpoint summary

Administrative data

Description of key information

[1,3-phenylenebis(1-methylethylidene)]bis[tert-butyl] peroxide is an Organic Peroxide Type D and has a SADT of 80 ºC.

[1,3-phenylenebis(1-methylethylidene)]bis[tert-butyl] peroxide is an off-white to yellow solid

The melting range of [1,3 -phenylenebis(1 -methylethylidene)]bis[tert-butyl] peroxide is between 41.5°C to 51.0°C at normal pressure.

The relative density of [1,3-phenylenebis(1-methylethylidene)]bis[tert-butyl] peroxide is 1.042 at 20ºC.

No boiling point is available because the peroxide decomposes before boiling (its Self Accelerating Decomposition Temperature (SADT) is around 80°C.

Granulometry: Light microscopic examination showed a flake type granular product, no fibres were observed. The fraction < 100 µm of [1,3-phenylenebis(1-methylethylidene)]bis[tert-butyl] peroxide is 3.1% (m/m). The PSD(particle size distribution)-characteristics are : d10 is 22µm, d50 is 69µm and d90 is 132µm.

The vapour pressure of [1,3-phenylenebis(1-methylethylidene)]bis[tert-butyl] peroxide seemsvery low(estimated by calculation at 0.0091 Pa at 25°C and measured at 0.00012 Pa at 20°C for related 25155-25-3).

[1,3-phenylenebis(1-methylethylidene)]bis[tert-butyl] peroxide is considered as insoluble in water based on the water solubility of 0,04 mg/Lat 20°C for related 25155 -25 -3,

[1,3-phenylenebis(1-methylethylidene)]bis[tert-butyl] peroxide is potentially bioaccumulable based on a calculated logKow value of 7,3.

Flammability is an intrinsic hazard of organic peroxides.

[1,3-phenylenebis(1 -methylethylidene)]bis[tert-butyl] peroxide is non explosive.

The oxidising properties has not been evaluated (the substance is an organic peroxide).

Additional information