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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Appearance / physical state / colour

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Administrative data

Link to relevant study record(s)

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Endpoint:
appearance / physical state / colour
Type of information:
other: visual observation
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Remarks:
peer-reviewed
Principles of method if other than guideline:
No specification of method
GLP compliance:
not specified
Physical state at 20°C and 1013 hPa:
solid
Remarks:
hexagonal prisms
Form:
crystalline
Substance type:
organic
Conclusions:
According to data from this handbook, hydroquinone is a crystalline solid that can be found as hexagonal prisms.
Endpoint:
appearance / physical state / colour
Type of information:
other: visual observation
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Remarks:
peer-reviewed
Principles of method if other than guideline:
No specification of method
GLP compliance:
not specified
Physical state at 20°C and 1013 hPa:
solid
Form:
crystalline
Substance type:
organic
Conclusions:
According to data from this peer-reviewed handbook, hydroquinone is a crystalline solid.
Endpoint:
appearance / physical state / colour
Type of information:
other: visual observation
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Remarks:
peer-reviewed
Principles of method if other than guideline:
No specification of method
GLP compliance:
not specified
Physical state at 20°C and 1013 hPa:
solid
Remarks:
trigonal prisms
Form:
crystalline
Colour:
white
Substance type:
organic
Conclusions:
According to the data from this peer-reviewed handbook, hydroquinone is a white crystalline solid that can be found as monoclinic prisms, trigonal prisms or needles.
Endpoint:
appearance / physical state / colour
Type of information:
other: visual observation
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Remarks:
peer-reviewed
Principles of method if other than guideline:
No specification of method
GLP compliance:
not specified
Physical state at 20°C and 1013 hPa:
solid
Remarks:
monoclinic prisms
Form:
crystalline
Colour:
white
Substance type:
organic
Conclusions:
According to the data from this peer-reviewed handbook, hydroquinone is a white crystalline solid that can be found as monoclinic prisms, trigonal prisms or needles.
Endpoint:
appearance / physical state / colour
Type of information:
other: visual observation
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Remarks:
peer-reviewed
Principles of method if other than guideline:
No specification of method
GLP compliance:
not specified
Physical state at 20°C and 1013 hPa:
solid
Remarks:
needles
Form:
crystalline
Colour:
white
Substance type:
organic
Conclusions:
According to the data from this peer-reviewed handbook, hydroquinone is a white crystalline solid that can be found as monoclinic prisms, trigonal prisms or needles.
Endpoint:
appearance / physical state / colour
Type of information:
experimental study
Remarks:
visual observation
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Remarks:
peer-reviewed
Principles of method if other than guideline:
No specification of method
GLP compliance:
not specified
Physical state at 20°C and 1013 hPa:
solid
Remarks:
monoclinic prisms (sublimation); needles from water; prisms from methanol.
Form:
crystalline
Colour:
Colorless, light-tan, light-gray, white
Odour:
odourless
Substance type:
organic
Conclusions:
According to this database of peer-reviewed literature, hydroquinone is an odorless organic crystalline solid that can be found as needles, prisms and monoclinic prisms. It can be colorless, light-tan, light-gray or white.
Executive summary:

According to this database of peer-reviewed literature, hydroquinone is an odorless organic crystalline solid that can be found as needles, prisms and monoclinic prisms. It can be colorless, light-tan, light-gray or white.

Description of key information

Hydroquinone is an odorless organic, crystalline solid

Key value for chemical safety assessment

Physical state at 20°C and 1013 hPa:
solid
Form:
solid: crystalline

Additional information

Hydroquinone is an odorless organic, crystalline solid that can be found as needles, prisms and monoclinic prisms. It can be colorless, light-tan, light-grey or white.