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Physical & Chemical properties

Appearance / physical state / colour

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Reference
Endpoint:
appearance / physical state / colour
Type of information:
other: information from commercial production process
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Remarks:
Information contained in an authoritative, standard reference work in industrial chemistry. The author was employed at the Amoco Chemical Company, with direct access to company data/information relevant to the commercial production of terephthalic acid.
Reason / purpose:
reference to same study
Physical state at 20°C and 1013 hPa:
solid
Form:
other: Free-flowing powder composed of rounded crystals. Forms needles if crystallised slowly, but these may alter flow characteristics.
Colour:
White, when purified to the grade required for use as a polyester feedstock.
Substance type:
organic
Conclusions:
Terephthalic acid is an organic substance commercially available as a white, free-flowing, crystalline powder.
Executive summary:

Terephthalic acid is an organic substance commercially available as a white, free-flowing, crystalline powder. The commercial production process typically results in the formation of rounded crystals. Needles may be formed by slow crystallisation, but may alter flow characteristics.

Description of key information

Terephthalic acid is an organic substance commercially available as a white, free-flowing, crystalline powder. The commercial production process typically results in the formation of rounded crystals. Needles may be formed by slow crystallisation, but may alter flow characteristics. 

Key value for chemical safety assessment

Physical state at 20°C and 1013 hPa:
solid
Form:
solid: particulate/powder
Colour:
colourless
white

Additional information