432 to 464 °F (decomposes) (NTP, 1992)
sublimes at 210
Sublimes at 210 °C giving a stable form with melting point 258 to 265 °C (dec) and an unstable form with melting point 225 to 230 °C
258 - 265 °C
Boiling Point
SUBLIMES (NTP, 1992)
501.00 °C. @ 760.00 mm Hg
Density
1.7 at 68 °F (USCG, 1999) - Denser than water; will sink
1.69 kg/l at 20 °C
Density = 1.694 g/cu m at 6 °C
Relative density (water = 1): 1.7
Physical Description
Gallic acid is an odorless white solid. Sinks in water. (USCG, 1999)
Dry Powder
Colorless or slightly yellow solid; [Hawley] White hygroscopic solid; [ICSC] White or cream colored powder;
Solid
WHITE HYGROSCOPIC CRYSTALS.
Appearance
Colorless or slightly yellow cyrstalline needles or prisms.
NEEDLES FROM ABSOLUTE METHANOL OR CHLOROFORM
White needles