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Description of key information

Value used for CSA:

Half-life for hydrolysis: 50 to < 60 d at 25 °C (pH 7)

Key value for chemical safety assessment

Additional information

An experiment was performed to determine (i) the rate of hydrolysis of the UVCB PETIA as a function of pH and (ii) the identity or natures and rates of formation and decline of hydrolysis products to which organisms may be exposed(Boutreau, 2010). Hydrolysis was followed as the disappearance of one of the main constituents, pentaerythritol tetraacrylate (PETRA). The constituent pentaerythritol triacrylate (PETIA) is a breakdown product of PETRA and therefore also covered by the analysis. The more complex constituents (e.g. adducts) cannot be isolated and therefore analytical standards do not exist to allow their monitoring in a hydrolysis study. The results indicate:

-         No or less than 10% hydrolysis at pH 4 (t0.5> 1 year at 25°C)

-         Hydrolysis at pH 7 (50 < t0.5< 60 d at 25°C)

-         Hydrolysis at pH 9 (t0.5= 7 hours 50 min at 25°C) leads to the formation of five breakdown products:

o   pentaerythritol triacrylate (MW = 298 g/mol; C14H18O7)

o   pentaerythritol diacrylate (MW = 244 g/mol; C11H16O6)

o   pentaerythritol monoacrylate (MW = 190 g/mol; C8H14O5)

o   acrylic acid (MW = 72 g/mol; C3H4O2)

o   pentaerythritol (MW = 136 g/mol; C5H12O4)

- Hydrolysis is quicker at higher temperatures