Pentaerythritol tetraacrylate (PETA, sometimes PETTA, PETRA) is an organic compound.

[1] As it is a polymerizable acrylate monomer, it is nearly always supplied with an added polymerisation inhibitor, such as MEHQ (monomethyl ether hydroquinone).

PETA is part of a family of acrylates used in epoxy resin chemistry and ultraviolet cure of coatings.

It is a derivative of pentaerythritol[2] One of the key uses of the material is in polymeric synthesis where it can form micelles and block copolymers.

[5] As the molecule has 4 functional acrylate groups it confers high cross-link density.