What is PVAC (UWH)?

Polymer vinyl acetate is also called polyvinyl acetate, vinyl acetate resin or vinyl acetate resin. Amorphous polymer obtained by polymerizing vinyl acetate. It is a thermoplastic resin. Molecular weight is 20,000 to 200,000. Depending on the polymerization method, colorless latex or colorless transparent bead-like solid can be obtained. Solid relative density 1.19 ； Refractive index 1.47 ； Glass transition temperature 28～40℃ ； Tensile strength 34MPa ； Dielectric constant (103Hz)1.15 ； Water absorption 2% ~ 5%. Soluble in aromatic hydrocarbons, homologs, alcohols, esters and chloroform. Strong adhesion, resistant to dilute acid and dilute alkali. Stable in sunlight and temperature of 125℃. Decomposes when encountering concentrated alkali and acid. It is initiated by free radicals from vinyl acetate and can be produced by emulsion, suspension, bulk and solution polymerization methods. Mainly used as coatings, adhesives, paper, chewing gum bases and fabric finishing agents. It can also be used as raw material for polyvinyl alcohol and polyvinyl acetal.

You're right, PVAc is polyvinyl acetate. Its application in unsaturated polyester resin can reduce the shrinkage of UPR and even achieve zero shrinkage, but the disadvantage is that it is difficult to color.

Polymer vinyl acetate polyvinyl acetate, PVAc UWH Is UHMW a typo? ,UHMW means Ultrahigh molecular weight.