Due to supply chain shenanigans, I'm having to consider purchasing a batch of VP/VA copolymer that expired in September 2022. It is still in the manufacturer's original packaging and the seal has not been clubbed or otherwise broken.
The ingredient is being used to provide hold in hair-styling products.
I've asked the supplier if their QC team can test if the batch is still within specification, and I'm now trying to gauge the risk of the material failing afterwards.
CIR report that it does not absorb in the UV/Vis range, so I am inclined to believe (or perhaps am recklessly hopeful) that it should be stable provided it is stored sealed tight, dark and dry (keep it clean).
How stable do you believe polyvinylpyrrolidone/vinyl acetate copolymer is?
All opinions and risk assessments welcome!