The base/solvent in PVC cement is generally a combination of:
Tetrahydrofuran (THF) CAS 109-99-9 45-60%
Cyclohexanone CAS 108-94-1 9-18%
Acetone CAS 67-64-1 3-11%
The solvents are available in bulk at industrial chemical supply stores. The exact mixture is dependent on how "hot/cold" the mix is. Before it hardens, you can thin the cement with solvent(s) to reactivate it but if you aren't comfortable working with solvents/chemistry its best to just buy another can. Usually PVC cement is good for about 3 years but check the date stamp on the can before buying it. The "use by/before" date is important.
Chum lee
