Both polyvinyl chloride adhesive (PVC adhesive) and polyvinyl alcohol adhesive (PVA adhesive) are polymers containing a "polyvinyl group" (polyethylene) and are classified as "adhesives." However, they are different products with distinct properties and uses.

1. Components
PVA is a water-soluble synthetic polymer derived from vinyl acetate monomer. PVC, on the other hand, is a thermoplastic polymer derived from vinyl chloride monomer.

2. Principle
PVC adhesive: A solvent-based adhesive made from PVC resin and a strong solvent (such as tetrahydrofuran or cyclohexanone). It is essentially a solvent-based adhesive. During the bonding process, the solvent dissolves the surface of the PVC material, allowing the PVC resin in the adhesive to fuse with the PVC molecules on the adherend. Once the solvent evaporates, a molecular bond is formed.

PVA adhesive: A water-soluble adhesive made from PVA resin and water. Water dissolves the PVA resin, forming a viscous liquid. After application, the water evaporates and the resin hardens into a film, achieving adhesion. No strong solvents are required.

3. Practical Applications
PVC Adhesive:
Widely used for bonding PVC materials, including PVC pipes/fittings, PVC sheets/profiles, and PVC packaging products.
PVA Adhesive:
Adhesive for origami, paper cutting, student use, light bonding of solid wood and fiberboard, temporary fixing of fabric and thread, and everyday DIY projects such as paper crafts.