PVA / PVOH
Polyvinyl Alcohol
Glass Transition (Tg)
75–85 °C
Melting Point (Tm)
200–230 °C
Density
1.19–1.31 g/cm³
CAS Number
9002-89-5
Recycling Code
♺ 7
Category
Functional & Smart
Repeat Unit
–[CH₂–CH(OH)]ₙ–
The repeating unit is the smallest structural fragment whose repetition builds the whole chain. Subscripts show the relative share of each unit in copolymers.
Key Properties
Cannot be made from its monomer (vinyl alcohol is unstable) — it is produced by hydrolysing PVAc; water solubility is set by the degree of hydrolysis; excellent oxygen barrier when dry.
Applications
Dissolvable laundry pods, 3D-print support material, textile sizing, films.