PVDC
Polyvinylidene Chloride (Saran)
Glass Transition (Tg)
-18 °C
Melting Point (Tm)
198–205 °C
Density
1.60–1.70 g/cm³
CAS Number
9002-85-1
Recycling Code
♺ 7
Category
Functional & Smart
Repeat Unit
–[CH₂–CCl₂]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
Among the best oxygen and moisture barriers of all polymers due to tight crystalline packing; narrow processing window with HCl release on overheating.
Applications
Barrier layers in food packaging, cling film, coatings.