PVDF has a high molecular weight, high melting point and viscosity, good thermal and chemical stability, and superior mechanical properties and adhesion. However, its dispersion is relatively difficult, its adhesion is insufficient, and its fluidity is relatively low.
PVDF with low molecular weight, on the other hand, has the opposite effect. An increase in molecular weight within a certain range contributes to the improvement of adhesion and cohesion. The narrower the distribution of molecular weight, the more uniform the performance of the binder, and the better the overall performance of the material.
 

PTFE has a high molecular weight: the molecular chain is long and highly regular, endowing the material with extremely high chemical stability, high temperature resistance, and low friction coefficient. However, the melt viscosity is extremely high (almost non flowing), making it difficult to be processed through conventional thermoplastic processing (requiring cold pressing sintering).
Low molecular weight PTFE: slightly better processability (such as micro powder PTFE can be used as a lubricant additive), but reduced mechanical strength and creep resistance.
PTFE has extremely high crystallinity (usually>90%), with tightly arranged molecular chains in a spiral shape, forming a highly ordered crystal structure that gives it excellent chemical corrosion resistance. It can be used as a high rigidity component, high-temperature corrosion-resistant seal, and insulation material
PTFE has a very high crystallinity, high hardness and brittleness, and low impact resistance. However, the crystallization rate of PTFE can be reduced by rapid cooling. Low crystallinity melts have good flowability, are easy to heat process, suitable for complex shapes, have low processing difficulty, maintain flexibility at low temperatures, flexible sealing, coating pretreatment, and low-temperature devices

PTFE does not have a clear melting point, and its mechanical properties disappear at 327 °C. It begins to decompose at 400 °C. PTFE is one of the highest temperature resistant fluoroplastics and has excellent high-temperature stability (long-term use temperature of 260 °C, short-term use temperature of 300 °C).
PTFE has a very large working temperature range of -180 °C-260 °C, which can maintain good flexibility at low temperatures and still maintain good performance at high temperatures, making it suitable for extreme temperature alternating environments.
Surface sodium etched PTFE
PTFE plate
PTFE rod
PTFE powder
 

PFA has similar performance to PTFE, with the same working temperature, similar corrosion resistance, and slightly higher friction coefficient than PTFE

High molecular weight PFA: With high melt strength, it is suitable for extrusion molding (such as pipes and films), but its melt viscosity is still significantly lower than PTFE. It has better processability and is suitable for complex injection molding (such as valve components), but its long-term stress cracking resistance decreases.
PFA has a moderate crystallinity (30% -60%), combining the chemical resistance of PTFE with the ease of processing of thermoplastic plastics. Its transparency is superior to PTFE, and its fatigue resistance is even better
Like PTFE, the crystallinity can be adjusted by cooling rate to balance hardness and toughness (such as rapid quenching to reduce crystallinity and improve impact resistance).
PFA has a melting point of about 305-310°C, slightly lower than PTFE, and a glass transition temperature (Tg) of about 30°C. Its molecular chain flexibility is between PTFE and FEP, making it suitable for materials that require moderate flexibility.