What is PVDF
PVDF, or Polyvinylidene Fluoride, is a high-performance polymer belonging to the fluoropolymer family. High molecular weight materials consist of long chains of repeating monomer units formed through polymerization reactions. Many natural materials, such as natural rubber and cotton, as well as synthetic chemical fibers, are composed of polymers.
PVDF is created through the polymerization of vinylidene fluoride monomers. It exhibits excellent chemical stability, heat resistance, mechanical properties, and durability. These attributes make PVDF an ideal material for various applications, including:
- Chemical Industry: Used to manufacture corrosion-resistant pipes and containers.
- Solar Panels and Lithium Batteries: Acts as a binder or coating material.
- Semiconductor Processing Equipment: Utilized due to its durability and resistance to harsh chemicals.
- Medical Devices: Preferred for its stability and biocompatibility.
PVDF Chemical and Physical Properties
PVDF Temperature Resistance and Structure
PVDF plastic has a molecular structure that gives it exceptional chemical stability and resistance to most chemicals and solvents. This makes it an ideal material for pipes and containers used in the chemical industry. PVDF can operate for extended periods in temperatures ranging from -30°C to 150°C, with some special grades capable of withstanding even higher temperatures.
PVDF Mechanical and Thermal Properties
PVDF exhibits outstanding tensile strength and impact resistance, making it suitable for high-durability applications. Its physical properties include:
- PVDF Density: Typically 1.78-1.79 g/cm³
- Temperature Range: Generally from -30°C to 150°C. The melting point of PVDF is around 177°C, which is relatively low compared to other fluoropolymers, making it easy to process and mold.
- Corrosion Resistance: It can withstand all strong acids, bases, oxidizers, reducers, and various organic solvents, except for molten alkali metals, fluorinated media, and molten strong bases.
- Insulation: PVDF's electrical resistance can reach up to 10^18 ohm·cm, with minimal dielectric loss and high breakdown voltage, unaffected by environmental conditions and frequency.
- Self-Lubricating: PVDF has the lowest friction coefficient among plastics, making it an ideal material for oil-free lubrication.
- Non-Stick Surface: No known solid materials can adhere to its surface, making it a solid material with the lowest surface energy.
- Weather Resistance: PVDF maintains its surface and performance even after prolonged exposure to the atmosphere due to its excellent radiation resistance and low permeability.
Chemical resistance chart
» Meaning of symbol:
- OK: Recommended.
- △: Must confirm if usable by testing in advanced.
- X: Not recommended.
- N/A: No relevant data available for reference
» This chart only provides the result of a single chemical to material, if a client uses more than one kind of chemical at the same time, please choose material by experience.
» This chart is for reference only which is not applicable to all working environments. Please refer to design equipment according to practical experience.
| Category |
Name |
PVDF |
Organic acids
|
Acetic acid |
OK (80% @ 80˚C)
△ (80% @ 100˚C)
X (80% @ 120˚C) |
| Acetic acid, glacial |
OK (80˚C)
△ (100˚C)
X (120˚C) |
| Acetic anhydride |
△ (25˚C)
X (50˚C) |
| Citric acid |
OK |
Organic compound
|
Acetaldehyde |
N/A |
| Acetone |
OK (50% @ 25˚C)
△ (100% @ 25˚C)
X (100% @ 50˚C) |
| Methyl alcohol |
N/A |
| Aniline |
OK (80˚C)
△ (100˚C) |
| Benzaldehyde |
OK (25˚C)
△ (50˚C) |
| Benzene |
OK (80˚C)
△ (100˚C) |
| Benzyl alcohol |
OK |
| Benzyl chloride |
OK (100˚C) |
| Corn oil |
OK |
| Ethanol |
OK |
| Ethylene glycol |
OK |
| Fatty acid |
N/A |
| Formaldehyde |
OK (37% @ 80˚C) |
| Formic acid |
OK (20%) |
| Hexane |
OK |
| Lactic acid |
OK (50˚C)
△ (80˚C)
X (100˚C) |
| Methanol |
OK |
| Paraffin oil |
N/A |
| Petroleum |
OK |
| Phenol |
OK (100% @ 65˚C)
△ (100% @ 80˚C) |
| Propane, liq |
OK |
| Propanol |
OK (80˚C)
△ (100˚C) |
| Stearic acid |
OK |
| Tannic acid |
OK (110˚C) |
| Tartaric acid |
N/A |
| Toluene |
OK (80˚C)
△ (100˚C) |
| Urea |
N/A |
Inorganic compound
|
Ammonia |
N/A |
| Ammonium chloride |
OK |
| Ammonium hydroxide |
N/A |
| Ammonium nitrate |
OK |
| Ammonium sulfate |
OK |
| Aqua regia |
N/A |
| Barium chloride |
OK |
| Barium hydroxide |
OK |
| Brine |
N/A |
| Calcium Chloride |
OK |
| Calcium hydroxide |
OK |
| Carbonic acid |
OK |
| Chloric acid |
N/A |
| Chlorine |
OK (100˚C) |
| Detergent |
N/A |
| Hydrobromic acid |
OK (50% @ 100˚C) |
| Hydrochloric acid |
OK (20% @ 100˚C)
△ (35% @ 120˚C) |
| Hydrofluoric acid |
N/A |
| Hydrogen peroxide |
OK (80˚C) |
| Nitric acid |
OK (60% @ 65˚C)
△ (60% @ 80˚C)
X (60% @ 100˚C) |
| Phosphoric acid |
OK (85%) |
| Potassium hydroxide |
OK (80˚C)
△ (100˚C)
X (110˚C) |
| Potassium nitrate |
OK |
| Potassium sulfate |
OK |
| Sodium carbonate |
OK |
| Sodium hydroxide |
OK (10˚C)
X (40˚C) |
| Sodium nitrate |
OK△X |
| Sulfuric acid |
OK |
| Sulfur dioxide |
OK (98% @ 65˚C)
△ (98% @ 80˚C)
X (98% @ 100˚C)
X (fuming) |