Halar® (ECTFE) Coating for Corrosion Resistance
Performance
Halar® (ECTFE), a copolymer of ethylene and chlorotrifluoroethylene, is a semi-crystalline melt processable partially fluorinated polymer. It is availible in different grades that are specifically designed for electrostatic powder coating.
Halar® is particularly suitable for use as a coating material in protection and anti-corrosion applications thanks to its unique combination of properties.
Key features
- Very good chemical and thermal resistance
- Optimum permeation resistance
- Outstanding flame resistance
- Very good surface characteristics
- Surface smoothness
- Purity
Applications
Typical applications served by Halar® include those in contact with highly corrosive or ultrapure chemicals such as strong inorganic bases and strong mineral and oxidizing acids including:
- Vessels
- Reactors
- Semiconductor chemical storage tanks and ductwork
- Piping systems
- Centrifuges
- Agitators
- Exhaust hoods
- Filters
- Electroplating equipment
Processing
Halar® is available in different grades that are specifically designed for electrostatic powder coating, fluidized bed coating, or both.
Electrostatic Powder Coating
Generally the procedure involves substrate preparation, spray coating, baking and cooling. Several passes maybe required to obtain the desired Halar® load and build up coating thickness.
| Specification: | Data: |
|---|---|
| Melting Point: | 220-227°C |
| Specific Gravity: | 1.68 |
| Operating Temperature: | -150°C |
| Curing Temperature: | 250-280°C |
| Thermal expansion coefficient: | 8 |
| Flexural Modulus @ 22°C: | 1,700 MPa |
| Tensile Modulus @ 22°C: | 1,700 MPa |
| Yield Stress @22°C: | 32 MPa |
| Tensile Strength at Break @ 22°C: | 48 MPa |
| Hardness Rockwell: | R93-4B kV |
| Hardness Shore: | D75 |
| Impact Strength Notch Izod @ 25°C: | No Break J/m |
| Flammability: | 94 V-O |
| Oxygen Index: | 60% |
| Volume Resistivity: | 1016 ohm.cm |
| Dielectric Constant @ 1 MHz: | 2.5 |
| Dielectric Strength 3 mm thick: | 14.5 kV/mm |
| Dissipation factor @ 1 MHz: | 0.009 |
| Water absorption: | Less than 0.01 |
| Permeability O2 @ 25°C: | 0.2 |
| Permeability N2 @ 25°C: | 0.1 |
| Permeability H2O (vapor) @ 25°C: | 7.5 |
| Permeability HCl 37% @ 50°C: | 0.2 |
| Permeability Methanol @ 50°C: | 0.1 |
| Permeability H2O (liq.) @ 50°C: | 7.5 |
| Low temperature embrit.: | Less than -76°C |