Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Polymer Name
- Molecular Structure
- [CF2 - CF2] [CF2 - CF - OC3F7]
- Technologies
- Product Families
Features & Benefits
- Labeling Claims
- Materials Features
- Product Characteristics
Duro-Bond PFA is designed for corrosion resistant and high purity applications in the chemical, semiconductor, and transportation industries. PFA is a fully fluorinated thermoplastic resin that is melt flow processible.
PFA resin has physical and chemical properties similar to those of other totally fluorinated polymers such as PTFE, MFA, and FEP. Duro-Bond PFA consists of a layer of PFA laminated onto a fiber knit backing that is readily bonded to steel, concrete, or FRP substrates. Duro-Bond PFA sheet lining is available in thicknesses of 60 mils (1.5 mm) and 90 mils (2.3 mm).
- Chemical Resistance and Other Advantages
Duro-Bond PFA linings provide a broad range of chemical resistance that far exceeds the corrosion protection of other plastic, glass, and high nickel alloy materials. PFA is resistant to virtually all corrosive chemicals and inorganic chemicals, including inorganic bases, oxidizing acids, mineral acids, metal salt solutions, and peroxides. It also exhibits excellent resistance to organic chemicals such as anhydrides, hydrocarbons, functional aromatics, esters, ethers, ketones and most amines.
Applications & Uses
- Applications
- Plastics & Elastomers End Uses
- Uses
Duro-Bond PFA lined equipment is used in many ultra-high purity applications in the semiconductor, pharmaceutical, and chemical industries. The outstanding corrosion protection provided by Duro-Bond PFA broadens equipment service capabilities and extends its useful life. Its superior chemical resistance, together with its excellent adhesive bonding characteristics, makes Duro-Bond PFA a high performance lining material for almost any corrosive or high purity application.
- Application
The method of application is as follows:
1. The surface to be lined is properly cleaned and grit blasted to a white metal finish to provide a suitable surface for bonding. (See Electro Chemical Technical Bulletin #1, “Specification for Welded Steel Tanks, Stacks, Ducts or Other Fabricated Equipment for Protective Linings and/or Coatings”.)
2. The Duro-Bond PFA laminate is cut into panels to cover the entire area to be lined with a minimum amount of joints to be welded.
3. The panels are then cemented into position and the seams welded with PFA rod and PFA cap strip using a thermoplastic welding gun.
4. Suitable ventilation and respiration equipment must be used while working with this material.
- Method of Testing
- All lined surfaces are visually inspected for surface defects. Any special dimensional tolerances required after lining are also checked.
- All lined areas are then spark tested for pinhole leaks using a dielectric spark tester adjusted to 10,000 volts. The tester is moved constantly and quickly over the lining surface to prevent a burn through.
- Repair Procedure
Duro-Bond PFA sheet lining can be shop or field repaired. The repairs to defective or damaged areas in the sheet lining are accomplished by cutting out the faulty area, grinding or grit blasting the substrate surface, preparing a piece of sheet of the same dimension, cementing it into position and subsequently welding the joints as described under Application. The repaired area is then inspected and spark tested to insure lining integrity.
Properties
- Color
- Physical Form
- Physical Properties
| Value | Units | Test Method / Conditions | |
| Chemical Characterization | Thermoplastic fluoroCarbon polymer | - | - |
| Melting point | 300-310 | °C | - |
| Upper Service Temperature | 260.0 | °C | - |
| Density (23°C) | 2.15 | g/cm3 | - |
| Tensile Strength | 24-30 | N/mm2 | - |
| Elongation at Break | 300.0 | % | - |
| Solubility in water | Insoluble | - | - |
| Hardness Durometer | D 55 | - | - |
| Water Absorption | max. 0.03 | - | - |
| Oxygen Index | min. 95 | % | - |
| Flammability | V-0 | - | - |
| Thermal Expansion Coefficient 23 -150°C | 16 x 10-5 | mm/mm/°C | - |
Technical Details & Test Data
- Service Temperature
PFA fluorocarbon resins withstand temperatures as high as 260°C (500°F). When adhesively bonded to a substrate, the maximum recommended service temperature for Duro-Bond PFA sheet lining is 110°C (230°F) on a continuous basis, 120°C (250°F) on an intermittent basis.
Safety & Health
- Hazards
- Thermal decomposition - PFA starts to decompose at 260°C
- Hazardous decomposition products - Gaseous fluorinated hydrocarbons (fluoro-olefins, carbonyl fluoride and hydrogen fluoride). Scrap PFA must not be incinerated.
- Hazardous reactions - Traces of COF2 are evident at around 350°C.
- Transportation classifications - PFA is not classified as a hazardous material. No special precautions or procedures need be followed to transport PFA resin or sheet lining.
- Safety Issues
PFA resins are nonvolatile and safe at normal room temperatures. Good safety practice requires the use of adequate ventilation and respirators when processing PFA. Heating PFA may produce fumes and gasses that are irritating or toxic. Care must be taken to avoid contamination of smoking tobacco or cigarettes.