How do you etch PTFE?
Etching is performed by placing the PTFE in a sodium solution, like the commonly used Tetra Etch. The resulting chemical reaction with the surface removes fluorine molecules from the carbon-fluorine backbone of the fluoropolymer leaving carbon atoms that are deficient in electrons.
What is F C ratio?
• F/C Ratio- the ratio of fluorine to carbon etching. species.
Is PTFE low surface energy?
PTFE, or polytetrafluoroethylene, has very low surface energy so it is very difficult to glue to and solvents do not wet to it. Plasma processing of PTFE materials can increase the surface energy, which will lead to covalent bonding and fluid wetting.
What is the surface energy of Teflon?
That’s why water (surface tension = 72 dyn/cm) will wet-out an aluminum pan (surface energy = 840 dyn/cm), but it will bead-up on a PTFE non-stick pan (surface energy = 18 dyn/cm). …
Can you glue PTFE?
Permabond POP Primer and cyanoacrylate adhesive combination work well on PTFE. This is a two-component 1:1 mix ratio structural acrylic which can be applied, without primer, to untreated PTFE surfaces and achieve a reasonable bond strength on this non-stick nasty!
How do I bond PTFE to metal?
To bond Teflon to steel; to bond Teflon to aluminum; to bond Teflon to metal
- Rough the surface of Teflon with sandpaper or steel wool.
- Sand the steel, aluminum or metal first with a coarse grade of sand paper.
- Then sand the steel, aluminum or and the metal with a low-grit (400 or 600) coarse sand paper.
Is RIE anisotropic or isotropic?
RIE is based on a combination of chemical and physical etching which allows isotropic and anisotropic (uni-directional) material removal.
What does plasma etching do?
Plasma etching is used to ‘roughen’ a surface, on the microscopic scale. The surface of the component is usually etched with a reactive process gas which gives both a chemical and physical effect on the surface.
What is sodium etching?
Sodium etching of fluoropolymers has been used for decades to enhance bondability of PTFE. It is performed by immersion of the PTFE in a solution containing sodium followed by rinsing in alcohol and water. The process was originally performed by dissolving sodium metal in liquid ammonia.
What is the surface energy of water?
Surface tension is typically measured in dynes/cm, the force in dynes required to break a film of length 1 cm. Equivalently, it can be stated as surface energy in ergs per square centimeter. Water at 20°C has a surface tension of 72.8 dynes/cm compared to 22.3 for ethyl alcohol and 465 for mercury.
What is high surface energy plastic?
A high surface energy (HSE) means a strong molecular attraction, therefore easier to bond, whereas a low surface energy (LSE) means a weak molecular attraction, therefore harder to bond. When selecting your adhesive, the bonding surface and its surface energy is a vital consideration.
How do you calculate surface energy?
The most common way to calculate the surface free energy is through contact angle measurements. Pure liquids with the known surface tension are used for the measurements. Surface free energy is most typically measured through sessile drop measurements but the force tensiometer can be used as well.
What kind of chemicals can you use with PTFE?
PTFE Chemical Compatibility Chart: Polytetrafluoroethylene is very non-reactive and ideal for use with most chemicals. Review the chemical compatibility of Teflon® and PTFE with various chemicals, solvents, alcohols and other products in the cart below. Shop PTFE
What is the melting point of Teflon PTFE 1?
Highly resistant to most acids, alcohols, detergents and solvents Ideal for use with reactive and corrosive chemicals The melting point of PTFE 1 is 600°K (327°C / 620°F) Low temperature: maintains high strength, toughness and self-lubrication as low as 5°K (-268°C /-450°F) and good flexibility at 194°K (-79°C / -110°F)
What causes Teflon to fail a chemical test?
N/A = Information not available. CAUTION: Variations in chemical behavior during handling due to factors such as temperature, pressure, and concentrations can cause equipment to fail, even though it passed an initial test. *Teflon® is a registered trademark of DuPont.
What’s the difference between D and N / a Teflon?
D = Severe Effect, not recommended for ANY use. N/A = Information not available. CAUTION: Variations in chemical behavior during handling due to factors such as temperature, pressure, and concentrations can cause equipment to fail, even though it passed an initial test. *Teflon® is a registered trademark of DuPont.