PTFE Disks are composed of Polytetrafluoroethylene (PTFE), a high-performance fluoropolymer with the chemical formula PTFE. This material is renowned for its exceptional chemical resistance, thermal stability, and non-reactivity, making it ideal for demanding industrial and laboratory applications. PTFE's unique molecular structure of carbon and fluorine atoms provides unparalleled inertness, though it has specific vulnerabilities under extreme conditions.
Key Points Explained:
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Chemical Composition of PTFE Disk
- Chemical Formula: PTFE (Polytetrafluoroethylene), represented as (C₂F₄)ₙ in its polymerized form.
- CAS Number: 9002-84-0, a unique identifier for chemical substances.
- Molecular Structure: Composed of carbon (C) and fluorine (F) atoms arranged in a linear chain, creating a robust, non-polar backbone.
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Material Properties
- Chemical Resistance: PTFE is inert to most solvents, acids, and bases, but decomposes when exposed to molten alkali metals (e.g., sodium, potassium), gaseous fluorine, or halogenated compounds like chlorine trifluoride (ClF₃).
- Thermal Stability: Withstands temperatures up to 260°C (500°F) continuously but decomposes at ~400°C, releasing toxic gases.
- Physical Traits: Non-flammable, water-repellent, and low-friction, often used as a lubricant or corrosion-resistant coating.
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Applications and Limitations
- Common Uses: PTFE disks serve as liners, seals, or bearings in chemical processing, leveraging their lubricity and compressive strength when combined with fabrics.
- Key Weaknesses: Degrades under extreme conditions (e.g., high-pressure fluorine or elevated temperatures), limiting use in certain environments.
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Safety Considerations
- Decomposition Risks: Heating beyond 400°C releases hazardous fumes, necessitating proper ventilation.
- Incompatible Chemicals: Avoid contact with alkali metals and aggressive fluorochemicals to prevent material failure.
PTFE’s blend of durability and versatility makes it a cornerstone in industries where chemical inertness is critical, though users must heed its operational boundaries.
Summary Table:
| Property | Details |
|---|---|
| Chemical Formula | (C₂F₄)ₙ (Polytetrafluoroethylene) |
| CAS Number | 9002-84-0 |
| Thermal Stability | Up to 260°C (500°F) continuously; decomposes at ~400°C |
| Chemical Resistance | Inert to most solvents/acids/bases; avoid alkali metals & halogenated compounds |
| Key Applications | Seals, liners, bearings in chemical processing & high-purity environments |
| Safety Notes | Decomposes above 400°C, releasing toxic fumes; ensure proper ventilation |
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