Permatex Thread Sealant with PTFE, 16 oz Red — Pressure‑Resistant, -65°F to 300°F

Permatex 80633 Thread Sealant with PTFE is a red, general-purpose pipe and fitting sealant formulated to create reliable, pressure-resistant seals in air, oil, diesel fuel and hydraulic systems.

Designed as an affordable, easy-to-apply alternative to tapes and traditional pipe dopes, this 16 oz. tube combines a tacky carrier with PTFE (polytetrafluoroethylene) to improve sealing performance and resistance to common shop fluids. The formula stays pliable from -65°F to 300°F, tolerating a wide span of operating temperatures while maintaining leak protection. Typical uses include air conditioning fittings, temperature sending units and hydraulic connections where a reusable, serviceable joint is required.

How does this sealant perform compared with pipe tape or dope?

Permatex 80633 offers a thicker, more forgiving seal than thin tapes and can fill irregular thread patterns better than some liquid dopes. The embedded PTFE reduces friction for easier thread engagement while helping to prevent leaks under pressure. Because it remains pliable across a broad temperature range, it resists cracking and shrinkage that can compromise seals.

• Outperforms tape and many pipe dopes on uneven or worn threads
• PTFE reduces thread galling and eases assembly
• Temperature range -65°F to 300°F maintains pliability
• Resists common shop fluids like oil and diesel

Is this safe for hydraulic, fuel, and air systems?

This Permatex sealant is formulated for use in hydraulic, air, oil and diesel fuel systems, providing a reliable pressure seal when applied correctly. It resists breakdown from petroleum-based fluids and maintains integrity where vibration and temperature cycling occur. Always verify compatibility for specific fuels or system materials before widespread use.

• Suitable for hydraulic fittings and air conditioning connections
• Resists oil and diesel fuel exposure during service
• Works on standard metal pipe and fitting materials

How should I apply and cure the Permatex 80633 thread sealant?

Clean threads of dirt, oil and old sealant before applying a thin, even coat to male threads; assemble and tighten to the recommended torque. Excess material should be wiped away to avoid contamination of system internals. Cure time depends on joint size and ventilation—small joints set quickly while larger assemblies may require longer to reach full strength.

• Remove contaminants before application for best adhesion
• Apply an even coat to male threads only; wipe excess
• Tighten fittings to manufacturer torque specs
• Allow curing time proportional to joint size and airflow

What environmental and handling details should I know?

The product has a flash point of 24.0°C, so handle and store away from open flames and high heat. Use in well-ventilated areas and follow standard shop safety practices, including gloves and eye protection if contact is likely. Dispose of any waste or used containers according to local regulations.

• Flash point: 24.0°C — store away from ignition sources
• Use ventilation and personal protective equipment as needed
• Follow local rules for disposal of chemical products

Who is this for: Permatex 80633 is aimed at technicians, mechanics and DIY enthusiasts who need a dependable, versatile thread sealant for air, oil, diesel and hydraulic fittings. It’s a practical choice for maintenance shops, HVAC installers, fleet service, and home garages where a robust, temperature-resistant sealant that outperforms tape and many dopes is required. Choose this product when you want an economical, serviceable seal that tolerates a broad range of temperatures and common shop fluids.