02/12/2025
Thread sealants are materials used to fill the microscopic gaps in threaded pipe connections, ensuring a leak-proof and pressure-tight seal for gases, liquids, and air.
Main Types of Thread Sealants
* PTFE Tape (Teflon Tape / Plumber's Tape): A thin, non-adhesive film, usually made of polytetrafluoroethylene (PTFE).
* Form: Tape, color-coded for different applications (white for water, yellow for gas, green for oxygen).
* Material: Chemically inert PTFE, which lubricates threads for easier assembly.
* Application: Works well for small-diameter threads (up to 1-1/2 inches) and on all pipe materials (metal and plastic). It is clean and easy to apply but can shred if the joint is readjusted after tightening.
* Pipe Joint Compound (Pipe Dope / Thread Paste): A paste-like material applied with a brush or squeezed from a tube.
* Form: Paste or thick liquid. Some are solvent-based (harden as the solvent evaporates, prone to shrinking/cracking over time) while others are non-solvent. Many modern versions contain PTFE for improved performance.
* Material: Various compositions, often containing PTFE, graphite, ceramic microspheres, or lead/zinc compounds.
* Application: Effective for gas lines, stainless steel, and larger/wider threads, as its thickness fills gaps effectively. It provides good lubrication for tightening and is easy to apply.
* Anaerobic Sealants (Anaerobic Resin Compounds / Liquid Thread Sealant with PTFE): High-performance, professional-grade sealants.
* Form: Liquid or gel/paste-like viscosity. They are typically methacrylate esters.
* Material: 100% solids formulation, often containing PTFE for lubrication.
* Application: Designed for metal-to-metal threaded connections (not suitable for most plastics). They cure in the absence of air and in the presence of metal ions, forming a durable, vibration-resistant, solid seal that won't shrink or crack. They are ideal for high-pressure, high-temperature applications and permanent fixtures.
Anaerobic Grease vs. Liquid
The terms "grease" and "liquid" primarily refer to the viscosity or texture of the sealant, rather than a fundamental difference in chemical composition (which is typically anaerobic resin for both).
* Liquid Anaerobic Sealants: More fluid, designed to pe*****te and fill the fine gaps of small, tightly-fitted threads.
* Anaerobic Gels/Pastes (sometimes referred to loosely as "grease" in general use for their texture): Thicker, paste-like materials used for larger or coarser threads, where more material is needed to bridge larger gaps between threads.
Both forms cure using the same anaerobic process and offer similar benefits, such as resistance to chemicals and vibration. The choice between a more liquid or paste version depends on the specific thread size and application requirements, with the general rule being that thinner sealants are for finer threads and thicker pastes for coarser ones.
All Types of sealant materials are available in SANFIX
