La-Co Slic-Tite Thread Sealant Paste PTFE — 1/2 pt Jar with Brush‑in‑Cap, White, -50°F to 500°F, High‑Pressure

La-Co Slic-Tite 42019 is a PTFE‑reinforced thread sealant paste sold in a 1/2 pint jar with a brush‑in‑cap, formulated to seal metal and plastic pipe threads across a wide temperature and pressure range.

Built for plumbing, HVAC, refrigeration, and industrial service work, this white paste combines a thick carrier with PTFE solids to improve lubrication and sealing on tapered threads. It is compatible with many common materials — including metal, PVC, CPVC, and ABS — and is labeled for service with water, air, steam, natural gas, certain refrigerants, and various fuels. The jar includes a brush in the cap so technicians can apply the paste neatly and control coverage for better joint assembly.

How does Slic-Tite perform across temperatures and pressures?

Slic-Tite withstands a broad service range from -50°F to 500°F and is engineered for high‑pressure systems where reliable sealing is required. It’s rated differently for gas and liquid systems to reflect operational safety margins and material behavior under pressure.

• Temperature range: -50°F to 500°F (-45°C to 260°C)
• Gas pressure rating: up to 3,000 psi (204 bar)
• Liquid pressure rating: up to 10,000 psi (680 bar)
• PTFE solids add lubricity to help threads tighten evenly without binding

Which pipe types and media can I use it with?

This paste is formulated for use on taper‑type threads such as NPT, BSPT (BS 21), and Australian RC/R styles, and it adheres to both metal and common plastic thread materials. It is suitable for a wide range of fluids and gases used in commercial and industrial systems.

• Compatible materials: steel, brass, PVC, CPVC, ABS
• Approved media: water, air, steam, natural gas, LP gas, refrigerants, ammonia, gasoline, ethanol, oil
• Recommended for tapered threads, not intended as a seal for flanges or gasket surfaces
• Follow local codes for specific fuel and gas installations

How should I apply Slic-Tite to get a reliable seal?

Apply a liberal coat so the paste is at least twice the depth of the thread root; this ensures enough material is transferred into the joint for an effective seal. Use the brush in the cap for even coverage, wipe excess, assemble fittings to recommended torque, and avoid contaminating sealed surfaces with dirt or solvents.

• Coat threads to twice the depth of the thread root for proper fill
• Use included brush to apply evenly and reduce mess
• Assemble per manufacturer torque specs; wipe off excess paste
• Pastes remove from skin and clothing with soap and water

What approvals or certifications does it carry and why they matter?

Slic-Tite has a history of industry acceptance and carries approvals that help meet jobsite and code requirements for many industrial and commercial installations. These qualifications signal suitability for specific systems and give installers confidence to use the product where standards are required.

• Industry approvals support use in gas, liquid, and steam systems
• Compliance simplifies specification for contractors and engineers
• Longevity in the field demonstrates durability and performance
• Check local codes for required certified materials in regulated systems

Who is this for: La-Co Slic-Tite 42019 is designed for plumbers, HVAC and refrigeration technicians, industrial maintenance crews, and professional contractors who need a dependable, PTFE‑enhanced thread sealant. It suits applications that demand high pressure or temperature resistance and where clean, controlled application is important. If you need a ready‑to‑use paste that washes off skin and clothing and works across metal and common plastic threads, Slic‑Tite is a practical choice for routine and specialty sealing jobs.