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How to Properly Use Liquid Thread Sealant (Anaerobic Adhesive)
Usage Steps
I. Surface Preparation (Critical!)
Cleaning: Thoroughly remove oil, grease, dust, and old sealant from threads using a dedicated cleaner (e.g., acetone, isopropanol). Ensure surfaces are absolutely clean and dry (wipe dry with a lint-free cloth).
Rust Removal: If rust is present, remove it with a wire brush or sandpaper until bare metal is exposed.
Avoid Oils: Do not use lubricating oils or WD-40, as they will prevent curing.
II. Application Method
Apply to External Threads: Apply adhesive evenly to the root and middle section of the external threads (approx. 2/3 of the length), avoiding the last 1-2 threads at the end (to prevent squeeze-out into the pipe bore).
Quantity Control: Apply a thin, even film just covering the threads. Excess adhesive slows curing and can cause blockage.
Small Diameter Threads: Apply small dots into the thread grooves; the adhesive will spread during assembly.
III. Component Assembly
Assemble Immediately: Tighten components within 1 minute of application (prevents premature curing).
Tightening force: Tighten according to standard torque to ensure thread alignment and avoid repeated adjustments.
IV. Curing Time
Initial Cure: Surface sets in approx. 10-30 minutes at room temperature (25°C) (varies by product).
Full Cure: Typically requires 24 hours to reach full strength.
Temperature Effect: Curing time doubles for every 10°C drop below 25°C (e.g., requires 48 hours at 15°C).
Large Thread Gaps: If gap > 0.25mm, use a high-viscosity grade or combine with a solid gasket.
V. Cleaning Excess Adhesive
Wipe away external excess adhesive before curing using a lint-free cloth dampened with cleaner. Once cured, excess requires mechanical removal.
Critical Precautions
I. Material Compatibility
Best Results: Active metals (iron, copper, aluminum) do not require primer.
Inert Materials: Stainless steel, hard alloys require primer (apply to mating surface).
Avoid: Pure oxygen systems, plastics (ABS/polycarbonate may crack), elastomers (e.g., rubber gaskets).
II. Temperature & Pressure Limits
Temp Range: -55°C to +150°C (high-temp grades up to 230°C).
Pressure Rating: Typically withstands >50 MPa; verify specific product data during selection.
III. Safe Operation
Ventilation: Use in well-ventilated areas; avoid confined spaces to prevent vapor buildup.
Protection: Wear chemical-resistant gloves (nitrile). Avoid skin contact (wash immediately with soap and water if contacted).
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