Description
Loxon® 1K Smooth Polyurethane Sealants are a versatile, durable, one component sealant line. They have a non-sag, gun grade, formulat that is paintable after full cure. The Loxon 1K Smooth Polyurethane Sealants are flexible, resilient and rubber-like in appearance which enables them to adhere to a variety of substrates. A must have tool for any professional because they reisist deterioration due to extreme weather, stress movement, water and many chemicals.
Material Use
Loxon S1 is a high-performance, one-component, moisture-curing, non-sag polyurethane elastomeric sealant formulated for sealing and caulking joints subject to structural movement. It provides a flexible, resilient, rubber-like finish and is VOC compliant in all 50 U.S. states.
System Components
- Primary Sealant: Loxon S1
- Primer (for porous substrates or immersion use): Loxon Quick Dry Primer (SUPRIQD13)
- Backer Rod: Closed-cell polyethylene foam recommended for proper joint depth control.
- Bond Breaker: Polyethylene strip where backer rod is unsuitable.
Applications
Loxon S1 is ideal for a wide variety of sealing tasks, including:
- Expansion joints (interior/exterior, above/below grade)
- Aluminum, wood, and vinyl window frames
- Skylights and door frames
- Foundations, precast units, store fronts
- Roofing, fascia, parapets, and curtain walls
- Cementitious board, concrete, masonry, stone, vinyl, glass, metal, and ceramic
Application Details
Surface Prep
- Surfaces must be dry, clean, and structurally sound.
- Old sealant should be removed. All surfaces must be free of dust, oil, wax, corrosion, and loose material.
- Porous substrates and metal such as stainless steel or galvanized steel may require priming with Loxon Quick Dry Primer.
- Mill finish aluminum should be cleaned with solvent before application.
Joint Design
- Min Joint Width: ¼”
- Max Joint Width: 1½”
- Max Depth: ½”
- Typical Bead Size: ¼" depth for ¼" width; ½ the width depth for larger joints
Application Method
- Professional-grade caulking gun with positive pressure.
- Sealant must be dry tooled; do not use water/solvent-based tooling.
- Use masking for neat application; remove immediately after tooling.
Painting
- Acceptable after full cure (approximately 7 days depending on RH).
- Use only breathable coatings after 48 hours and non-breathable after 72 hours at 75°F/50% RH.
Performance and Limitations
Curing
- Skins in <24 hrs at 75°F/50% RH.
- Full cure approx. one week; 21 days required for immersion use.
- Pot life is not applicable (one-component sealant).
Movement and Elasticity
- Joint Movement: ±35%
- Elongation: 800%
- Tensile Strength: 350 psi
- Hardness: Shore A 27±2
Environmental Limits
- Application Temp Range: ≥ -40°F to ≤ 180°F (after cure)
- Can be applied below freezing if surfaces are dry and clean.
- Not suitable for:
- Continuous water immersion without primer and cure
- Horizontal joints under heavy wear
- Narrow/fillet joints and face nails
- High UV exposure on glass bond (will yellow)
- Glazing applications or contact with silicone sealants
Coverage and Thickness
Bead Coverage (per 10.1 fl oz cartridge):
According to the table on page 4, a ¼” x ¼” bead covers approx. 24 lineal feet. Larger bead sizes reduce coverage accordingly.
Special Notes
- GREENGUARD Gold Certified for low indoor emissions.
- Not compatible with oxime-cured silicone sealants.
- Store at room temperature; 12-month shelf life.
- Cure may be extended in cold, dry, or confined conditions.
- For immersion (up to 122°F water): must use primer and 21-day cure required.
- UV exposure causes surface yellowing but does not affect performance when properly installed.
https://www.sherwin-williams.com/painting-contractors/products/loxon-s1-one-component-smooth-polyurethane-sealant
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