NP1 Caulk Black – Polyurethane Construction Sealant (10.1 oz Tube)

Sikaflex NP 1 is a premium, one-component polyurethane joint sealant designed for durable seals on interior and exterior projects. It requires no mixing and typically no primer to bond to common substrates like concrete, masonry, metals, and wood. NP 1 delivers non-sag application, excellent weathering resistance, and ±35% movement capability for long-term performance in dynamic joints. In acoustic applications, it helps reduce sound transmission by sealing gaps and perimeters. Skins within 24 hours and cures to a tough, elastomeric seal. Black color, 10.1 fl oz tube.

Key Features:

• One-component, no-mix polyurethane sealant for easy application
• ±35% joint movement capability for durable flexibility
• Skins in 24 hours, full cure in about 1 week
• Excellent adhesion to concrete, masonry, metals, and wood

• Type: One-component, gun-grade, elastomeric polyurethane joint sealant (non-sag)
• Movement Capability: ±35% (ASTM C719)
• Compliance: ASTM C920 Type S, Grade NS, Class 35, Use NT, M, A, T, O*, I (*priming required for immersion)
• Service Temperature: −40 to 180 °F (−40 to 82 °C)
• Hardness (Shore A): 25–30 at standard conditions (max 50 after heat aging)
• Elongation at Break: ~800% (ASTM D412)
• Tear Strength: ~50 pli (ASTM D1004)
• Weathering/Color: Passes ASTM C793/C510
• Acoustic: Sound insulation ~44 dB (ASTM E90)
• Skin/Full Cure: Skins overnight/within 24 hrs; full cure ~1 week; 21 days before immersion service
• Packaging: 300 ml (10.1 fl oz) cartridge
• Color (this item): Black
• Shelf Life (unopened): 15 months (cartridge)
• Notes: UL fire testing references available

• Prepare substrates – clean and dry; remove dust, oil, old sealant, and coatings
• Design the joint – depth about half the width; use backer rod or bond-breaker
• Prime when required – use Sika primers for immersion service or special substrates
• Apply the sealant – load tube into gun, apply evenly, and dry-tool for profile
• Cure – skins in about 24 hrs; full cure in about 1 week; immersion after 21 days
• Clean up – clean tools immediately with solvent; remove cured residue mechanically

Q: What is the movement capability
A: ±35% joint movement (ASTM C719)

Q: How long does it take to cure
A: Skins in 24 hours; full cure in about 1 week; 21 days for immersion

Q: Do I need a primer
A: Usually no, but required for immersion service and certain substrates

Q: What is the service temperature range
A: −40 to 180 °F (−40 to 82 °C)

Q: Can it be painted
A: Rigid paints may not adhere well; test compatibility first

Q: What is the shelf life
A: 15 months unopened (cartridge)