Fosroc Nitoseal PU 40

Product Overview

Nitoseal PU40 is a one-part, low-modulus gun-grade elastomeric sealant based on polyurethane technology. Smooth, non-slumping paste that is easy to apply. Provides good movement accommodation for various building joints. Suitable for joints within a specified width range; moving joints should be designed to an optimum width-to-depth ratio to minimise stress on the sealant.

Features

• Broad adhesion — bonds to most common building materials
• Single component, fast cure — no mixing required, rapid cure rate
• Easy to apply — smooth paste, gun-applied
• UV resistant — suitable for long-term exterior exposure
• Primerless for most applications — generally no primer needed
• Colour range — available in multiple colours
• International standards compliant — ISO 11600, ASTM C920 and others (per manufacturer)

Applications

• Concrete structural joint sealing
• Brickwork and blockwork joint sealing
• Precast concrete panel joints
• Stone cladding joints
• Perimeter sealing around doors and windows
• Non-trafficked floor joints

Application Guidelines

• Surface preparation — joint surfaces must be clean, dry and frost-free; remove dirt, laitance, loose material and rust
• Priming — generally not required; for high-movement or intermittently immersed joints, use Fosroc Primer 7 (porous) or Primer 4 (non-porous)
• Backer rod — use polyethylene foam backer rod in expansion joints; use bond breaker tape in contraction joints
• Application — gun sealant firmly into joint and tool flush shortly after application
• Finishing — mask joint edges before sealing for neat finish lines

Packaging

• 600 ml sachets (10 per box)
• 310 ml cartridges (subject to minimum order quantity)

Notes

• Do not apply at low temperatures
• Not suitable for water-immersed conditions (use Nitoseal MS600)
• Not suitable for contact with bituminous materials
• Not suitable for trafficked floor joints (use Nitoseal MS300)
• May stain decorative stone (use Nitoseal MS100 for non-staining)
• Not suitable for contact with solvents, oil or petrol
• Colour change may occur on exterior exposure but does not affect physical properties
• Shelf life: twelve months in original packaging in cool, dry conditions (per manufacturer)
• For detailed application methods, coverage rates and technical parameters, refer to the official product data sheet

FAQ

How does PU40 differ from the MS sealant series?

PU40 is a polyurethane (PU) sealant suited for general building joint sealing, primerless for most applications. The MS series are modified silicone sealants with specific strengths: MS600 for water-immersed conditions, MS300 for trafficked floor joints, MS100 for non-staining applications on stone. Select the appropriate product based on your requirements.

Is a primer required?

Most general applications do not require a primer. However, for high-movement joints or joints intermittently immersed in water, a primer is recommended for reliable adhesion. Use Fosroc Primer 7 for porous substrates and Primer 4 for non-porous substrates.

How much does it cost?

Please contact us via WhatsApp for pricing. Available for pickup at our Mong Kok store or delivery within Hong Kong.