Bostik Seal 'N' Flex® 1

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Price Per Unit: $308.20

Price Per Box: $277.38

Bostik Seal 'N' Flex 1 is a high-performance polyurethane sealant designed for demanding construction joints. It offers exceptional flexibility, accommodating movement up to 100%. This sealant is acoustic-rated, paintable, and available in 12 colours, making it a versatile choice for trade professionals.
Vendor: Bostik
Availability: In Stock

Physical Properties

Viscosity: Non-sag smooth thixotropic paste
Cure method: Moisture curing
Chemical resistance: Dilute acids, alkalis, some solvents, intermittent petroleum and diesel contact
Application temperature: 5°c to 35°c
Service temperature: -40°c to 75°c
Tack free time: 6 to 12 hours
Cure rate: 2mm/24 hours on porous substrates
Full cure: 7 days on porous substrates, 14 days in joints over 20mm wide
Specific gravity: 1.25g/ml
Shore a hardness: 30
Tensile strength: 1.3n/mm²
Elongation at break: > 900%
Total joint movement: ± 50%
Maximum joint width: Up to 50mm
Voc: 74g/l
Packaging: ["300ml cartridge, 20 cartridges per carton", "600ml sausage, 20 sausages per carton"]
Standards: ["csiro rilem long - term sealant durability study dbce doc.97/196 (m)", "din 18540 (german)", "sjnf (french)", "as 4020 potable water", "astm c.920-87 & 98 (usa)", "as 1157-1972 resistance to fungal growth"]

Shipping & Delivery

$15.95 shipping on all orders nationwide for most products

Bostik Seal 'N' Flex® 1

Vendor: Bostik

Bostik Seal 'N' Flex® 1


Vendor: Bostik

Bostik Seal 'N' Flex® 1

Colours: Black
Size: 300ml Cartridge
Package Type: Box Buy (20)

Please note, this product is available for BOX BUY only.

Bostik Seal 'N' Flex 1 is a low-modulus, one-component polyurethane sealant designed for exceptional flexibility in construction joints. It boasts a remarkable 100% (±50%) movement capability, making it ideal for dynamic joints prone to expansion and contraction. This Australian-made sealant is also acoustic-rated, non-staining, and paintable, providing a versatile and durable solution for a variety of projects.

Key Features

  • Low modulus for high flexibility
  • ±50% joint movement capability
  • Excellent durability
  • One component, no mixing required
  • Acoustic rated
  • Non-staining
  • Paintable*
  • Available in 12 popular colours
  • Made in Australia


  • In-situ concrete and render
  • Precast and tilt-up panels
  • Brickwork and blockwork
  • Plasterboard face and paper lined recessed edges
  • Fibre cement sheet
  • Aluminium windows
  • Granite, sandstone, and marble
  • GRC, Fibreglass, and most other speciality panel systems


  • Accommodates significant movement in joints
  • Long-lasting performance and weather resistance
  • Reduces noise transmission
  • Easy application with cartridge or sausage gun
  • Can be painted to match surrounding surfaces
  • Wide range of colour options

Application Guide

  1. Ensure surfaces are clean, dry, and free from contaminants.
  2. Prime all surfaces with recommended Bostik primer (refer to specific primer TDS).
  3. Apply sealant using a caulking gun, ensuring proper joint filling.
  4. Tool the sealant before it skins for a smooth finish.


  • Not recommended for use in chlorinated water, on bitumen-containing materials, or in constant immersion in saltwater.
  • Not suitable for glazing applications or trafficable joints.
  • Do not apply below 5°C or above 35°C.
  • Avoid exposure to water and/or alcohol before complete curing.
  • Do not use wet tooling techniques.
  • Minimum joint width 5mm, minimum joint depth 6mm.
  • Maximum joint width 50mm.

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