West System 209 Extra Slow Hardener

Extended Open Time Epoxy Hardener for Hot Climate Applications

West System 209 Extra Slow Hardener (WS209ESH) is a specialised epoxy curing agent designed to provide maximum working time when used with West System 105 Epoxy Resin.
Formulated for high-temperature conditions and large-scale laminating projects, 209 Extra Slow Hardener offers significantly extended open time, allowing precise positioning, thorough fibre wet-out and complex lay-ups without premature setting. This makes it ideal for marine construction, timber bonding and composite fabrication in warm Australian climates. When mixed at the recommended ratio with 105 Resin, it produces a strong, moisture-resistant epoxy system with excellent durability and structural integrity. Compared to fast or standard slow hardeners, 209 Extra Slow reduces exotherm in large batches and supports improved laminate consolidation. Trusted by professional boat builders and fabricators, it delivers reliable performance where extended working time is essential.

Features & Benefits

Key Features

• Extra slow cure epoxy hardener
• Designed for West System 105 Resin
• Extended open and working time
• High-strength structural performance
• Suitable for warm climate applications

Key Benefits

• Allows maximum time for complex laminations
• Reduces heat build-up in large mixes
• Improves fibre wet-out and consolidation
• Provides durable, moisture-resistant bonds
• Ideal for large marine and composite projects
  
  

Technical Specs

• Product Type: Epoxy hardener – Part B
• System: West System 209 Extra Slow
• Compatibility: West System 105 Resin
• Mix Ratio: As specified by manufacturer
• Product Code: WS209ESH
  
  

Key Applications

• Large marine laminations
• Boat building in warm climates
• Composite structural fabrication
• Timber bonding and joinery
• Industrial assembly requiring extended open time
  
  

West System 209 Extra Slow Hardener (WS209ESH) FAQs

Q1: What is West System 209 Extra Slow Hardener (WS209ESH) used for?
A: It is used with West System 105 Resin to create an epoxy system with extended working time.

Q2: How does 209 Extra Slow differ from 206 Slow?
A: It provides even longer open time, making it ideal for hot climates and large laminations.

Q3: Can this hardener be used on its own?
A: No, it must be mixed with West System 105 Resin to cure properly.

Q4: Is this suitable for marine applications?
A: Yes, it is widely used in boat building and marine structural work.

Q5: Does it maintain structural strength?
A: Yes, when mixed correctly it produces a strong, moisture-resistant epoxy bond.

Downloads

• Safety Data Sheet (SDS)