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VINYL ESTER RESINS

Vinyl Ester Resins

Vinyl esters were developed to combine the advantages of epoxy resins with the better handling/faster cure times typical of polyester resins. They are typically reinforced with glass fibres or, more commonly now, carbon fibres to produce a material which is stronger than polyester resin and more resilient than epoxy. It provides excellent resistance to water, organic solvents and alkalis, but less resistance to acids than polyester.

Vinyl esters are flexible, making them well suited to parts which need to withstand impact and repeated flexing without developing cracks. The surface quality that can be achieved is not as good as with polyesters. The built in-toughness of vinyl esters makes smooth surfaces hard to accomplish, and the double bonded nature creates shrinkage during the curing process. 

Advantages
- Vinyl esters offer mechanical toughness and excellent corrosion resistance 
- Stronger than polyesters
- More resilient than epoxy

Limitations
- More expensive than polyester
- Surface quality is not as good as polyester

Processing technologies
The best processes for producing parts with this material are
- Open moulding
- Resin transfer moulding (RTM)
- Sheet moulding compounds (SMC)

​BFG International designers and engineers choose the optimal process in each  case based on variables such as the client’s tooling budget, dimensional tolerance and physical properties of the parts, and production volume. 

​Technical details*

Tensile strength
 15,000psi
Flexural strength
30,000psi
Density
1.80 grams/cc formulated
Modulus
> 1.5MMpsi
Viscosity
approx. 500 centipoise when cut in styrene
​(the standard monomer)
​*For typical 28% glass reinforcement

About BFG

For over 40 years, BFG has been a global leader and pioneer in composite design, engineering and manufacturing, with over 2,000 people and 15 production facilities worldwide – and a total commitment to quality and innovation.
​
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  • Home
  • PRODUCTS
    • Building Envelopes
    • Building Facades
    • Primary Structural Roofs and Ceilings
    • Domes and Cupolas
    • Suspended Ceilings
    • Shading Elements and Screens
    • Interior Architectural Elements
    • Complex Formwork
    • Specialty Architectural Finishes
  • Projects
  • Materials
    • Introduction to composites >
      • What are composites
      • Fire safety performance
      • LEED certification
      • Sustainability and composites
      • History of composites
      • Famous architectural projects
    • Fiber Reinforced Plastic (FRP) >
      • Introduction to FRP Composites
      • Benefits of FRP composites
      • Materials Systems >
        • Matrix Reinforcements >
          • Aramids
          • Carbon fibre
          • E-Glass
          • S-Glass
        • Resin Systems >
          • Polyester Resins
          • Epoxy Resins
          • Phenolic Resins
          • Vinyl Ester Resins
        • Cores
      • Processing Technologies >
        • Open vs Closed Moulding
        • Contact moulding
        • Spray up
        • Light Resin Transfer Moulding (LRTM)
        • Resin Transfer Moulding (RTM)
        • Press moulding
        • Vacuum bagging
        • Vacuum Forming (Thermoforming)
        • Vacuum infusion
        • Sheet moulding compound (SMC)
      • Tooling and Pattern Making
      • Composites in architecture
    • Glass Reinforced Concrete (GRC) >
      • Introduction to GRC
      • Properties of GRC
      • Benefits of GRC
      • GRC in architecture
    • Ultra High Performance Concrete (UHPC) >
      • Introduction to UHPC
      • Benefits of UHPC
      • UHPC in architecture
  • About
    • About BFG
    • Media >
      • ​Media resources
      • Downloads
    • History
    • Certification
    • Careers
  • BFG GROUP
  • Contact