Product Overview
Related solutions: Explore our pultruded FRP profiles, FRP rebar, pultrusion machines, pultrusion dies.
Our vinyl ester resin hex flange bolts are engineered for demanding industrial applications where traditional metal fasteners fail due to corrosion, electrical conductivity, or weight constraints. These specialized composite fasteners combine high-performance vinyl ester resin with continuous glass fiber reinforcement, delivering good strength and durability in demanding environments. At IncomePultrusion, we utilize advanced pultrusion manufacturing technology to create these precision-engineered fasteners that perform well compared with traditional materials. Key Features:
- Strong corrosion resistance in chemical environments
- Good electrical insulation properties
- Lightweight yet high-strength construction
- Integrated flange design can reduce the need for separate washers
- UV-resistant formulation for outdoor applications
Advanced Material Technology
Vinyl Ester Resin Matrix
Our bolts utilize quality vinyl ester resin, a high-performance thermoset polymer that provides:
- Good resistance to acids, bases, and organic solvents
- Strong mechanical properties compared to standard polyester resins
- Good resistance to environmental stress cracking
- Enhanced durability in marine and chemical environments
Glass Fiber Reinforcement
The reinforcement system consists of multiple layers of high-strength glass fibers arranged for optimal performance:
- Continuous glass roving for maximum tensile strength
- Glass mat layers for impact resistance
- Optimized fiber-to-resin ratio for consistent mechanical properties
- UV-resistant surface veils for weather protection
Our comprehensive range of FRP pultruded profiles demonstrates the versatility and strength achievable through advanced pultrusion technology.
Technical Specifications
| Property | Specification | Test Method |
|---|---|---|
| Available Sizes | M8, M10, M12, M16, M20, M22, M24 | Metric Standard |
| Thread Type | Metric Coarse Thread | ISO 262 |
| Length Range | 25mm – 500mm (Custom available) | Customer Specification |
| Flexural Strength | ≥400 MPa | ASTM D790 |
| Tensile Strength | ≥300 MPa | ASTM D638 |
| Operating Temperature | -40°C to +120°C | Continuous Service |
| Density | 1.8 – 2.0 g/cm³ | ASTM D792 |
| Color Options | Beige, Gray, Black | Standard Colors |
Performance Advantages
Strong Corrosion Resistance
Resistant to chemical attack from many acids, alkalis, salts, and industrial chemicals. Suitable for chemical plants, wastewater treatment facilities, and coastal environments where metal fasteners rapidly deteriorate.
Good Electrical Insulation
Non-conductive properties reduce electrical bridging, making them ideal for electrical enclosures, telecommunications equipment, and sensitive electronic applications.
High Strength-to-Weight Ratio
Delivers comparable strength to steel while being lighter, reducing overall structural load and simplifying installation procedures.
Temperature Stability
Maintains mechanical properties across wide temperature ranges, suitable for both high-temperature industrial processes and cold climate applications.
Primary Applications
Chemical Processing Industry
- Reactor vessels and piping systems
- Process equipment in corrosive environments
- Chemical storage tank assemblies
Marine & Offshore
- Saltwater-exposed structures
- Dock and pier construction
- Offshore platform equipment
Water Treatment Facilities
- Sewage treatment plants
- Water purification systems
- Filtration equipment assemblies
Electrical Infrastructure
- Non-conductive fastening requirements
- Electrical cabinet assemblies
- Power distribution systems
FRP Structural Systems
- Fiberglass grating installations
- Composite structural assemblies
- Architectural FRP applications
Material Comparison
| Property | Vinyl Ester Composite | Stainless Steel | Carbon Steel |
|---|---|---|---|
| Corrosion Resistance | Good | Good | Poor |
| Electrical Insulation | Good | None | None |
| Weight | Lightweight | Heavy | Heavy |
| Chemical Resistance | Good | Limited | Poor |
| Cost Over Lifetime | Good Value | Moderate | High (replacement) |
For detailed insights into different resin types and their comparative properties, explore our comprehensive guide to isophthalic polyester applications, which provides valuable context for understanding advanced resin technologies.
Quality Assurance
Our manufacturing process ensures consistent quality through:
- ISO 9001:2015 certified quality management
- Dimensional inspection
- Regular mechanical property testing
- Chemical resistance validation
- UV resistance verification
Installation Guidelines
Preparation:
- Verify chemical compatibility for your specific environment
- Ensure proper hole sizing (1-2mm larger than bolt diameter)
- Confirm load requirements are within specifications
Installation:
- Apply 40-60% of equivalent steel torque values
- Ensure full flange contact with substrate
- Maintain minimum 1.5x diameter thread engagement
Important: Do not exceed recommended torque values. Over-tightening can damage composite threads.
Available Options
Standard Sizes: M8 through M24 in metric coarse threads Custom Lengths: Available from 25mm to 1000mm Special Threads: BSW, UNC, UNF threads available upon request Color Coding: Custom colors for identification systems
Why Choose Our Vinyl Ester Hex Flange Bolts?
With over 20 years of experience in composite fastener manufacturing, we provide proven solutions for the most demanding applications. Our bolts perform well compared with traditional materials in challenging environments, backed by comprehensive technical support and warranty coverage. Quality Assurance: All products include warranty coverage and ongoing technical support to ensure successful project implementation.
FAQ
What sizes are available?
Metric M5-M36, imperial 3/8″-16 to 1″-8. Standard lengths per DIN 6921/ISO 4162. Custom lengths and thread pitches available for specific applications.
What is the mechanical strength?
Flexural strength 413 MPa, flexural modulus 13.8 GPa. Thread shear strength 1200 lbs (1/2″-13), double shear 1905-12428 kg size-dependent. Exceeds many steel grades.
How much lighter than metal bolts?
70–80% lighter than steel by weight/stainless equivalents while maintaining equivalent clamping force. Reduces structural loads and installation torque requirements .
Is it chemically resistant?
Vinyl ester resin resists acids, alkalis, solvents, saltwater. Suitable for chemical plants, desalination, wastewater, offshore platforms where metal corrodes rapidly.
What is the temperature range?
Continuous -37°C to 93°C (-35°F to 200°F). Self-extinguishing per ASTM D635. Low water absorption (1% 24hr) and CTE 9.5×10⁻⁶ K⁻¹ for dimensional stability.
Is it electrically insulating?
Yes. Dielectric strength 1.58 kV/mm. Non-conductive, non-sparking, EMI shielding. Ideal for electrical substations, power plants, and hazardous locations.
What torque values to use?
Recommended: 3 ft-lbs (3/8″), 8 ft-lbs (1/2″), 12 ft-lbs (5/8″). Max square nut torque 32.6 Nm (19.1mm). Use torque wrench for optimal preload without damage.
Does it meet standards?
ASTM certified, DIN 6921 flange geometry. E-glass reinforced vinyl ester. Compatible with FRP structures, no galvanic corrosion with dissimilar materials.
Technical Support
Our engineering team provides:
- Chemical compatibility consultation
- Load calculation assistance
- Installation guidance
- Application-specific recommendations
- Material certificates and test reports
Contact our technical sales team for detailed specifications, chemical compatibility data, or custom design consultation.
Complete the joint with vinyl ester flanged nuts moulded in the same corrosion-resistant resin.
Request a quote: Need this product for your project? Contact us for a quote — our engineering team can help with specifications, custom sizes, and bulk orders.
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