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Direct Roving

direct roving

Direct Roving Function

Direct roving possesses excellent tensile strength, making it ideal for applications requiring high load-bearing capacity. Additionally, it exhibits strong resistance to corrosion and thermal degradation, making it suitable for harsh environments. The direct roving is coated with a silane sizing agent and is compatible with various resin systems, including polyester, vinyl ester, and epoxy resins, offering good wet-out properties. It can be used in winding processes, pultrusion processes, LFT, and weaving processes. Direct roving can significantly enhance the mechanical properties of composites, including tensile strength, flexural strength, and impact resistance. It is widely used in industries such as marine, aerospace, construction, and automotive, where high strength, durability, and lightweight composite materials are required.

direct roving 310H

It could work with Electrical insulation rods

direct roving 312

It has Fast and complete penetration features and could work for pultrusion profile.

direct roving 312T

It has excellent mechanical properties and is suitable for sucker rods and high-end pultrusion profiles.

direct roving 316H

It is compatible with matrix resin, has high tensile strength in composite products, and is suitable for optic cables.

direct roving 332

It has good compatibility with polyurethane resin and is suitable for various pultrusion profiles and telegraph poles.

direct roving 386T

It is compatible with matrix resin, has excellent mechanical properties in composite products, and is suitable for various sectional bars and optic cables.

direct roving 386H

It is a soft strand with good compatibility with resin, and is suitable for various sectional bars.

Direct Roving For Filament Winding (6)

  • direct roving 306B

    It has good acid and chemical resistance, suitable for TP high-pressure pipes.

  • direct roving 308

    It is compatible with epoxy resin, designed for filament winding under high tension, and has excellent bursting and fatigue properties for pipeline products. Suitable for high-pressure oil pipes and CNG cylinders.

  • direct roving 308H

    It is compatible with epoxy resin, suitable for high-tension winding and amine curing systems, and has excellent mechanical properties, corrosion resistance, and fatigue properties for pipeline products. Suitable for high-pressure pipelines and pressure vessels.

  • direct roving 308S

    It is compatible with epoxy resin, suitable for acid anhydride curing systems, with very fast penetration speed, good winding processability, excellent mechanical properties, corrosion resistance, and fatigue properties for pipeline products. Suitable for high-pressure pipelines and pressure vessels.

  • direct roving 310S

    It has excellent electrical properties, suitable for hollow composite insulators.

  • direct roving 318

    It is compatible with epoxy resin, has low fuzz, and is designed for filament winding processes under low tension. Suitable for pressure vessels and high and medium pressure FRP water pipes.

Assembled Roving for Spray Up (3)

  • ER13-2400-176

    Good runnability for spraying operation, larger dispersion area in spraying, slower wet-out, less slide on vertical surfaces, suitable for the production of large parts like swimming pools, storage tanks, boats, and yachts.

  • ER13-2400-180

    Good runnability for spraying operation, moderate wet-out speed, easy roll-out, easy removal of bubbles, no spring back in sharp angles, excellent mechanical properties, and hydrolytic resistance in parts, suitable for high-speed spray-up processes with robots for sanitary ware, FRP hulls, auto parts, and chemical storage tanks.

  • ER13-2400-180K

    Fast wet-out, ideal for products with small surfaces like bathtubs.

Assembled Roving for SMC Product (7)

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Properties of Direct Roving

Tensile Strength

  • Direct roving has a high tensile strength, which is crucial for applications requiring high load-bearing capacity. For example, some direct rovings have tensile strengths up to 3,400 MPa.

Modulus of Elasticity

  • The modulus of elasticity for direct roving is typically around 72 GPa, providing good stiffness and hardness for composite materials.

Low Fuzz

  • Direct roving produces minimal fuzz during processing, helping maintain the integrity and quality of composite products.

Good Wet-out

  • Direct roving has excellent wet-out properties, meaning it can be easily impregnated with resin. This ensures optimal resin impregnation, enhancing the strength and stiffness of the finished parts.

Corrosion Resistance

  • Direct roving offers excellent chemical corrosion resistance, making it suitable for use in harsh environments frequently exposed to chemicals and corrosive substances.

Compatibility with Multiple Resin Systems

  • Direct roving is compatible with various resin systems, including unsaturated polyester, vinyl ester, epoxy, and phenolic resins. This versatility allows for widespread use in different composite materials.

Aging Resistance

  • Direct roving has excellent aging resistance, ensuring the long-term durability and performance of composite materials.

Specific Examples

  • Glass Fiber Direct Roving 312: This E-glass fiber roving is compatible with various resin systems, offering fast wet-out, good mechanical properties, and low fuzz. It is used in applications such as marine, chemical tanks, FRP pipes, geogrids, pressure vessels, and wind blades.
  • 308H Direct Roving: Produced using the E6 glass formulation and coated with a silane sizing composition, it is specifically used to reinforce epoxy resins, suitable for high-tension winding processes. It has excellent mechanical properties and fatigue resistance, providing good abrasion resistance and smoothness under high tension.
  • ECR-glass Fiber Direct Roving: Known for its excellent strand integrity and dispersion, low fuzz, high permeability to PP resin, and good mechanical properties. It is primarily used in industries such as automotive parts, construction, electronics, and aerospace.
What is the difference between e-glass and c-glass fiber?

E-glass fiber and C-glass fiber are common types of glass fibers used in various applications, each with distinct characteristics and advantages. Here is a detailed comparison:

Chemical Composition

  • E-glass: E-glass, or “electrical” glass, primarily consists of silica (SiO₂), alumina (Al₂O₃), calcium oxide (CaO), magnesium oxide (MgO), and boron oxide (B₂O₃). It is a low-alkali alumino-borosilicate glass with an alkali content of less than 0.8%.
  • C-glass: C-glass, known as “chemical resistance” glass, contains a higher proportion of calcium oxide (CaO) and is a soda-lime silicate glass. It has a higher alkali content (11.9%-16.4%) compared to E-glass.

Mechanical Properties

  • E-glass: Known for its high tensile strength (about 3,400 MPa) and modulus of elasticity (about 72 GPa). It offers excellent mechanical strength and rigidity, making it suitable for structural applications.
  • C-glass: While it has good mechanical strength, its tensile strength is generally lower than E-glass. It is designed to provide better chemical resistance rather than high mechanical performance.

Thermal Properties

  • E-glass: E-glass fibers have low thermal conductivity and can withstand temperatures up to 600°C. They are non-combustible and provide good thermal insulation.
  • C-glass: C-glass fibers also have good thermal insulation properties but are specifically designed to resist chemical corrosion at high temperatures, suitable for environments requiring high chemical resistance.

Electrical Properties

  • E-glass: E-glass is renowned for its excellent electrical insulation properties, making it ideal for electrical and electronic applications.
  • C-glass: C-glass is typically not used for electrical properties. It is chosen for its chemical resistance rather than electrical insulation.

Chemical Resistance

  • E-glass: E-glass fibers resist most chemicals, oils, and solvents. They also offer corrosion resistance and dimensional stability, even under varying humidity and temperature conditions.
  • C-glass: C-glass fibers have exceptional resistance to chemical corrosion, particularly to acids and other corrosive substances. This makes them suitable for harsh chemical environments.

Applications

  • E-glass: Widely used in applications requiring high mechanical strength and electrical insulation, such as fiberglass composites, boat hulls, automotive parts, aerospace structures, and sports equipment.
  • C-glass: Commonly used in applications requiring high chemical resistance, such as chemical storage tanks, pipes, and other equipment exposed to corrosive environments.

Cost

  • E-glass: Generally more cost-effective compared to other specialty glass fibers, making it popular for a wide range of applications.
  • C-glass: Considered a mid-range option in terms of cost, between E-glass fibers and high-performance specialty glass fibers.

Summary

  • E-glass: Preferred for its mechanical strength, electrical insulation, and cost-effectiveness. It is the most commonly used glass fiber in the fiber-reinforced polymer composites industry.
  • C-glass: Selected for its superior chemical resistance, making it ideal for applications in corrosive environments. While it has good mechanical properties, its main value lies in its chemical resistance.

In summary, the choice between E-glass and C-glass fibers depends on the specific requirements of the application. E-glass is favored for its strength and electrical properties, while C-glass is chosen for its chemical corrosion resistance.

What is the application of direct roving?

Direct roving, also known as single-end roving, has several key applications in composite manufacturing processes due to its unique properties. Here are the main applications of direct roving:

Filament Winding

Direct roving is widely used in the filament winding process for manufacturing composite pipes, pressure vessels, storage tanks, and other cylindrical structures. Its low fuzz, good integrity, and compatibility with resins such as unsaturated polyester, vinyl ester, epoxy, and phenolic resins make it ideal for this application.

Pultrusion

Direct roving is suitable for the pultrusion process, where reinforcing materials are pulled through a resin bath and heated die to produce profiles with a constant cross-section, such as window frames, ladders, gratings, and telecommunication cables. It is twist-free and has good wet-out properties, facilitating resin impregnation during pultrusion.

Weaving

Direct roving can be woven into fabrics for various composite applications, including geotextiles, multi-axial fabrics, and reinforcements for hulls, pipes, aircraft components, and automotive parts. Its seamless characteristics and compatibility with different resin systems make it suitable for weaving processes.

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