Epoxy/Carbon Fiber (CFRP) vs GFRP / GFK (Glass Fiber Reinforced Epoxy): 67% composition overlap. Moderate differences, generally not direct substitutes.
Epoxy/Carbon Fiber (CFRP) vs GFRP / GFK (Glass Fiber Reinforced Epoxy)
Side-by-side chemical composition and mechanical property comparison.
Overview
Epoxy/Carbon Fiber (CFRP)
Carbon fiber reinforced epoxy — the benchmark structural composite material. Unidirectional ply: tensile strength 1500–2000 MPa, modulus 120–150 GPa at density 1.55 g/cm³ (5x stronger than steel at 1/5 the weight). Quasi-isotropic layup: UTS ~600 MPa, E ~50 GPa. Autoclave-cured prepreg (aerospace) or infusion/RTM (industrial). Used in aerospace primary structures (fuselage, wings), Formula 1 chassis, bicycle frames, wind turbine blades, pressure vessels (Type IV) and high-end sporting goods. Fiber types: T300, T700, T800, M40J, M55J.
GFRP / GFK (Glass Fiber Reinforced Epoxy)
Glass fiber reinforced epoxy composite — the cost-effective structural composite for industrial, marine and construction applications. E-glass fiber in epoxy matrix. Unidirectional: UTS ~1000 MPa, E ~40 GPa. Quasi-isotropic layup: UTS ~300 MPa, E ~18 GPa. Density 1.8–2.1 g/cm³. Electrically insulating (unlike CFRP). Used for boat hulls, wind turbine blades, chemical tanks/pipes, architectural panels, ladders, gratings, automotive body panels and electrical insulation structures.
| Epoxy/Carbon Fiber (CFRP) | GFRP / GFK (Glass Fiber Reinforced Epoxy) | |
|---|---|---|
| Material Number | — | — |
| Category | Polymers | Polymers |
| Standard | ASTM D3039 | ASTM D3039 |
Chemical composition (wt%) — Pro
| Element | Epoxy/Carbon Fiber (CFRP) | GFRP / GFK (Glass Fiber Reinforced Epoxy) | Overlap |
|---|---|---|---|
| Epoxy Resin Matrix | 30–40% | 30–45% | OK |
| Carbon Fiber Reinforcement | 60–70% | — | — |
| Glass Fiber Reinforcement | — | 55–70% | — |
Mechanical properties — Pro
| Property | Epoxy/Carbon Fiber (CFRP) | GFRP / GFK (Glass Fiber Reinforced Epoxy) | Unit |
|---|---|---|---|
| Tensile Strength | 1500–2000 | 900–1100 | MPa |
| Tensile Modulus | 120–150 | 38–45 | GPa |
| Density | 1.5–1.6 | 1.8–2.1 | g/cm³ |
| Fiber Volume Fraction | |||
| Glass Transition Temp (Tg) | |||
| Interlaminar Shear Strength | |||
| Water Absorption (24h) |
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Sign up free — 3 comparisons/day freeCompatibility Assessment
Epoxy/Carbon Fiber (CFRP) and GFRP / GFK (Glass Fiber Reinforced Epoxy) have moderate differences (67% overlap). They are generally not direct substitutes. Consider the specific requirements of your application.
Automated assessment based on composition analysis
Frequently Asked Questions
Is Epoxy/Carbon Fiber (CFRP) the same as GFRP / GFK (Glass Fiber Reinforced Epoxy)?
Epoxy/Carbon Fiber (CFRP) and GFRP / GFK (Glass Fiber Reinforced Epoxy) have a 67% composition overlap. They are generally not directly interchangeable.
Can I replace Epoxy/Carbon Fiber (CFRP) with GFRP / GFK (Glass Fiber Reinforced Epoxy)?
Generally not recommended. The compositions differ significantly (67% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between Epoxy/Carbon Fiber (CFRP) and GFRP / GFK (Glass Fiber Reinforced Epoxy)?
The main differences are in the following elements: overall alloying content. Epoxy/Carbon Fiber (CFRP) is a Polymers grade, while GFRP / GFK (Glass Fiber Reinforced Epoxy) is a Polymers grade.
View full data for each material:
Data provided for reference only. Always verify against the applicable specification for critical applications.
All data is for reference only. Equivalents indicate similarity, not identity. Always verify against the applicable specification for safety-critical applications. materialref.com accepts no liability for decisions based on this data.