3mm Carbon Fiber Sheet – High Rigidity Industrial-Grade Steel Alternative
1. Product Positioning
This entry refers specifically to a solid 3 mm carbon fiber laminate with no honeycomb or foam core—fully carbon-reinforced resin. Unlike standard 3 K sheets, this thick sheet offers high flexural inertia and machinability, making it a direct lightweight replacement for 5 mm+ aluminum-magnesium alloys.
2. Material System
Fibers
- Core layers: T700‑12K unidirectional 0°/90° cross‑ply (60 vol %)
- Surface layers: 2-ply 3 K twill weave for enhanced impact resistance and aesthetics
Resins
- Standard epoxy: Tg 130 °C (operational < 120 °C)
- High-temperature epoxy: Tg 180 °C (short-term resistance up to 200 °C)
- Flame-retardant epoxy: UL94‑V0, ideal for rail interior use
Process
- Autoclave cure at 0.6 MPa / 150 °C — porosity <1 %
- Secondary flattening — flatness ≤0.2 mm/m; no need for post-milling
3. Mechanical Properties (average for 3 mm sheet)
| Property | Value | Notes |
|---|---|---|
| Density | 1.58 g/cm³ | includes resin |
| Flexural Strength | 620 MPa | 3-point bending, 100 mm span |
| Flexural Modulus | 120 GPa | same testing conditions |
| Interlaminar Shear | 85 MPa | short-beam shear test |
| Impact Toughness | 45 kJ/m² | notched impact test |
| Thermal Expansion | <1.5×10⁻⁶/°C | 0–100 °C |
| Thermal Conductivity | 1.2 W/(m·K) | in-plane |
4. Common Stock Sizes (3.0 ± 0.1 mm)
| Size (mm) | Weight (kg) | Typical Use |
|---|---|---|
| 200×250 | 0.24 | Drone battery tray support |
| 300×400 | 0.57 | Robot joint base |
| 400×500 | 0.95 | Industrial camera gantry beam backing |
| 500×600 | 1.42 | CNC fixture base |
| 500×1000 | 2.37 | Racing anti-roll bar mount |
| 600×1200 | 3.41 | Medical CT board reinforcement layer |
| 1000×1000 | 4.74 | Optical platform local aluminum replacement |
| 1200×2400 | 13.63 | UAV wing skin‑rib composite panel |
Custom sizing up to 1500×3000 mm; CNC cut to any shape.
5. Surface & Appearance
- Standard: 3 K twill matte black (prototype-grade)
- Upgrade: 3 K plain weave glossy, A‑grade mirror finish (ready for visible parts)
- Functional coatings: PU wear-resistance, conductive copper mesh core, anti-slip sandblasted finishes
6. Post-Processing Capabilities
- CNC milling: hole tolerance ±0.05 mm; min slot width 1 mm; up to 2.5 mm depth without edge chipping
- Waterjet: low‑thermal cutting with min clearance 3 mm
- Threaded inserts: M3–M8 stainless Helicoil with pull-out strength ≥8 kN
- Bonding: epoxy structural adhesive + vacuum bag, ideal for metal–carbon composite integration
7. Typical Applications
- Drones: 3 mm wing skin‑rib integrated panels, saving 48 % weight over aluminum
- Robotics: 400×500 mm joint base with <0.05 mm deflection at 100 N
- Automotive: racing anti-roll bar mount, CNC machined from 3 mm sheet—60 % lighter than 6 mm aluminum
- Medical: CT table reinforcement patches—20 % X‑ray transmission improvement
- Optics: laser platform replacements, reducing thermal drift by 70 %
8. Ordering & Delivery
- Stock minimum: 1 sheet; custom minimum: 10 sheets
- Lead time: in-stock 24 h; custom 3–7 days
- Packaging: film wrap → foam separators → carton/wooden crate for scratch-free shipping
- Certification: material batch report, RoHS, REACH, UL94‑V0 (flame-retardant version)
3 mm Carbon Fiber Sheet delivers peak rigidity, lightweight performance, and machinability—all in one thick laminate.
Offline Contracts
All sales of our carbon fiber materials are conducted through offline contract agreements to ensure each order precisely meets your specifications, compliance requirements, and agreed payment terms. Please contact our sales team to initiate the contract process and discuss project details.
| name | value | unitCode | unitText |
|---|---|---|---|
| MOQ | 50 | PCS | |
| Lead Time | 5–20 | business days | |
| Material | Carbon Fiber | ||
| Size | Customizable (thickness / width / length) |
Resources
This refined description aligns with SEO best practices, features keyword implementation, crystal-clear structure, and strong callouts for trust and action.
