T300 CHOP
Reinforced grade
GB CCF-300
CHOP = chopped T300 fiber (3–12 mm) for compounds/SMC
Chopped/milled form for injection-moulding compounds, SMC/BMC, conductive and antistatic fillers.
Values for the CHOP condition
Other T300 grades and fills
T300 is listed in 9 conditions; see the grade overview at T300.
Compare all 9 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
3K plain/twill woven fabric + epoxy laminate, Vf ≈ 50 % | Quasi-balanced woven laminate for panels, tubes and cosmetic parts where drape and 2-axis properties matter. | — | 650 | 1.2 | — |
UD phenolic laminate | Choose for FST (fire-smoke-toxicity) interiors and ablative/carbon-carbon precursor parts. | — | 1,300 | 1.1 | — |
UD bismaleimide laminate, Vf ≈ 60 % | Pick when continuous service above ~150 °C is required (engine nacelle, missile, hot structure). | — | 1,750 | 1.3 | — |
UD epoxy laminate, Vf ≈ 60 % | Baseline unidirectional prepreg laminate — use for stiffness/strength-critical primary structure design values. | — | 1,860 | 1.4 | — |
3KDefault T300-3000 | Default aerospace/industrial small tow — plain and twill weaving, filament winding, prepreg for thin laminates. | — | 3,530 | 1.5 | — |
T300-1000 | Finest tow for very thin/lightweight fabrics and fine braids where drape and surface smoothness dominate cost. | — | 3,530 | 1.5 | — |
T300-6000 | Intermediate tow balancing fabric areal weight and cost for sporting goods and general industrial laminates. | — | 3,530 | 1.5 | — |
T300-12000 | Cheapest form per kg — heavy fabrics, pultrusion, filament winding of pressure vessels and industrial rollers. | — | 3,530 | 1.5 | — |
CHOPThis page Chopped T300 fiber (3–12 mm) for compounds/SMC | Chopped/milled form for injection-moulding compounds, SMC/BMC, conductive and antistatic fillers. | — | 3,530 | 1.5 | — |
What is T300 CHOP?
T300 CHOP is T300 in the CHOP grade — chopped/milled form for injection-moulding compounds, SMC/BMC, conductive and antistatic fillers. T300 CHOP has a tensile strength of 3,530 MPa (512 ksi), stronger than 88% of composite grades. Elongation at break is 1.5% and the elastic modulus is 230 GPa (33.4 Msi). T300 CHOP has a density of 1.76 g/cm³ (0.0636 lb/in³), heavier than 50% of composite grades. 3K is the default condition FabDigit quotes; CHOP is available on request or by drawing note.
Advantages
- Good corrosion resistance — 92/100, better than 94% of composite grades
- Polishes to a fine finish — 55/100, better than 83% of composite grades
- Stiff — 230 GPa (33.4 Msi), better than 82% of composite grades
- Good UV / weathering resistance — 95/100, better than 78% of composite grades
T300 CHOP properties
Typical room-temperature values for T300 CHOP; 10 are specific to this condition. Other listed values are T300 reference data and may not represent this condition. Bars are the position among composite grades.
Physical1
T300 CHOP has a density of 1.76 g/cm³ (0.0636 lb/in³), heavier than 50% of composite grades.
Mechanical6
T300 CHOP has a tensile strength of 3,530 MPa (512 ksi), stronger than 88% of composite grades. Elongation at break is 1.5% and the elastic modulus is 230 GPa (33.4 Msi).
Thermal6
T300 CHOP is rated for continuous service to 350°C (662 °F). It conducts heat at 10.5 W/m·K (6.07 BTU/hr·ft·°F), better than 73% of composite grades. Thermal expansion is -0.41 µm/m·K (-0.228 µin/in·°F).
Electrical2
T300 CHOP has an electrical resistivity of 1.7×10⁻⁵ Ω·m.
Chemical & Environmental3
Corrosion resistance is excellent (92/100), better than 94% of composite grades. UV resistance is excellent.
Sustainability4
Producing a kilogram of T300 CHOP takes about 400 MJ of energy and emits 26 kg of CO₂ — more than 77% of composite grades. Typical recycled content is 0%.
Manufacturability2
T300 CHOP's machinability is poor (30/100, worse than 54% of composite grades).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with T300 CHOP
Is T300 easy to machine?
Cured laminates must be cut/drilled with PCD or diamond-coated tooling at high speed and low feed, backed up to prevent delamination; dust is conductive and requires sealed extraction.
Can T300 be welded?
Not weldable — thermoset laminates are joined by adhesive bonding or bolted/bushed joints; isolate from aluminium with glass ply or sealant to avoid galvanic corrosion.
Can T300 be formed, bent or molded?
Processed as prepreg autoclave/oven cure (typ. 120–180 °C epoxy, 0.3–0.6 MPa), RTM/infusion, filament winding or pultrusion; drape of 3K woven fabric is good, UD tape needs careful ply-drop design.
What surface finishes work on T300?
Surface finished with peel-ply plus fill-primer, clear UV-blocking topcoat for visible weave; never anodize/plate directly, and seal edges to stop moisture wicking.
T300 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Ccarbon content of PAN-based standard-modulus fiber | 92 – 95 | 93 |
| Nresidual nitrogen from PAN precursor | 3 – 6 | 5 |
| Osurface oxygen after electrolytic surface treatment | 0.5 – 3 | 1.5 |
| epoxy sizing40B/50B/60E size level, wt % | 0.7 – 1.5 | 1 |
| Na+K (alkali)impurity limit | ≤ 0.01 | 0 |
T300 CHOP — frequently asked
What is T300 CHOP used for?
T300 CHOP is typically used for aircraft secondary structures, sporting goods, pressure vessels, wind turbine spars and automotive body panels. In short: industry benchmark carbon fiber; widest prepreg availability; lowest-cost aerospace-grade tow.
What is the tensile strength of T300 CHOP?
T300 CHOP has a typical tensile strength of 3,530 MPa (512 ksi) — stronger than 88% of composite grades. Strength varies by condition: see the 9 listed tempers.
Is T300 CHOP easy to machine?
Not especially — machinability is rated poor (30/100, worse than 54% of composite grades). Cured laminates must be cut/drilled with PCD or diamond-coated tooling at high speed and low feed, backed up to prevent delamination; dust is conductive and requires sealed extraction.
Can T300 CHOP be welded?
Not weldable — thermoset laminates are joined by adhesive bonding or bolted/bushed joints; isolate from aluminium with glass ply or sealant to avoid galvanic corrosion.
What surface finishes work on T300 CHOP?
Surface finished with peel-ply plus fill-primer, clear UV-blocking topcoat for visible weave; never anodize/plate directly, and seal edges to stop moisture wicking.
Can T300 CHOP be formed, bent or molded?
Processed as prepreg autoclave/oven cure (typ. 120–180 °C epoxy, 0.3–0.6 MPa), RTM/infusion, filament winding or pultrusion; drape of 3K woven fabric is good, UD tape needs careful ply-drop design.
What is the maximum service temperature of T300 CHOP?
T300 CHOP is rated for continuous use to about 350°C (662 °F), and briefly to 500°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- TORAYCA T300 Standard Modulus Carbon Fiber Data Sheet — Toray Composite Materials (2023)
- ASM Handbook Vol. 21: Composites — ASM International (2001)
- MIL-HDBK-17 / CMH-17 Polymer Matrix Composites, carbon/epoxy lamina data — CMH-17 / SAE (2012)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.