T300
GB CCF-300
T300 is the original standard-modulus PAN-based carbon fiber and the benchmark reinforcement for general aerospace and industrial CFRP, with 3530 MPa tensile strength, 230 GPa modulus, 1.5 % elongation and 1.76 g/cm³ density.
Reference datasheet — T300 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the 3K condition
T300 grades and fills
T300 is supplied in 9 conditions, soft to hard. 3K is the default FabDigit quotes; the values on this page are for it.
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 | ||
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 |
Supply forms, finishes and certifications
Ways T300 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
40B | 40B sizing | Surface finish |
50B | 50B sizing | Surface finish |
60E | 60E sizing | Surface finish |
What is T300?
T300 is the original standard-modulus PAN-based carbon fiber and the benchmark reinforcement for general aerospace and industrial CFRP, with 3530 MPa tensile strength, 230 GPa modulus, 1.5 % elongation and 1.76 g/cm³ density. Engineers use it because property data, prepregs and fabrics are widely available: 1K, 3K, 6K and 12K tows, 40B/50B/60E sizings, UD and fabric epoxy prepreg, UD BMI, UD phenolic, and chopped fiber. Limits are strength well below modern high-strength fibers, thermoset laminates that cannot be welded, and galvanic attack on aluminium at unsealed interfaces. T700S is the direct step up when higher tensile strength is required at the same modulus. T300 has a density of 1.76 g/cm³ (0.0636 lb/in³), heavier than 50% of composite grades. T300 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).
What is T300 used for?
- aircraft secondary structures
- sporting goods
- pressure vessels
- wind turbine spars
- automotive body panels
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 properties
Typical room-temperature values for T300-3K; bars are the position among composite grades.
Physical1
T300 has a density of 1.76 g/cm³ (0.0636 lb/in³), heavier than 50% of composite grades.
Mechanical6
T300 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 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 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 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's machinability is poor (25/100, worse than 65% of composite grades).
Common Calculations4
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the composite family
Yield strength against density for every composite grade FabDigit runs. T300 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with T300
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.
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 |
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.
Equivalent designations
Standards and trade names that resolve to T300 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- GB (China)
- CCF-300
How much does T300 cost?
T300 is a high-cost composite ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
T300 — frequently asked
What is T300 used for?
T300 is typically used for aircraft secondary structures, sporting goods, pressure vessels, wind turbine spars and automotive body panels. In short: industry benchmark carbon fiber; widest prepreg availability; lowest-cost aerospace-grade tow.
What is the tensile strength of T300?
T300 has a typical tensile strength of 3,530 MPa (512 ksi) — stronger than 88% of composite grades. Strength varies by condition: see the 9 listed tempers.
Is T300 easy to machine?
Not especially — machinability is rated poor (25/100, worse than 65% of composite grades). Cured laminates must be cut/drilled with PCD or diamond-coated tooling at high speed and low feed, backed up to prevent delamination; dust is conductive and requires sealed extraction.
Can T300 be welded?
Not weldable — thermoset laminates are joined by adhesive bonding or bolted/bushed joints; isolate from aluminium with glass ply or sealant to avoid galvanic corrosion.
What surface finishes work on T300?
Surface finished with peel-ply plus fill-primer, clear UV-blocking topcoat for visible weave; never anodize/plate directly, and seal edges to stop moisture wicking.
Can T300 be formed, bent or molded?
Processed as prepreg autoclave/oven cure (typ. 120–180 °C epoxy, 0.3–0.6 MPa), RTM/infusion, filament winding or pultrusion; drape of 3K woven fabric is good, UD tape needs careful ply-drop design.
What is the maximum service temperature of T300?
T300 is rated for continuous use to about 350°C (662 °F), and briefly to 500°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does T300 cost?
T300 is a high-cost composite ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
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; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.