T700S
GB CCF-700
T700S is a high-strength PAN-based carbon fiber offering 4900 MPa tensile strength and 2.1 % elongation at the same 230 GPa modulus as T300, at a density of 1.8 g/cm³.
Reference datasheet — T700S 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 12K-50C condition
T700S grades and fills
T700S is supplied in 7 conditions, soft to hard. 12K-50C is the default FabDigit quotes; the values on this page are for it.
Compare all 7 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
T700S woven fabric / epoxy laminate | Choose the 3K plain or twill woven/epoxy laminate (Vf ~ 50 %) for shells, panels and visible parts needing quasi-isotropic in-plane properties and better drape; strength falls to 780 MPa. | 780 | 1.3 | ||
T700S / epoxy unidirectional laminate | Use these cured unidirectional prepreg values (Vf ~ 60 %, 2450 MPa and 132 GPa at 0°, Tg 125 °C) for sizing spars, skins and rods; off-axis and transverse properties are far lower. | 2,450 | 1.7 | ||
Filament-wound hoop laminate / NOL ring | Use the wet-wound hoop values (2550 MPa, 138 GPa, Vf ~ 62 %, including the winding translation factor) for pressure-vessel and gas-cylinder design; service temperature limit is 85 °C. | 2,550 | 1.7 | ||
12K-50CDefault 12K tow, 50C sizing | Pick the 12K dry tow with 50C epoxy sizing as the general-purpose form for prepreg, filament winding and pultrusion; 4900 MPa tensile, 230 GPa modulus and 2.1 % elongation on the fiber axis. | 4,900 | 2.1 | ||
24K tow, 50C sizing | Choose the 24K large tow with 50C sizing to cut cost and raise lay-down rate in winding, pultrusion, wind-energy and pressure-vessel parts; strength stays 4900 MPa but tow placement is coarser. | 4,900 | 2.1 | ||
60E sizing | Use 60E sizing when wet filament winding or pultruding with epoxy or vinyl-ester resins; sizing level and tow spreading are tuned for wet processes rather than for prepreg lines. | 4,900 | 2.1 | ||
F0E sizing | Pick F0E sizing for the fastest resin wet-out in high-speed wet winding of CNG and hydrogen cylinders; use 60E or 50C instead for pultrusion or prepreg impregnation. | 4,900 | 2.1 |
What is T700S?
T700S is a high-strength PAN-based carbon fiber offering 4900 MPa tensile strength and 2.1 % elongation at the same 230 GPa modulus as T300, at a density of 1.8 g/cm³. It is the standard choice for filament-wound pressure vessels and structural prepregs, supplied as 12K-50C and 24K-50C tows, 60E and F0E sizings, UD and fabric epoxy prepreg, and winding-grade product. Modulus is unchanged from standard-modulus fiber, so stiffness-driven designs gain nothing; laminates are not weldable and need galvanic isolation from aluminium and steel. Move to T800H when intermediate modulus is required. T700S has a density of 1.8 g/cm³ (0.065 lb/in³), heavier than 59% of composite grades. T700S has a tensile strength of 4,900 MPa (711 ksi), stronger than 95% of composite grades. Elongation at break is 2.1% and the elastic modulus is 230 GPa (33.4 Msi).
What is T700S used for?
- CNG/hydrogen tanks
- wind blades
- automotive structural parts
- robotics arms
- sporting goods
Advantages
- Good corrosion resistance — 90/100, better than 85% of composite grades
- Stiff — 230 GPa (33.4 Msi), better than 82% of composite grades
Limitations
- High embodied carbon — 28 kg CO₂/kg, worse than 76% of composite grades
T700S properties
Typical room-temperature values for T700S-12K-50C; bars are the position among composite grades.
Physical1
T700S has a density of 1.8 g/cm³ (0.065 lb/in³), heavier than 59% of composite grades.
Mechanical8
T700S has a tensile strength of 4,900 MPa (711 ksi), stronger than 95% of composite grades. Elongation at break is 2.1% and the elastic modulus is 230 GPa (33.4 Msi).
Thermal6
T700S is rated for continuous service to 350°C (662 °F). It conducts heat at 9.4 W/m·K (5.43 BTU/hr·ft·°F), better than 70% of composite grades. Thermal expansion is -0.38 µm/m·K (-0.211 µin/in·°F).
Electrical2
T700S has an electrical resistivity of 1.6×10⁻⁵ Ω·m.
Chemical & Environmental3
Corrosion resistance is excellent (90/100), better than 85% of composite grades. UV resistance is good.
Sustainability3
Producing a kilogram of T700S takes about 400 MJ of energy and emits 28 kg of CO₂ — more than 77% of composite grades. Typical recycled content is 0%.
Manufacturability1
T700S'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. T700S is highlighted; hover a dot for its name, or open the interactive family chart.
Working with T700S
Is T700S easy to machine?
Cured parts need PCD or diamond-coated tooling at high spindle speed and low feed, with dust extraction and backing support to prevent delamination and burrs. Use ceramic yarn guides on dry tow to avoid fuzzing.
Can T700S be welded?
Not weldable; joints rely on adhesive bonding, co-curing or mechanical fastening. Use titanium or stainless fasteners with an insulating layer to prevent galvanic corrosion.
Can T700S be formed, bent or molded?
Common routes are wet or dry filament winding, prepreg autoclave or press cure at 120–180 °C, RTM and pultrusion. Winding tension and resin wet-out time are the critical process parameters.
T700S 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 carbon fiber | 93 – 95.5 | 94 |
| Nresidual nitrogen | 3 – 6 | 4.5 |
| Osurface oxygen functional groups | 0.3 – 1.5 | 0.8 |
| sizing (epoxy-compatible)sizing content, varies with 50C/60E/F0E type | 0.3 – 1 | 0.5 |
What surface finishes work on T700S?
Sand and apply a clear or polyurethane topcoat for UV protection. Contact faces against aluminium or steel must be separated by glass cloth or a barrier coating.
Equivalent designations
Standards and trade names that resolve to T700S in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- GB (China)
- CCF-700
How much does T700S cost?
T700S is a high-cost composite ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
T700S — frequently asked
What is T700S used for?
T700S is typically used for CNG/hydrogen tanks, wind blades, automotive structural parts, robotics arms and sporting goods. In short: best strength-per-cost tow; standard filament-winding fiber; higher strength than T300.
What is the tensile strength of T700S?
T700S has a typical tensile strength of 4,900 MPa (711 ksi) — stronger than 95% of composite grades. Strength varies by condition: see the 7 listed tempers.
Is T700S easy to machine?
Not especially — machinability is rated poor (25/100, worse than 65% of composite grades). Cured parts need PCD or diamond-coated tooling at high spindle speed and low feed, with dust extraction and backing support to prevent delamination and burrs. Use ceramic yarn guides on dry tow to avoid fuzzing.
Can T700S be welded?
Not weldable; joints rely on adhesive bonding, co-curing or mechanical fastening. Use titanium or stainless fasteners with an insulating layer to prevent galvanic corrosion.
What surface finishes work on T700S?
Sand and apply a clear or polyurethane topcoat for UV protection. Contact faces against aluminium or steel must be separated by glass cloth or a barrier coating.
Can T700S be formed, bent or molded?
Common routes are wet or dry filament winding, prepreg autoclave or press cure at 120–180 °C, RTM and pultrusion. Winding tension and resin wet-out time are the critical process parameters.
What is the maximum service temperature of T700S?
T700S is rated for continuous use to about 350°C (662 °F), and briefly to 500°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does T700S cost?
T700S is a high-cost composite ($$$$), 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 T700S Technical Data Sheet — Toray Composite Materials (2023)
- ASTM D4018 — Tensile Properties of Continuous Filament Carbon and Graphite Fiber Tows — ASTM (2017)
- CMH-17 (MIL-HDBK-17) Composite Materials Handbook, Vol. 2 — Polymer Matrix Composites — SAE International (2012)
- NCAMP Qualification Report — Toray T700S/2510 Unidirectional Tape — NCAMP/NIAR (2011)
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.