Fibre Tressée Understanding T700 carbon in sports rackets

T700 carbon: what this designation really means

Published on October 21, 2026 Reviewed October 22, 2026 4 min read

Text by the Fibre Tressée editorial team.

Spool of black carbon fiber resting on a workbench, with a blurred racket in the background.
One fiber, one designation. T700 designates a grade of carbon fiber in the Toray range, classed among standard modulus fibers. The mention describes neither the whole racket nor the quality of its manufacture. It only tells you about one of the possible materials of the frame or faces. To judge a model, you therefore need to look at where the fiber is used and how it is assembled.

T700 is a carbon fiber designation created by Toray and often repeated on racket spec sheets. This section explains what it refers to and what it does not guarantee. The section "Understanding T700 carbon" starts here, with its reference points, its entries, and its articles.

What organizes the subject

At the heart of the method lies this point: Toray presents standard modulus as the most economical category of carbon fiber in its range. Come back to this idea whenever a doubt arises.

Let us first set out this principle: a carbon fiber is a filament about 5 to 10 micrometers in diameter, made up mostly of carbon atoms, with high stiffness and high tensile strength relative to its weight.

Here is the basic principle to keep in mind: Toray presents the T700S as a standard modulus, high tensile strength fiber, with processing characteristics suited to filament winding, weaving, and prepreg. Keep this rule in mind for the parts that follow.

Remember this underlying rule: the T700G is a variant of the T700S with reinforced fiber-resin adhesion; Toray intends it in particular for aerospace and sporting goods. Make this principle your anchor for reading.

The essential concepts, developed

This part develops at greater length the notions I have just announced.

Intermediate modulus fiber

This classification helps place the T700S, a standard modulus fiber, in relation to other grades presented as stiffer.

As an example, Toray's page on standard, intermediate, and high modulus fibers makes it possible to compare these categories. You will find the full detail in the entry Intermediate modulus fiber.

Useful vocabulary

Here is the glossary for this section; click a term to open its entry.

  • Intermediate modulus fiber — a category of carbon fibers stiffer than standard modulus fibers, but less stiff than high modulus ones.

The articles in this guide: the essentials

Open the article of your choice from the list below.

First readings

Here is the right reflex: the home page of the Fédération Internationale de Padel (FIP) does not detail the permitted dimensions or materials of palas; those requirements are found in its regulatory documents, which you should consult directly. Keep this habit at hand for what follows.

Decision criteria

Among the points of comparison, consider this one: Toray classifies the T700G, the version with reinforced fiber-resin adhesion, among the fibers intended for sporting goods, so a T700 grade can exist in several variants (T700S, T700G) with different uses. Weigh this point according to your own priorities.

Other useful reference points, up close

Let us pause on this measurement: the tensile modulus of the T700S fiber is 33.4 MSi, or 230 GPa.

The figure to remember: at Toray, standard modulus fibers have a modulus of about 33-34 MSi or slightly higher; this family includes the T300, T700S, and T700G.

Note this figure: the Toray T700S carbon fiber has a tensile strength of 711 ksi, or 4,900 MPa.

Pitfalls to know, up close

Keep a close eye on this point: a standard modulus fiber is not the stiffest. Intermediate modulus fibers (42 MSi) and high modulus fibers (up to 85.3 MSi) exist, so "T700" is not synonymous with maximum stiffness.

Possible next steps

Take note of the reference points below before moving on.

  • The T300 is Toray's reference fiber, used in aerospace for more than 20 years; the T700 belongs to the same standard modulus family.
  • Toray's M series (M35J to M60J) covers moduli from 49.8 to 85.3 MSi (343 to 588 GPa): the T700, at 33.4-34.8 MSi, therefore sits in the lower part of the stiffness scale for Toray carbon fibers.

Related reading

Sources cited

Sources and verification

  • This text draws on 5 sources: 1 official body or institution and 3 manufacturer documentation sources.
  • Facts checked against their sources on October 13, 2026.
  • How sources are chosen and verified: Fact-checking.