Intermediate modulus fiber
Definition Reviewed October 22, 2026 Also called: intermediate modulus, IM fiber
The gist. A category of carbon fibers that are stiffer than standard modulus fibers, but less stiff than high modulus fibers.
Explanation
Fiber manufacturers sort their products into standard, intermediate, and high modulus. The intermediate category sits between the other two in terms of fiber stiffness.
This classification helps you place the T700S, a standard modulus fiber, in relation to other grades presented as stiffer.
An example
The Toray page on standard, intermediate, and high modulus fibers lets you compare these categories.
Questions and answers
Is T700 an intermediate modulus fiber?
No: Toray presents the T700S as a standard modulus fiber.