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Carbon Fiber Tows

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Carbon fiber tows on spools and bobbins, 3K to 24K and larger.

Carbon Fiber Tow Specifications

Property	Range / option	Note
Tow size	3K – 24K and larger	Lower counts drape better; higher counts process faster
Grade	Standard modulus to high modulus	Grade drives stiffness and price
Sizing	Sized / unsized	Epoxy-compatible sizing standard
Form	Spool, bobbin, creel-ready	48K large tow available on creel
Typical use	Weaving, prepreg, filament winding, chopping	Downstream form determines sizing choice

Ranges marked “confirmed per grade” are set by reinforcement and resin selection; send us your target specification and we confirm what we can supply.

Tow size decides the downstream process

Lower counts — 3K and 6K — spread and drape better, which makes them the usual choice for fine weaving, cosmetic surfaces and narrow prepreg tape. Higher counts from 12K to 24K and beyond process faster and cost less per kilo of fibre, which is why they dominate structural weaving, pultrusion and filament winding. 48K large tow is available on creel where the run justifies it.

Sizing has to match the matrix

A tow is not finished until the sizing is chosen. Epoxy-compatible sizing is our standard, because most of what we supply ends up in an epoxy or vinyl ester system. A thermoplastic matrix — PP, PA6, PPS — needs a size that survives melt processing and bonds to a non-reactive polymer, which is a different chemistry. Ordering the right tow with the wrong size is the most expensive mistake in this product line.

From tow to fabric to prepreg

Tow is the input, not usually the finished product. It becomes carbon fiber fabrics when it is woven, unidirectional tape when it is spread and impregnated, and chopped carbon fiber when it is cut. Specifying at the tow stage only makes sense when you control the next step yourself.

What to send us to get a usable quote

Tow size, grade (standard or high modulus), sizing, package form (spool, bobbin or creel-ready) and the downstream process. With those we confirm the grade and the documents that go with it — grade-specific TDS, SDS and COA. Start through contact.