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Widely used in familiar products such as golf club shafts or fishing rods, and also as cutting-edge ACMs (Advanced Composite Materials) for aircrafts and rockets, Prepreg is made by impregnating fibers such as carbon fiber, glass fiber, and aramid fiber with uncured thermosetting resins (epoxy resins).
Prepreg comes in various types, including unidirectional, woven, and roving.
Thermoplastic Prepreg is also available for special needs.
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 Products & properties
Properties of prepreg
Product types
| Product types |
Standard shipping forms |
Unidirectional
prepreg (UD) |
100 cm, 50 cm-width sheets |
Roll wound ( 100m ) |
| 6-inch width ( for ATL ) |
Reel wound ( 200-300m ) |
| Narrow fabrics |
Reel wound |
| Woven prepreg |
100 cm width |
Roll wound ( 100m ) |
| Roving prepreg |
|
Bobbin wound |
Applicable fibers
- Carbon fibers : TENAX (e.g., HTA, IM, UM)
- Glass fibers, aramid fibers
- Others : SiC fibers, pitch-based carbon fibers
Major products are listed in Table 1
Table 1 Prepreg of Toho
Product
No.
(Toho assigned) |
Resin |
Cure
temperature |
Characteristics |
Application
examples |
| 112 |
Epoxy |
125 oC |
General use |
Corporations, satellites, sports/recreation |
| 118 |
Epoxy |
125 oC |
General use |
Corporations, satellites, sports/recreation |
| 11H |
Epoxy |
125 oC |
General use |
Corporations, satellites |
| 123 |
Epoxy |
125 oC |
Flame retardant,
shock resistant |
Railway cars |
| 171 |
Epoxy |
98-180 oC |
Die prepreg |
CFRP, GFRP die |
| 144 |
Epoxy |
125 oC |
Self adhesive,
flame retardant |
Aircraft parts, railway cars |
| 101 |
Epoxy |
180 oC |
Heat resistant |
Aircraft parts |
| 132 |
Epoxy |
180 oC |
Heat resistant,
high elongation |
Aircraft parts |
| 133 |
Epoxy |
180 oC |
High CAI |
Aircraft parts |
| 135 |
Epoxy |
180 oC |
Heat resistant,
self adhesive |
Aircraft parts |
| 331 |
Bismalamide |
180 oC |
Heat resistant,
shock resistance |
Aircraft parts |
| 332 |
Bismalamide |
180 oC |
Heat resistant,
high CAI |
Aircraft parts |
| 301 |
Bismalamide |
180-240 oC |
Highly heat
resistant |
Automobiles,
Aircraft parts |
<Note>
- Die prepreg is marketed under tde product name of BES Tool.
- As for thermoplastic prepreg, carbon fiber prepreg with matrix resins PEEK, PC, and PEI have been developed.
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