ZOLTEK, together with Toray, has developed a new innovative technology and input material for Sheet Molding Compound (SMC) for compression molding. SMC is a material consisting of resin and chopped carbon fiber which is placed into matched metal tooling to mold a finished part.
The new carbon fiber tow product still consists of a large tow (50K), but it is now split into 3K sub tows, so that when chopped it breaks apart into a homogeneous isotropic bed of small tow carbon fiber which is easily wet out in the SMC process. The resulting molding compound produces a revolutionary strong and stiff composite part suitable for automotive and other applications.
Final parts molded from SMC benefit from a high throughput compounding process coupled with low cost inputs (resin and fiber). Further, the molding process is highly efficient with very low waste. More than 97% of the compound is used in the final molded part with very little edge trim or other scrap.
|Typical Properties - Cut Coupons, Average 0/90:|
|Specific Gravity||ASTM D792||g/cm3||1.41|
|Tensile Modulus||ASTM D638||GPa||34.0|
|Tensile Strength||ASTM D638||MPa||217|
|Flexural Modulus||ASTM D790||GPa||27.6|
|Flexural Strength||ASTM D790||MPa||432|
|Impact Strength N -Izod||ASTM D4812||J/m||483|
|Glass Transition by DMA||ASTM 7028||°C (Tan Delta)||>192|
|Water Absorption||ASTM D570||%||<0.30|
|DTUL (HDT)||ASTM D648||°C||>250|