In Reply to: What is the strongest, lightest composite posted by Scott on 02/25/02 at 4:10 PM:
You lucked out - structural composites (injection molded in particular) are my specialty.
The strongest injection moldable materials (assuming thermoplastic) are carbon fiber reinforced nylons. These include nylon 6, PPA, HTN, and similar materials. Tensile strengths are up to 48,000 psi (ultimate), with a modulus of 4.5 msi. Specific gravity is about 1.38 g/cc. Costs are typically in the $10/lb range.
There are some 'intermediate' strength materials which are glass fiber reinforced. For example, 50% long glass nylon 66 will have a tensile strength of about 37,000 psi, tensile modulus of 2.3 msi, and a specific gravity of about 1.57 g/cc. They cost in the range of $2.00/lb to $3.00/lb.
Anyway, if you have any questions, feel free to email.
In general, applications which truly require carbon fiber reinforced materials are rare. However, they are FUN to work on!