6.C.1.Resin impregnated fibre prepregs and metal coated fibre preforms, for the goods specified in 6.A.1., made either with organic matrix or metal matrix utilising fibrous or filamentary reinforcements having a ‘specific tensile strength’ greater than 7.62 x 10⁴ m and a ‘specific modulus’ greater than 3.18 x 10⁶ m.

Note:
The only resin impregnated fibre prepregs specified in 6.C.1. are those using resins with a glass transition temperature (Tg), after cure, exceeding 145oC as determined by ASTM D4065 or national equivalents.
Technical Notes:
1. In Item 6.C.1. 'specific tensile strength' is the ultimate tensile strength in N/m² divided by the specific weight in N/m³, measured at a temperature of (296 ± 2)K ((23 ± 2)°C) and a relative humidity of (50 ± 5)%.
2. In Item 6.C.1. 'specific modulus' is the Young's modulus in N/m² divided by the specific weight in N/m³, measured at a temperature of (296 ± 2)K ((23 ± 2)°C) and a relative humidity of (50 ± 5)%.