Fracture data for composites

During lecture 5 (April 28, 2009) - Test Methods, by Dr. Ran Kim, a participant asked for fracture data for common composites. Dr. Kim sent the following response:
“Following are some toughness data for materials tested at our Lab.
Material ------GIC(lb/in)-----GIIC(lb/in)
AS4/3501-6 ------0.5 -----------3.9
IM6/3501-6 ------1.3------------3.2
IM7/5250-6 ------1.3------------3.6
IM7/977-2 --------2.3------------4.8
AS4/APC2 -------7.6-----------15
IM7/8552 --------3.0-----------12
conversion factor: lb/in = 175 J/m^2 (square meter).”