Hi there, my names Noel Craig, I'm from Belfast in Northern Ireland and would like to ask the community here
about their experience with graphene as a potential additive in lightweight high strength composite 
materials. Alternatively perhaps you have heard about the material but have been driven away by the
shocking cost of it.

I ask because it has been the subject of personal research along with nano materials  for around two years now
and I have developed my own top down environmentally friendly and highly scale-able approach to it's production.
I am not here to sell my material but just to get an idea as to how common in usage the material has become.

Thanks
Noel

There is more to think about than just the price. What quality of graphene are you able to produce? What chip diameter, what thickness? Are you able to functionalise the surface to get a good bond to the epoxy resin? To get good results all this should be taken into consideration.
You cannot substitute the carbon fibres by adding graphene powder to the resin. There is something called critical fibre length. It is the length a reinforcing fibre should have at least to transfer all of it's strength propertys through the composite structure. it depends on the stiffness of both reinforcement and matrix, the diameter of the reinforcement, the adhesion strength, the form of the reinforcing particles (fibres are optimal, flakes are the second choice) and some othe factors. For carbon fibre we are talking about millimetres. The rule of thumb is 50mm. Making the fibre longer doesn't increase it's performance. While regular carbon fibres are not as strong as graphene, they are much, much longer (graphene flakes usually have diameters of several nanometres up to a micrometre). And they are fibres, not flakes. So although it's better individual characteristics, graphene doesn't increase the global mechanical propertys of a composite structure in a way a carbon cloth would do.
To me 25% seems much to much. You need the resin to glue the fibres together. So more graphene filler doesn't mean better characteristics.
In my opinion 1% and less graphene addition is the optimum for manufacturers. Because than you can add the word graphene to your pr and may sell some more products.