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Hi Martin,
I've just posted a reply to your main question and in this I've discussed the post-curing process for using a high temperature resin but to help others I'll repeat that information here:
When working with any 'High Temperature' epoxies what you will certainly need to do is 'post cure' the part before you use it. Post curing is where you gradually heat the part up to at least its future operating temperature, thereby fully curing the resin and realising the best mechanical performance (and high HDT - Heat Distortion Temperature). Put simply, this means that if you make your heat-shield, once it's cured fully in the mould at room temperature you would leave it in the mould and put the mould somewhere very warm (40 degrees) for maybe 12 hrs and then, still in the mould, get the temperature up to 70 degrees for a few hrs. You would then demould it (so that you don't need a mould that can take very high temperatures) and then put the part in an oven and the gradually ramp the temperature up to 180 degrees C. This type of post cure would ensure that the next time the part is at 180 degrees (when it's on your bike for example) that it won't be affected at all by the heat.
All the best, Matt
Matt Statham Easy Composites / Carbon Mods - Technical Sales
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