I am using Adtech 820 resin with the 823 hardener. What kind of heat can this resin resist? I am hoping to make a motorcycle exhaust guard but I don’t want the part to be destroyed once in use. Any advise would be great!
Adtech 820/823 has a heat deflection temperature of 180F. You will need to heat treat your part to at least 150F for 4 hours to get there…at least according to Adtech. Typically you want to heat cure the part to at least to the expected operating and often above.
I suspect that you won’t get a much higher HDT by heat curing at higher temps. than 180F though. 180F HDT seams to be this resins max.
I’d recommend curing the part in the mold if your mold can take it. Heat treating after the part is demolded often leads to fabric print-thru.
I’d make one, heat treat, mount it to the bike, take a nice long ride, and see what happens. 
Ok thanks. I don’t think that is even close to the temp of a motorcycle exhaust. What infusion resins are available and will withstand high temps?
I’d say where the guard is going to be fitted will affect its ability to cope with heat, is it a crash guard for the end can on a sportsbike? and exhaust gasses can easily get hot enough to glow a pipe cherry red at the header, further down it cools down a fair bit, but even carbon race cans will be affected by gas temp and exhaust pulses(especially on v-twins) over time
Usually high temp epoxy resins are difficult to infuse because the viscosity is typically pretty high. This is the reason most high temp parts are made with prepreg/autoclave or assisted hand layups.
I’ve seen plastic used for exhaust guards. Can you measure the temps in the area?
If the exhaust gets really hot, line the guard with aluminium on the hot side, and keep a 1/4" or so between the exhaust and the guard. The largest problem is when using the bike hard, then stopping. No cooling from an airstream anymore.
Im going to make a mold and then make an exhaust guard and do some testing. Ill try lining the back with some heat guard and see how it goes
huntsman araldite my721, tg 450f. Thick as bugger at RT, but infuses well at 150-170f, cure at 350f.
I agree, it does sound a bit like a ‘quick fix’ solution.Surely you can never be 100% absolutely certain that something won’t go wrong.
Banned!
Thanks for the heads up Herman!
It’s too bad too. I’m just about to graduate. I could have used his essay writing services a year ago.
If it smells like spam, looks like spam, and tastes like spam: It is SPAM!
Essay writing services are nice. I once had a friend, challenging for the Olympics (sailing) together with his brother.
His brother however wanted to bail out, to finish his studies:
-bro, I need to quit sailing.
-but we are going for the olympics!
-yes, but I need to graduate. I have been studying for way too long.
-what do you need to do for graduating?
-I need to write an essay.
-OK, I can see that. What was it about?
-Economics.
-Uhhh, let me think. I will write your essay, and you will sail with me for another 3 years.
-OK.
(And beware, the other brother had a degree in mechanical engineering, not economics. Still finished the essay in 4 weeks or so… Some people can do it all.)
Situation:
I’ve formed .025mm perforated aluminum sheets into motorcycle parts which are near the exhaust and engine. These aluminum parts are more then 1/4" from heat source. APPROXIMATE heat generated from engine/exhaust near these parts may reach up to 100 F:eek:
Question:
Can I cover perforated aluminum sheets with carbon fiber…err…
Will CF adhere to aluminum? 
Thanks in advance. I’m newly registered with absolutely no composite experience:cool:
100F? That is warm to the touch. Baby bath temperature. Are you sure?
Pretty sure he left off a 0.
Should have read…
“these parts may reach up to 100:eek:F!!!”
My Bad…The shielded exhaust definitely gets very HOT:eek:…But parts are already a good distance( >1 inch) from the shielded exhaust. In the summer the parts may reach 120F…I live on the cool:cool: coast line of California:D
Back to the original question: Will CF adhere to aluminum:confused:
Carbon fiber and epoxy will adhere to aluminum just fine…for awhile. 
Unfortunately, galvanic corrosion is the result. An insulator of some sort (glass fiber for example) must be placed between the two.
Get some sleep, then please rephrase, as I am lost. How hot do the parts get?
The exhaust reaches 600 F…my part is a good inch plus away …yawn .