Currently I'm using standard butyl inner tubes on my clincher carbon wheels. My bike uses rim brakes, and searching on internet I have found that carbon rims are not great for dissipating heat:
During sustained and hard braking both the rim brake track surface and the pad surfaces can reach +200°C (+392°F). If the rim brake track is not 100% flat and smooth, wide spots in the brake track can concentrate heat up to 250°C (+482°F) in the area between the rim hooks, which also heats the inner tube which is getting into the realm of the resin failing/melting.
Full Carbon Fiber rims should be used in racing situations ONLY, as well as configured as a tubular. (OMG!)
I also have found some info in regards to heating on latex inner tubes:
However, being thinner, Heasman explained, “latex tubes are more prone to heat fluctuations and will likely blow out sooner than a butyl tube on heated rims through prolonged braking”.
Bear in mind that if you are faced with a long, wet or particularly technical descent, you may have no choice but to drag the brakes.
Heasman points out that this is a potential advantage “with disc brakes, where rim heat is irrelevant”.
A latex tube is also known to be somewhat delicate and susceptible to greasers and degreasers, ammonia and solvents, direct prolonged sunshine and high heat, all which may contribute to damaging its properties. These agents, light and heat must be avoided as much as possible.
So I was thinking on giving an opportunity to latex inner tubes, but I'm really worried about how safe that would be when combined with rim brake carbon wheels. How safe would that be on flat rides or short descents (e.g 1000m at -7%)? and on a long descent (e.g 11km at -10%)?
(To add some more fear to the mixture, I also found this heat test by Alto)