Howard and Brian,
I would be interested in where you are using it. At present my throttle cable routes through the back and runs up through my bundle of snakes and touches one pipe. I tried an experiment with some heat sleeve from another manufacturer and spare cable I had and the plastic on my slave cable melted.
Funnily enough I have been talking to AB asking about their product this is the response I got so I'm still not sure if a reroute to the side for the throttle cable would be best.
From Adrian Brookes - VP & General Manager
AB Technology Group
This sleeve probably won't do the job you are hoping for.
You may have success with our S-FS sleeve, which has a coating. Depending on how you route the sleeve, one end of it could be in an airflow area that is cooler and airflow can travel down the sleeve, keeping the inside cooler than the outside. You don't need much airflow - and also keep both ends of the sleeve open to allow the flow.