I'm using PEX pipes for water tubing, but I'm not sure which sleeve type should I use for hot and cold water pipes.
Whats the difference between black, blue and red sleeves? and which should I be using for hot and cold water pipes
The color is just for convenience. Making it easy to identify hot and cold pipes under a house for instance. The chemical makeup and temperature ratings are identical besides the actual dye used to color it.
Color coding is an international mess. The only thing that's somewhat common is that purple means nonpotable water.
In residential plumbing, blue often means potable. Sometimes red means heated but that's still vague since there's a big difference between 120 °F and 212 °F.
Here's my policy: