CLC stands for Color Laser Copiers. These are the bigger machines usually used bycopy shops like Kinko's, etc. Nowadays, these machines are what they call the digital copiers/printers and are now able to print directly from your PC. Oil based CLCs uses oil on the fuser section and operates at lower fusing temperature. They are the ones usually used by graphic printing companies because the color output are more consistent. Usually, they have a RIP processor/software attached to them. The machines usually comes from such companies like Fuji-Xerox, Canon, Konica-Minolta, etc. Transfer papers used on oil based CLCs are the cheapest one and comes in A3 or 11x17 sizes. An example of this paper is the Photo-trans Plus (and the Photo-trans Plus SC) from Neenah paper company. The Duracotton-oil transfer paper is also designed for oil based CLCs only, and same goes to the Forever Classic from Forever Germany. With the advent of smaller non-oil based laser printers/copiers (cheaper and smaller than oil based CLCs), manufacturers came up with transfer papers which can also be used on higher fuser temperature (non-oil based CLCs operate at this higher temperature). Thus came the Techniprint (from Neenah), Duracotton-OIL, and the Forever-Classic Universal and Forever-Fivestar Universal. These papers are a bit more expensive, but can be used on both oil and non-oil based laser printers. You can also check-out the Neenah website,
forever-ots.com, and
prodistributors.com for a list of some compatible laser printers. I have noticed that the OKIs are becoming popular for transfer paper printing so you might want to check that out also.