I didnt know there were special types either - i usually just put them through - though its to something i need to do often...
mind you, my printer is a deskjet - so not sure if it even has a laser?
or do they all have lasers?
i would suggest feed one through and see if it spoils them
id have thought the heat would not get chance to get that hot because its only a few lines of small text and is out of the machine in a few seconds... i know if you print a photo it can get qute warm
but wouldnt it just stick them together? if you folded them shut before feeding...?
theres not enough glue, usuall,y to leak out onto the rollers is there?