heat pad and plastic enclosure

[Rimshot]

is it ok to use a heat pad on a plastic enclosure, even though the heat pad intructions says to be used on glass terrariums only? i'm planning on using it on a 40 litre plastic storager container, if i get a ball python. do you all think thats ok? have u tried it without any problems?
any suggestions?
thanks

[adam2373]

If you put it on a rheostat and use a thermometer it should be fine.

[mykee]

I agree, any temperatures that you would require to heat a ball python would do no damage to a rubbermaid.