I made potato chips by following this recipe, but they didn't come out crispy.
What is the accurate temperature for frying chips?
Note (from Jefromi): my best guess based on the comments is that the OP didn't use this recipe, but rather fried thin potato slices in a deep-fryer at 180C, in an unknown oil, for an unknown amount of time. If this is enough to let you answer, just go for it.
Best Answer
Speaking as a Brit - we are a nation of chip lovers :)
Use an oil which can cope with the high temperature such as groundnut. For that proper chip experience (* heart attack alert *) add some beef dripping or lard. I add a small amount to give the chips a nice flavour.
Whilst heating the oil regulary dip a chip in the oil. When it starts to bubble then it's time to cook. If the oil is too cold the chips will absorb it and they'll go soggy. (This is easier to achieve with a traditional chip pan or I prefer a deep saucepan).
For the perfect chip the potato variety is important but this is personal taste. Last seasons reds will make dark delicious chips but I prefer new potatoes which make a crisper lighter coloured chip. (The potato variety also affects the colour when cooked).
Finally, drain on kitchen paper and a sprinkle of salt.