Plastics and mashing

[NormandieStill]

So I was gearing up to place an order for some 32l PP food-grade buckets for mashing and fermenting so that I can ferment multiple washes simultaneously. While price-comparing I stumbled upon the "Certificate of Conformity" which states that the bucket is safe for food contact without chemical migration at 20C for over 24hrs, at 70C for 2 hours, or 100C for 15 minutes.

A corn-based mash (HBB is my current target) requires that the mash sit at near 100C for a couple of hours and again at a little under 70C for another couple, which would suggest that there is a risk of chemical leeching into the mash from the bucket. (For the record, these are the standard brewing buckets with lids sold by most European home brew shops.)

Have I just taken the HD plastic attitude to a whole new level, or should I be preparing my second 30l keg as a mash tun?