I bet you are an eBay sellers dream customer - you accept everything these guys serve you up, without an element of questioning, something I find very odd from an Industrial chemist.
I'm perfectly aware that aluminium has been used in engines for years, and when it is, men with slide rules sit and work out how big the thing needs to be to do the job.
I look a photos of ally rads next to copper rads, and see what appears to be an identical number of tubes and fin spacings, well that doesn't tie up with the material specs -
The corrosion issue is quite relevant - more to the point, the choice of coolant used is critical, again, as a chemist, you already know that.
I'm not prejudiced, however it makes me puke to watch engineering co's go broke because the chinese take every last thing they make and copy it. The chinese are quite happy to subsidize sales at a loss until they have a full market share - intellectual property rights mean nothing to them, and I come from a time where there is an element of fair play in business.
Not one of the radiators that I have seen for sale from between £40 - £60 including shipping, duty, profit and VAT looks the part, they are clumsily formed up, and the TIG welding looks like an arc strike block - my engine bay is hardly concourse but what on earth would I want to bolt something so terrible looking in it for?
Radtec are a completely different ball game, just look and see for yourself, but then the price if around 5 times more expensive, I wonder why?