Wrinkled Celotex - indicative of an issue?

Just taken delivery of a number of Celotex GA4000 PIR insulation boards and , as shown in the photo below, the 100mm boards in the foreground are extre mely wrinkled one foil face, particularly when compared with the completely smooth 30mm and 12mm boards in the background:
http://www.newtonnet.co.uk/permanent/celotex.jpg
The 100mm boards also have an ever so slight bow to them; not enough to cau se me an issue but I wondered if the bowing and wrinkles were the result of differential shrinkage within the core?
Any cause for concern?
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On 13/03/2019 20:49, Mathew Newton wrote:

been left out in the cold thats all.
delta expansion coefficients
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On Wednesday, 13 March 2019 21:15:10 UTC, The Natural Philosopher wrote:

Okay, that's reassuring.
I thought the first response was going to be an straight up "Shocking. I wouldn't even accept them as seconds!" or something along those lines!
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And leaned against a wall probably, if they are bowed. I often wonder though, if these insulation panels are supposed to insulate, how come they can show this sort of effect if cold on one side, rather makes you wonder about their long term integrity. I cannot see the picture, but have heard of this before and it jogged my mind.
Brian
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On Wednesday, 13 March 2019 21:15:10 UTC, The Natural Philosopher wrote:

and, as shown in the photo below, the 100mm boards in the foreground are e xtremely wrinkled one foil face, particularly when compared with the comple tely smooth 30mm and 12mm boards in the background:

cause me an issue but I wondered if the bowing and wrinkles were the resul t of differential shrinkage within the core?

Well, if that's so, they will flatten out spontaneously as they equalise.
I have had lots of this insulation and never seen this sort of thing. I have never seen visible expansion. I have seen concave edges but not enough to matter.
It's closed cell structure so shouldn't absorb water either.
It may not matter, depending on application and how small you are cutting i t up.
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On 13/03/2019 20:49, Mathew Newton wrote:
I thought you were talking about /cellulite/ until I re-read the subject line (a female preoccupation that appears to have been invented in the late 60s).
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Nope, just named then.
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On 14/03/2019 01:06, Rod Speed wrote:

'...in the late 1960s, with the earliest reference in Vogue magazine, "Like a swift migrating fish, the word cellulite has suddenly crossed the Atlantic."' - Wikipedia
...so no-one bothered about it until someone invented a word for it.
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Wrong, as always. And crossing the atlantic isnt inventing anyway.
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On 13/03/2019 20:49, Mathew Newton wrote:

Not at all IMHO.
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On 13/03/2019 20:49, Mathew Newton wrote:

My only concern would be damage to the wrinkles, which of course would make the foil face porous.
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On Wednesday, 13 March 2019 20:49:27 UTC, Mathew Newton wrote:

nd, as shown in the photo below, the 100mm boards in the foreground are ext remely wrinkled one foil face, particularly when compared with the complete ly smooth 30mm and 12mm boards in the background:

ause me an issue but I wondered if the bowing and wrinkles were the result of differential shrinkage within the core?

slight wrinkling like that is immaterial
NT
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On Wednesday, 13 March 2019 20:49:27 UTC, Mathew Newton wrote:

ause me an issue but I wondered if the bowing and wrinkles were the result of differential shrinkage within the core?

Thanks everyone for the comments. It seems the vast majority thought it was a non-issue. I heard back from Celotex Technical Support and they said:
'In regards to the facer issue occasionally the facer can have a crinkled a ppearance as a result of the manufacturing process but should be consider t o be an aesthetic issue only. Whilst the visual appearance of these boards is not aesthetically pleasing they continue to be suitable. The thermal val ue and structural integrity of the boards is unaffected and they remain fit for their intended purpose as thermal insulation.'
The supplier said similar and they also offered to replace any bowed boards should they be a problem for my application but the bowing is only slight (<10mm over the full length) and so I don't think that'll be necessary.
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