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Very interesting. Is the cracked unit double or triple glazed?
Which solar film did you use? How did it affect visible daylight entering the room?
ectoplasmosis-
It was a double. Being an old window from 1990, the units were only 16mm thick (4mm low E / 9mm spacer /3mm toughened clear ) . It was the inner 4mm that had the film on that cracked.
https://www.abodewindowfilms.co.uk/product/light-reflective-silver-window-film
It definitely blocks a noticeable amount of light when comparing the windows with/without. However I don't think this will be an issue in practice
user69121
A warning to anyone considering fitting any solar film onto a Velux window with genuine velux glass. Velux units have a history with cracking for no reason except varying temperatures
This unit is about 5 years old and decided to crack across the top third of the unit, on a fairly sunny day, only 3 days after adding the film. I think its highly possible the extra heating of the glass caused the failure. However the film worked well to keep the failed inner pane in one piece.
Fortunately I was planning on replacing another 34 year old original unit and adding the film, so i had already ordered a non genuine unit with 4mm Toughened glass inside and out.
No qualms about adding the film again onto this non velux unit as it definitely makes a difference to the rooms