The phrase "are only allowed for" is correct and usable in written English.
It can be used to specify restrictions or permissions regarding certain actions or items in various contexts.
Example: "Certain materials are only allowed for use in designated areas to ensure safety."
Alternatives: "are permitted only for" or "are restricted to".
Incidentally, my partner once looked into getting a civil union, and were dismayed to discover these are only allowed for same-sex couples.
Interband transitions under xy polarization are only allowed for the states with the same parity, whereas those under z-polarization are uniquely for states with opposite parities.
Instrument flight rules are only allowed for aircraft equipped with SCAT-I.
On the individual level, hormones such as gonadotropin releasing hormone and prostaglandins are only allowed for treatment of ovarian cysts or luteolysis [ 3].
According to Commission Regulation No. 1895/2005, BPF-containing resins are only allowed for food contact in 'heavy-duty coatings' for containers or storage tanks having a capacity greater than 10 000 litres and for pipelines belonging to them.
The current legal limit for a termination is 12 weeks, after which it is only allowed for certain "social" reasons, such as if the woman was raped or is a single mother.
It is a regulation that needs to be looked at because it encourages deception, just as in the old days when replacements were only allowed for someone who had been injured.
The school, which takes pupils from across London, was also told to stop citing attendance at a Catholic primary school as a criterion, as this is only allowed for designated feeder schools.
Moreover, OSA will be only allowed for those users located inside free primary activity areas.
In traditional systems, access to databases is only allowed for internal users via internal applications.
Acet is only allowed for horses that test positive for HYPP and have HYPP status noted on their registration papers.
