Who the standard reaches
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The limits are written about employees
No employee exposed above the PEL, no employee above the STEL. The duty runs to an employer and the protected person is somebody at work.
Which makes a teacher the protected person
Not the class. A teacher handling specimens across many lessons, in the same room, with the storage cupboard in it, is the person whose eight hour average is at issue.
And the students are protected indirectly
By the same controls, because air in a room is shared. The standard happens to protect them without naming them.
The hazard communication side reaches further
Chemical manufacturers, importers, distributors and employers. A supplier selling preserved specimens into schools is inside it as a distributor rather than as an employer.
So the label obligation travels with the product
Which is why a specimen arrives labelled. The obligation that gets dropped is the one that attaches when a school transfers the specimen into its own jar.
A parent at home is outside all of it
No employer, no employee, no monitoring, no safety data sheet file. The regulation has nothing to say and the chemistry is unchanged.
Which is an argument for borrowing the standard voluntarily
The numbers are a published view of what exposure is acceptable. A household has no obligation to meet them and no reason to ignore them.
The practical home version
Keep the quantity small, keep the vessel sealed, open it in a ventilated space, and put it away where it is not reachable. That is the standard translated into a kitchen.
And it is mostly a container decision
Small, sealed, and not reachable are three properties of a container and a cupboard. No part of the home version requires equipment.
What a supplier should do with this
Tell a school buyer which tier applies and why, and tell a parent buyer that no rule reaches them and here is what the rule says anyway. Both are useful and only one is a compliance conversation.