Occasionally customers require Material Safety Data Sheet (MSDS) for their file. OSHA requires MSDS sheets to be available for chemicals in the workplace that employees may be exposed to during normal operations, storage or in an emergency. We use water test strips that do not dissolve are falling under an exception from these requirements.
There's also an article (CFR1910.1200 (b)(6)(v), and paragraph (c)) where test strips fall under. This article defined as an item that is formed to a specific shape during manufacture that depends upon that shape to function. It also releases trace amounts of a hazardous chemical (as defined in paragraphs (d) and (g) of the section) and does not pose a health risk to employees. These articles DO NOT require MSDS sheets.