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Well, first off, BOCA isn't the "current" code in most areas of the country anymore, so I'd first confirm that it's the right code to be referencing.
I'd start with the manufacturer's specs for the anchors you're considering- most manufacturers like Hilti have specs on all their products, listing what codes they're accepted by, and usually listing reports and tests on their suitability. That being said, I can't say that I've seen plastic anchors used to support ceiling grid- it's usually lead shields or pins set with a powder-actuated fastener.