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What does BNTN stand for?

BNTN stands for Bentonite (lithological term)

This definition appears very rarely

Samples in periodicals archive:

The Grundomudd uses a Venturi mixer/filtration system to mix water and bentonite in a matter of minutes, while an in-tank recirculating valve keeps that mixture from settling.
In the core room, S&B Industrial Minerals supplies application proven core sand additives that positively influence both the core and the bentonite bonded molding sand.
The clues for such a large eruption 454 million years ago come from layers of soft rock called bentonite that appear frequently in deposits from Earth's Ordovician period.