North American Product Classification System (NAPCS) Canada 2017 Version 1.0
162 - Stone, sand, gravel, clay, and refractory minerals
This group comprises stone, sand, gravel, clay, and refractory minerals.
16212 - Sand, gravel, clay, and refractory minerals
This class comprises sand, gravel, clay, and refractory minerals.
162121 - Construction sand and gravel
This subclass comprises sand and gravel that has not been further processed than crushing, washing or screening.
162122 - Industrial sand
This subclass comprises industrial sand.
162123 - Clay and refractory minerals
This subclass comprises clay, and refractory minerals.
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