"Clay construction products" means brick, hollow structural tile, sewer pipe and kindred products, refractories, and other clay products such as architectural terra cotta, glazed structural tile, roofing tile, stove lining, chimney pipes and tops, wall coping, and drain tile. The term does not include non-structural bearing clay products as ceramic floor and wall tile, mosaic tile, glazed and enameled tile, faience, and similar tile, nor does the term include non-clay construction products such as sand-lime brick, glass brick, or non-clay refractories.
"Silica brick or other silica refractories" means refractory products produced from raw materials containing free silica as their train constituent.
Nothing in this section shall be construed as permitting employment of minors in any occupations declared hazardous by any other section of this subchapter.
Haw. Code R. § 12-25-50