32550 - Clay refractories
3255011 - - Brick & Shapes: Fireclay (+ Semisilica) brick & Clay
3255015 - - Brick & Shapes: Superduty fireclay brick & Shapes
3255016 - - Bloating & Super-duty fire clay refractory bricks & Shapes
3255022 - - Brick & Shapes: High alumina brick & Shapes + High alumina ladle brick, containing =>50% alumina
3255023 - - Insulating fire brick & Shapes: 2300F-2800F
3255024 - - Insulating fire brick & Shapes: =>2800F
3255025 - - High alumina refractory bricks & Shapes, incl High alumina ladle bricks
3255026 - - Insulating fire brick & Shapes: 1600F-2000F
3255027 - - Insulating fire brick & Shapes: 2000F-2300F
3255031 - - Bloating fireclay ladle brick
3255033 - - Pouring pit refractories, Fire clay & High alumina
3255035 - - Insulating refractory fire bricks & Shapes, Below 2600 degrees F
3255037 - - Insulating refractory fire bricks & Shapes, 2600 degrees F or higher
3255041 - - Clay refractories: Hot top refractories & Glass pots, Tank blocks, Feeder pots & Upper structure shapes used only for Glass tanks
3255042 - - Fireclay pouring pit refractories + Sleeves, Nozzles, Runners, Tuyeres & Ladle gate parts
3255043 - - High alumina pouring pit refractories, =>50% alumina + Sleeves, Nozzles, Runners, Tuyeres & Ladle
3255045 - - Glass-house pots, Tank blocks, Feeder parts & Upper structure shapes used only for Glass tanks
3255047 - - Hot top refractories
3255049 - - Clay kiln furniture, Radiant heater elements, Potters' Supplies & other Miscellaneous shaped refractory items
3255055 - - Unshaped clay refractories: Refractory bonding mortars wet & Dry, <50% alumina
3255057 - - Unshaped clay refractories: High alumina bonding mortars, Wet & Dry, =>50% alumina to be made predominantly of Bauxite, Kyanite, etc.
3255061 - - Plastics refractories & Ramming mixes, <50% alumina
3255064 - - High alumina plastics refractories & Ramming mixes, =>50% alumina
3255065 - - Castable refractories (Hydraulic setting): Castable refractories (Hydraulic setting) <50% alumina
3255066 - - Phosphate bonded high alumina, Plastics & Ramming mixes, =>50% alumina
3255067 - - Castable refractories (Hydraulic setting): High alumina castable refractories (Hydraulic setting) =>50% alumina
3255069 - - Insulating castables (Hydraulic setting - Density-105 lb/cu ft)
3255070 - - Insulating gunning mixes (Hydraulic setting)
3255071 - - Fireclay gunning mixes (+ Hydraulic setting gunning mixes) <50% alumina
3255075 - - High alumina gunning mixes, =>50% alumina to be made predominantly of Bauxite, Kyanite, Andalusite & Similar
3255085 - - Clay & High alumina refractory materials
3255092 - - Clay refractory materials sold in lump or Ground form: Clay refractory materials, <50% alumina + Crude clays, Calcined clays, Ground fire brick, etc.
3255093 - - Clay refractory materials sold in lump or Ground form: High alumina refractory materials, =>50% alumina to be made predominantly of Bauxite, Kyanite & Andalusite, etc.
3255095 - - Clay & High alumina refractory raw materials
3255097 - - Clay refractory raw materials, <50% alumina (+ Crude clays, Calcined clays, Ground fire brick, etc.
3255098 - - High alumina refractory raw materials, =>50% alumina to be made predominantly of Bauxite, Kyanite, etc.
3255099 - - Clay refractories (Miscellaneous)
3255XX0 - - Clay refractories (Bulk)
3255XX2 - - Clay refractories (Miscellaneous - Speciality)