In section C, the definitions of groups of chemical elements are as follows:
Alkali metals: Li, Na, K, Rb, Cs, Fr
Alkaline earth metals: Ca, Sr, Ba, Ra
Lanthanides: elements with atomic numbers 57 to 71 inclusive
Rare earths: Sc, Y, Lanthanides
Actinides: elements with atomic numbers 89 to 103 inclusive
Refractory metals: Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, W
Halogens: F, Cl, Br, I, At
Noble gases: He, Ne, Ar, Kr, Xe, Rn
Platinum group: Os, Ir, Pt, Ru, Rh, Pd
Noble metals: Ag, Au, Platinum group
Light metals: alkali metals, alkaline earth metals, Be, Al, Mg
Heavy metals: metals other than light metals
Iron group: Fe, Co, Ni
Non-metals: H, B, C, Si, N, P, O, S, Se, Te, noble gases, halogens
Metals: elements other than non-metals
Transition elements: elements with atomic numbers 21 to 30 inclusive, 39 to 48 inclusive, 57 to 80 inclusive, 89 upwards
Section C covers:
pure chemistry, which covers inorganic compounds, organic compounds, macromolecular compounds, and their methods of preparation;
applied chemistry, which covers compositions containing the above compounds, such as: glass, ceramics, fertilisers, plastics compositions, paints, products of the petroleum industry. It also covers certain compositions on account of their having particular properties rendering them suitable for certain purposes, as in the case of explosives, dyestuffs, adhesives, lubricants, and detergents;
certain marginal industries, such as the manufacture of coke and of solid or gaseous fuels, the production and refining of oils, fats and waxes, the fermentation industry (e.g., brewing and wine-making), the sugar industry;
certain operations or treatments, which are either purely mechanical, e.g., the mechanical treatment of leather and skins, or partly mechanical, e.g., the treatment of water or the prevention of corrosion in general;
metallurgy, ferrous or non-ferrous alloys.
In the case of operations, treatments, products or articles having both a chemical and a non-chemical part or aspect, the general rule is that the chemical part or aspect is covered by section C.
In some of these cases, the chemical part or aspect brings with it a non-chemical one, even though purely mechanical, because this latter aspect either is essential to the operation or treatment or constitutes an important element thereof. It has seemed, in fact, more logical not to dissociate the different parts or aspects of a coherent whole. This is the case for applied chemistry and for the industries, operations and treatments mentioned in Notes (1)(c), (d) and (e). For example, furnaces peculiar to the manufacture of glass are covered by class Fulltext... Hierarchy... Expanded...C03 and not by class Fulltext... Hierarchy... Expanded...F27.
There are, however, some exceptions in which the mechanical (or non-chemical) aspect carries with it the chemical aspect, for example:
Photographic materials and processes, in class Fulltext... Hierarchy... Expanded...G03, and, generally, the chemical treatment of textiles and the production of cellulose or paper, in section D.
In still other cases, the pure chemical aspect is covered by section C and the applied chemical aspect by another section, such as A, B or F, e.g., the use of a substance or composition for:
When the chemical and mechanical aspects are so closely interlocked that a neat and simple division is not possible, or when certain mechanical processes follow as a natural or logical continuation of a chemical treatment, section C may cover, in addition to the chemical aspect, a part only of the mechanical aspect, e.g., after-treatment of artificial stone, covered by class Fulltext... Hierarchy... Expanded...C04. In this latter case, a note or a reference is usually given to make the position clear, even if sometimes the division is rather arbitrary.
CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
This group covers also compositions which are intended to be heated sufficiently for their ingredients to fuse into a glass, e.g. glass furnace charges. [4]
containing two or more distinct frits having different compositions [4]
C03C 8/24
·
Fusion seal compositions being frit compositions having non-frit additions, i.e. for use as seals between dissimilar materials, e.g. glass and metal; Glass solders [4]
P:120
C03C 10/00
Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition [4]
C03C 10/02
·
Non-silica and non-silicate crystalline phase, e.g. spinel, barium titanate [4]
C03C 10/04
·
Silicate or polysilicate crystalline phase, e.g. mullite, diopside, sphene, plagioclase [4]
C03C 10/06
· ·
Divalent metal oxide aluminosilicate crystalline phase, e.g. anorthite, slagcerams [4]
C03C 10/08
· · ·
Magnesium aluminosilicate, e.g. cordierite [4]
C03C 10/10
· ·
Alkali metal aluminosilicate crystalline phase [4]
C03C 10/12
· · ·
Lithium aluminosilicate, e.g. spodumene, eucryptite [4]
C03C 10/14
·
Silica crystalline phase, e.g. stuffed quartz, cristobalite [4]
Surface treatment of glass; Surface treatment of fibres or filaments from glass, minerals or slags
C03C 15/00 - C03C 25/00
Note(s)
Treatment of materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone is classified in subclass Fulltext... Hierarchy... Expanded...C04B. [4]
P:40
C03C 15/00
Surface treatment of glass, not in the form of fibres or filaments, by etching (etching or surface-brightening compositions, in general Fulltext... Hierarchy... Expanded...C09K 13/00) [2]
C03C 15/02
·
for making a smooth surface
P:50
C03C 17/00
Surface treatment of glass, e.g. of devitrified glass, not in the form of fibres or filaments, by coating (optical coatings of optical elements Fulltext... Hierarchy... Expanded...G02B 1/10)
at least one coating being a coating of an organic material [3]
C03C 17/40
· · ·
all coatings being metal coatings [3]
C03C 17/42
· ·
at least one coating of an organic material and at least one non-metal coating [3]
C03C 17/44
·
Lustring [3]
P:60
C03C 19/00
Surface treatment of glass, not in the form of fibres or filaments, by mechanical means (sand-blasting, grinding, or polishing glass Fulltext... Hierarchy... Expanded...B24)
P:30
C03C 21/00
Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals into the surface
P:70
C03C 23/00
Other surface treatment of glass not in the form of fibres or filaments
P:20
C03C 25/00
Surface treatment of fibres or filaments from glass, minerals, or slags
C03C 25/10
·
by coating [7]
C03C 25/12
· ·
General methods for coating; Devices therefor [7]
C03C 25/14
· · ·
Spraying [7]
C03C 25/16
· · ·
Dipping [7]
C03C 25/18
· · ·
using extrusion devices [7]
C03C 25/20
· · ·
Contacting the fibres with applicators, e.g. rolls [7]