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Metallum alloys sunt cum praecisione materiae corporalis proprietatibus speciali (ut magnetica, electrica et proprietatibus scelerisque). Ingens major cura alloys sunt secundum ferrea metalla transcurrit, et pauci sunt, fundatur super non-ferrea metalla transcurrit. Magneticae plerumque includit alloys (videatur magnetica materiae), alloys partibus constans: expansion alloys, bimetals scelerisque, electrica alloys, hydrogenii repono alloys (videatur hydrogenii repono materiae), memoriam figura alloys, magnetostrictive alloys (videatur magnetostrictive materiae), etc.
Subtilitas alloys sunt genera dividitur, in VII secundum diversas proprietatibus corporis, nimirum: mollis magnetica alloys, deformis positio eius permanens magnetica admixtos, elasticum alloys, expansion alloys, scelerisque bimetals adiciatur, sisti alloys et thermoelectric alloys.
Mollis magnetica alloys: Permalloy LXXX (Mumetal); 1J79 (Alloy LXXIX); 1J85 (Alloy LXXXV); Hiperco 50A
Alloys partibus constans: 3J58,3J53, 3J01 Eect
Expansion alloys: Kovar Alloy (4J29), Invar XXXVI (4J36), Super Invar (4J32), Alloy XLII (4J42), Alloy L (4J50) Ect
| 4J36 | INVAR | 4J48 | K94800 | |
| 4J42 | K94100 | 4J46 | K94600 | |
| 4J50 | Alloy52 | 1J79 | HyRa80 | |
| 4J29 | KOVAR | 1J85 | Super-permalloy | |
| 4J32 | Super-invar | 1J50 | HyRa50 | |