Anthracite: often referred to as hard coal, is a hard, compact variety of coal that has a submetallic luster. It has the highest carbon content, the fewest impurities, and the highest energy density of all types of coal and is the highest ranking of coals.
Bakelite, the first plastic made from synthetic components.
Taħlita ta’ xema’ u terpentina li ilha tintuża għal mijiet ta’ snin biex biha jissiġillaw dokumenti jew ittri li huma sigrieti jew ta’ importanza. Din ix-xema’ tiddewweb fuq id-dokument milwi u magħluq u mbagħad iċ-ċeralakka tkun immarkata bis-siġill bħala prova li d-dokument ma jkun fetħu ħadd sakemm jasal għand min għandu jasal.
Sors: Bejn Kliem u Storja
Brownish substance made from amber from which certain varnishes are maid.
Cordite: Cordite is a family of smokeless propellants developed and produced in the United Kingdom since 1889 to replace gunpowder as a military propellant. Like gunpowder, cordite is classified as a low explosive because of its slow burning rates and consequently low brisance. These produce a subsonic deflagration wave rather than the supersonic detonation wave produced by brisants, or high explosives.
Lead glass, commonly called crystal, – a variety of glass in which lead replaces the calcium content of a typical potash glass. Lead glass contains typically 18–40% (by weight) lead(II) oxide (PbO), while modern lead crystal, historically also known as flint glass due to the original silica source, contains a minimum of 24% PbO. Lead glass is desirable owing to its decorative properties.
Flint glass: an optical glass that has relatively high refractive index and low Abbe number. Flint glasses are arbitrarily defined as having an Abbe number of 50 to 55 or less. The currently known flint glasses have refractive indices ranging between 1.45 and 2.00.
Polished plate glass: a type of hand-made glass. It is produced by casting glass onto a table and then subsequently grinding and polishing the glass.
Hammered glass: rolled glass made nontransparent by embossing it on one side to resemble beaten metal.
Cathedral glass: the name given commercially to monochromatic sheet glass. It is thin by comparison with slab glass, may be coloured, and is textured on one side. The name draws from the fact that windows of stained glass were a feature of medieval European cathedrals from the 10th century onwards.
Sandblasted glass: is produced by bombarding the glass surface with small hard particles to create a frosted aesthetic.
Carbon black (subtypes are acetylene black, channel black, furnace black, lamp black and thermal black) is a material produced by the incomplete combustion of heavy petroleum products such as FCC tar, coal tar, or ethylene cracking tar.
A piece of glass. A pane of glass.
Plural: Ħġieġ, ħġieġet