firebrick=/=aac
ytong=aac
but aac=/=ytong
ytong is a brand name, aac is what the material actually is.
stop confusing them? luckly i am into formicaria, so i know what you are talking about, though.
I'm not sure how I'm being confusing. If you don't understand what I'm talking about then firebrick is
"A fire brick, firebrick, or refractory is a block of ceramic material used in lining furnaces, kilns, fireboxes, and fireplaces. A refractory brick is built primarily to withstand high temperature, but will also usually have a low thermal conductivity for greater energy efficiency. Usually dense firebricks are used in applications with extreme mechanical, chemical, or thermal stresses, such as the inside of a wood-fired kiln or a furnace, which is subject to abrasion from wood, fluxing from ash or slag, and high temperatures. In other, less harsh situations, such as in an electric- or natural gas-fired kiln, more porous bricks, commonly known as "kiln bricks", are a better choice.[1] They are weaker, but they are much lighter and easier to form and insulate far better than dense bricks. In any case, firebricks should not spall, and their strength should hold up well during rapid temperature changes."-taken from wikipedia
AAC(the actual name is Autoclaved airated concrete)
"Autoclaved aerated concrete (AAC) is a lightweight, precast, foam concrete building material suitable for producing concrete masonry unit (CMU) like blocks. Composed of quartz sand, calcined gypsum, lime, cement, water and aluminum powder, AAC products are cured under heat and pressure in an autoclave. Invented in the mid-1920s, AAC simultaneously provides structure, insulation, and fire- and mold-resistance. Forms include blocks, wall panels, floor and roof panels, cladding (façade) panels and lintels.[1][2]." -Also taken from wikipedia
Ytong is a company that makes AAC http://www.ytong.gr/
So as you can see, firebrick is not AAC. They are different. Therefore firebrick is also not ytong, which as I explained is the name of a company that makes AAC
Ytong is a company that makes AAC, so if you get ytong it is AAC. However all AAC are not ytong. More then one company will make AAC.