The tempered Glass always like 3mm or 4mm clear float glass or tempered
The standard size is 610mm*610mm ,457mm*610mm and 1422mm*730mm etc
Any size can be customized .
Greenhouse glass also named horticulture glass, which usually use clear or low iron toughened glass. A toughened glass greenhouse is the perfect choice for greenhouse gardeners that live in temperate climates like the UK, Holland, Italy, Belgium..where the greenhouse may be exposed to high winds.