Schott Robax vidros especiais vidros vidro para lareira vidro resistente ao fogo vidros para churrasqueira vidro cerâmica 18 4. Acid resistance class according to DIN 12 116: min. 3 The glass surface to be tested is boiled for six hours in 20 % hydrochloric acid and the weight loss is determined in mg/100 cm2. The glass is then classified into the following acid classes: 4.4.3 Acid resistance 4.4.4 Resistance to attack by alkaline solutions 4.4.5 Surface modifications occurring during use Alkaline solution resistance class according to ISO 695: A2 To determine resistance to attack by alkaline solutions, glass surfaces are exposed for three hours to a boiling aqueous solution comprising equal quantities by volume of sodium hydroxide (NaOH) and sodium carbonate (Na2CO3), after which the weight loss is determined. The alkali classes are grouped as follows: ROBAX® has a high degree of resistance to surface attack. In individual cases, however, surface modifications may occur under critical conditions, e.g. corrosive combustion gases (formation of acid at high temperatures). Practical tests must be carried out before use in such applications. Acid class Description 1 acid resistant 2 slight acid attack 3 moderate acid attack 4 high acid attack Alkali class Description A 1 slight alkali attack A 2 moderate alkali attack A 3 high alkali attack Schott Robax vidros especiais vidros vidro para lareira vidro resistente ao fogo vidros para churrasqueira vidro cerâmica 19 4. UV-C UV-B UV-A visual Transmission 280 315 400 250 275 300 325 350 375 400 425 450 Transmission 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 4.5 Optical properties 4.5.1 Transmission ROBAX®, 3 mm 4.5.2 Transmission ROBAX®, 3 mm, in UV range This graph is based on data from individual measurements. Deviations may result from manufacturing processes. This graph is based on data from individual measurements. Deviations may result from manufacturing processes. Wavelength in nm Wavelength in nm 1.00 0.90 0.80 0.70 0.60 0.50 0.40 0.30 0.20 0.10 0.00 1.00 0.90 0.80 0.70 0.60 0.50 0.40 0.30 0.20 0.10 0.00