Glass apparatus and communication from the glass, working at low pressures (vacuum), should be at room or lower temperatures. 
Glass - chemically very stable material. Acids, except hydrofluoric, phosphoric, virtually no effect on the glass. However, there are no windows that would not react with the water and alkali. Prolonged exposure to alkalis on the glass is its leaching, changes in the composition, type and properties. Under the action of water is the hydrolysis of the glass, which resulted in a number of alkali and other soluble components goes into the water, they can be determined by titration with 0,01 HCl more acid matter na titration, the less resistant to water was glass. 
In relation to water glasses are five classes of hydrolytic. 
The class I include glass, almost immutable water (for titration of 1 liter of water is 0 .32 ml of 0.01 N. HCl) to Class V poor glass (for titration is 6.5 ml or more) to Class II are stable glass (0,32-0,65 ml) to the class III-solid hardware (0.65-2,8 ml) to the class IV-soft hardware glass (2,8-6.5 ml). 
Most of the silicate, commercially available, refer to the boundary of class II and III or early class III 
The greatest chemical resistance relative to the water and acidic aggressive media has quartz glass, for in relation to it, too, are unstable bases, like the other glass. For example, when exposed to silica glass with concentrated HCI (density 1.19 g/cm3) for 120ch at 20 ° C loss in weight of glass is 25 mg/cm3, and the action on the same glass of 1% NaCl solution for the same time and at the same temperature, loss in weight of 160 mg/cm2. 
Thus, the chemical resistance of glass is primarily determined by its composition: glass is chemically more stable with a high content of soluble aluminum oxides, boron, zinc, lead, magnesium, and less stable with a high content of easily soluble oxides of alkali and alkaline earth metal.