Chemical Properties

High resistance right down the line

Acids, alkalis and organic substances have virtually no negative impact on BOROFLOAT^®glass. Its high resistance to water is another important performance benefit for many industrial applications. Highly sensitive measuring instruments used, for example, in medical and analytical technologies to provide accurate, and at times critical, readings can be negatively influenced if not adequately protected. The outstanding hydrolytic stability of BOROFLOAT^® glass has cemented its position as the specialty glass of choice for laboratories everywhere, including in the chemical industry.
In complex products such as bio-chips, DNA- sequencers and inspection panels for reaction tanks, the superior powers of resistance of BOROFLOAT^® have become indispensable in research and industry. Its low yet extremely stable alkali content make it the ideal material for hi-tech, technically challenging applications.

Key benefits:

High chemical durability

High hydrolytic resistance
Excellent resistance to acids
High resistance to alkalis
Low alkali diffusion

Chemical resistance
Water resistance	(according to ISO 719 / DIN 12 111) (according to ISO 720)	HGB 1 HGA 1
Acid resistance	(according to DIN 12 116)	1
Acid resistance	(according to ISO 1776)	≤ 100 μg Na₂O per 100 cm²
Alkali resistance	(according to ISO 695 / DIN 52 322)	A 2

Corrosion test for Display Glass
Reagent 24 h at 95 °C	Abrasion [mg/cm²]	Visual observations
5 Vol.% HCl	< 0.01	Unchanged
0.02 n H₂S0₄	< 0.01	Unchanged
H₂0	< 0.01	Unchanged
6 h at 95 °C
5 % NaOH	1.1	White stains
0.02 n NaOH	0.16	White haze
0.02 n Na₂CO₃	0.16	Unchanged
20 min. at 23 °C
10 % HF	1.1	Stained white haze
10 % NH₄F x HF	0.14	Unchanged
Chemical resistance of BOROFLOAT^® 33 to selected reagents