Sightglass made of BOROFLOAT® 33 glass.

Mechanical Properties

Strength through stability

Abrasion and scratch resistance, in combination with bending strength, are the basic foundations of the mechanical stability of BOROFLOAT® glass. These properties are particularly critical when high pressure and mechanical loads play an important role. The material’s low inherent weight makes it ideal for lightweight glazing and applications in modern high-tech facilities. In addition to safety and functionality, the weight of specialty glass components used in such facilities is critical.

Key benefits:

Excellent mechanical strength
  • Low weight
  • Strong resistance to abrasion and scratches
  • High elasticity
Mechanical properties
Density ρ (25 °C)
2.23 g/cm3
Young’s Modulus Ε (according to DIN 13316) 64 kN/mm2
Poisson’s Ratio μ (according to DIN 13316) 0.2
Knoop Hardness HK 0.1/20 (according to ISO 9385) 480
Bending Strength σ (according to DIN 52292 T 1) 25 MPa
Impact resistance
The impact resistance of BOROFLOAT® 33 depends on the way it is fitted, the size and thickness of the panel, the type of impact involed, presence of drill holes and their
arrangement as well as other parameters.

Reference values, not guaranteed values.
Critical forces
Material Mean value FC [mN]
Stadev.* [mN]
BOROFLOAT® 33 363.8 4.3
Other borosilicate glass 271.2 1.9
Soda-lime flat glass 214.4 4.6
Summary of critical forces in Scanning-Scratch-Test.
*Standard deviation
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