N-BK7

N-BK7

N-BK7 - Quartz glass for optical windows and lenses

Material: N-BK7 / S-BSL7

N-BK7 is an exceptionally pure and universally applicable optical glass. Its high quality makes it one of the most commonly used glasses for the production of high-quality optics. It is particularly suitable as an optical window for technical applications due to its favourable physical properties.

  • N-BK7 (Schott)
  • S-BSL7 (Ohara)

Applications

Borosilicate glass (borosilicate crown glass N-BK7, S-BSL7) is a key material in the manufacture of high-quality optical components due to its exceptional purity and versatility. These glasses are characterised by their outstanding optical quality, which makes them the preferred materials for the manufacture of lenses, prisms and plano glasses. Their physical properties, including high quality and uniform transmission in the visible wavelength range, make them particularly suitable for optical windows in technical applications. The ability of N-BK7 to be polished like lead glazing and its high resistance to staining without special pre-treatment emphasise the advantages of these materials in precision optics.

Optical properties of borosilicate glass and its application

N-BK7 borosilicate glass offers uniform transmission and low absorption over the entire visible wavelength range, making it a key element in the manufacture of sophisticated technical optics. Its excellent optical quality and virtually colourless appearance enable the manufacture of precision optics that can be used in a wide range of applications, including sophisticated technical optics, optical windows and substrates for mirror and filter coatings. The high homogeneity and low content of bubbles and inclusions contribute to the high quality of the end products, while the good light transmission in the visible and near infrared spectrum maximises the efficiency of the optical systems.

Chemical and physical stability of borosilicate glass

The chemical properties of N-BK7 are remarkably stable, making the glass scratch and corrosion resistant. This stability, combined with high stain resistance, makes N-BK7 an ideal material for optical applications that require long-term performance and reliability. The resistance classes to climate, stains, acids, alkalis and phosphates emphasise the suitability of N-BK7 for use in various environmental conditions, ensuring the longevity and ease of maintenance of optical components made from it.

Manufacturing process and customer specification

Pleiger Laseroptik specialises in the production of optical components made of quartz and borosilicate glass, with a focus on adapting to customer-specific requirements. Our company offers a wide range of processing options (sawing, grinding, polishing) through to moulding to meet the specific needs of our customers. The ability to produce larger dimensions and special shapes on request extends the range of applications for these materials and enables the realisation of individual projects.

Borosilicate glass with a modern look

Borosilicate glass (N-BK7, S-BSL7) is indispensable in modern optics production. Its outstanding optical quality, combined with physical and chemical stability, makes it an ideal material for a wide range of optical applications. Pleiger Laseroptik utilises these materials to manufacture high-quality optical components that meet the demanding requirements of the industry. Over the years, we have provided many domestic and foreign partners with customised spherical lenses, optical domes, optical windows, optical mirrors, optical prisms and other optical components.

N-BK7 Glass

Do you need a mirror or a lens made of N-BK7?

Take a look at our optical mirrors . A wide range of materials is available.

Material properties

Density [g/cm3]:

2.51

Young‘s modulus [GPa]:

82.0

Knopp Hardness:

610

Poisson Ratio:

0.21

Heat capacity [J/K]:

858

Thermal conductivity [W/mK]:

1.11

Transmission range:

0.4 - 2.5

Um diesen Inhalt anzeigen zu können, müssen die Cookie-Einstellungen akzeptiert werden

Cookie settings

We are continuously improving our website and we use cookies for this purpose. For an optimal user experience, we recommend that you accept them. Otherwise, parts of the page will be deactivated in the display in accordance with data protection regulations.