Borosilicate/Borofloat Discs and Plates

BOROFLOAT® 33, high quality borosilicate glass for a wide range of applications

How to Order

1. Select a thickness from the table below. (Other thicknesses are available on request)

2. Discs: Indicate the diameter. Plates: Indicate the dimensions.

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Introduction

BOROFLOAT® 33 is a high quality borosilicate glass with outstanding properties for a wide-range of applications.

This unique special float glass is manufactured by SCHOTT JENA GLAS using the Microfloat process and the latest technology. This technology also results in a homogeneous material that has an excellent mirror-like surface, a high degree of flatness and an outstanding optical quality.

BOROFLOAT® 33 is a clear and transparent colourless glass. Its excellent transmission and its very weak fluorescence intensities over the entire light spectrum make BOROFLOAT® 33 ideal for a wide range of applications in optics, optoelectronics, photonics and analytical equipment.

Its low thermal expansion, its high thermal shock resistance and its ability to withstand temperatures up to 450°C for long periods make BOROFLOAT® 33 a good choice for applications which call for good temperature stability (e.g. internal panels in pyrolytic self-cleaning ovens and over plates for high-power floodlights).

BOROFLOAT® 33 is highly resistant to attack by water, strong acids, alkalis as well as organic substances. Therefore it is particularly suitable for applications in the chemical industry such as sight glasses for reaction vessels and fittings.

Another interesting field of application is in medical and analytical technology. Measurements are hardly influenced by the glass receptacle because the exposure to water and acids results only in the leaching out of small amounts of ions from the glass.

BOROFLOAT® 33 has a lower density than soda lime float glass. It makes it possible to construct lightweight laminated glass systems (e.g. bulletproof glass).

Its low thermal expansion, its high thermal shock resistance and its ability to withstand temperatures up to 450°C for long periods make BOROFLOAT® 33 a good choice for applications which call for good temperature stability (e.g. internal panels in pyrolytic self-cleaning ovens and over plates for high-power floodlights).

BOROFLOAT® 33 has proven itself in many traditional applications and, today, there is an increasing area of usage in new and technically sophisticated special glass applications such as biotechnology, microelectronics and photovoltaics.

Product Description

BOROFLOAT® 33 is a borosilicate glass type 3.3 as specified in the international standard ISO 3585 and EN 1748 T1. BOROFLOAT® 33 products meet most international standards, for example the German, British, American and French standards.

The structural characteristics and the material’s purity grade (low content of polyvalent ions) of BOROFLOAT® 33 results in an overall high transmission of ultraviolet, visible and infrared wavelengths.

Thanks to its low alkali content, BOROFLOAT® 33 works as a good electric insulator.

Due to its high boron content, BOROFLOAT® 33 can be used as a neutron absorber glass in nuclear energy applications.

BOROFLOAT® 33 is environmentally friendly and made of natural raw materials. The glass can be recycled several times and disposed of without difficulties.

Chemical Properties

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The phenomenon of tin traces on the surface is commonly known from the manufacture of soda-lime float glass.

It is caused by an evaporation effect in the float bath atmosphere. These values are considerably lower for BOROFLOAT® 33 than for soda-lime float glass on both the side in contact with the tin and on the other side which is exposed to the atmosphere.

The reciprocal effect with coating is thus markedly less. It is recommended that the top side (labeled by the manufacturer) is used for coatings.

 

 

 

 Fitting

The basic guidelines for the fitting and handling of glass and glass-ceramics also apply to BOROFLOAT® 33.

1. When sizing frames and panels, the different thermal expansions of BOROFLOAT® 33 and the various frame materials plus any possible manufacturing tolerances must be taken into account.

2. If it is necessary for design considerations to use compression fixing of the glass in the frame, this pressure must be applied uniformly all around the edge of the panel (no uneven pressure).

3. The glass must be fitted in non-distorting frames. If it is not possible to avoid a small amount of torsion, a suitable permanently elastic gasket must be used to prevent the torsion in the frame being transferred to the glass.

4. There must be no direct contact between glass and metal (or any other hard element of construction). Permanently elastic, heat-resistant materials (e.g. mineral fiber materials) are recommended as an intermediate layer between glass and metal.