Glass Tubing with High UV Transmission

SCHOTT’s reputation for the highest quality materials is demonstrated by its high UV-C transmitting glasses. These glasses offer outstanding physical properties, including high UV transmittance and thermal expansion that matches their sealing partners, making them ideal for UV light sensors and lighting.

Unique properties for specialist applications

Exceptional UV transmittance

Of all SCHOTT products, 8337B and RayVolution® D 99 offer one of the highest transmissions in the deep-UV range. For UV light transmittance, their credentials are hard to beat.

Matched thermal expansion

SCHOTT 8337B forms a direct bond with tungsten and the iron-nickel-cobalt alloy Kovar, as both have similarly low coefficients of thermal expansion. As a ‘soft’ glass, SCHOTT RayVolution® D 99 is suitable for sealing into low-pressure discharge lamps.

Low transformation temperature

SCHOTT 8337B and RayVolution® D 99 glass tubing offer comparably low transformation temperatures for further processing.

Impressive impermeability

Tungsten- or Kovar-sealed SCHOTT 8337B envelopes and SCHOTT RayVolution® D 99 based discharge lamps provide devices with a long lifetime thanks to the unique properties of the glasses and their high geometrical accuracy.

Physical Data

SCHOTT 8337B  borosilicate glass is used for UV-transmitting photomultipliers and UV detectors. It can be sealed to Kovar alloy and tungsten, and is highly UV-transmitting.


SCHOTT 8347 is a borosilicate glass that offers high chemical and thermal resistance, with high transmittance in the UV-C spectrum. This combination makes it ideal for germicidal lamps that are used in water. The glass can be also used for fibre optics light guides and electrotechnology, as well as in applications requiring high IR transmittance.


SCHOTT RayVolution® D 99 is a highly UV-transmitting soft glass that can be used as envelope for germicidal lamps (low-pressure mercury vapour discharge lamps).


Table showing the physical data of 8337B, 8347, 8405

Transmission graph of UV-transparent tubular glass types

The characteristic transmission values [%] at corresponding wave lengths [nm] for SCHOTT 8337B,  8347 and RayVolution® D 99 at a wall thickness of 1.0 mm are: 


Chemical Resistance

Chemical Resistance 8337B
RayVolution® D 99
Hydrolytic resistance (ISO 719) Class HGB 3 Class HGB 1 Class HGB 5
Class Acid resistance (DIN 12116) Class S 4 Class S 1 Class S 3
Class Alkali resistance (ISO 695)  Class A 3  Class A 2  Class A 2

The heavy metal content for the elements lead, cadmium, mercury and hexavalent chromium is below 100 ppm

Want to know more? Let's talk

Whether you need more information, samples, a quote, or advice for a project, we would be delighted to talk to you.

Contact us
Man in glasses in business office on phone while working on laptop