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Radiation Shielding Glass RD 30®

Monolithic X-Ray Protection Glass

Special Properties

  • Monolithic glass with ≥ 0,5 mm Pb lead equivalent
  • Protection against X-rays and gamma radiation
  • Non-flammable
  • More scratch resistant than acrylic
  • High optical transmittance and clarity
  • Large glass sizes available
  • Holes and recesses with custom dimensions available
  • Can be ground and polished to custom thickness

Typical Applications

  • Sight glass for X-ray and gamma radiation protection
  • Radiation shielding glass for mammography equipment
  • Medical X-ray equipment and -rooms
  • Protective glass for radiation applications
  • Dental radiology applications
  • Viewports in radiology room doors
  • Industrial materials testing
  • Nuclear applications in high energy physics
  • Glove box shielding glass
  • Radiation barriers
  • Safety windows in medical areas

Related Glass Types and Information


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Radiation Shielding Glass

Protection from harmful x-ray and gamma radiation for safety in medical and scientific applications

RD 30® high performance radiation shielding glass is a lead-containing flat glass product that protects against gamma and X-rays. Such radiation is used in medical technology for diagnostic purposes, in radiation therapy, or in industrial materials testing equipment. Because these types of radiation have a high potential to damage health, accidental radiation exposure must be prevented at all costs. For this reason, transparent openings in medical equipment or sight glasses in viewing windows of doors to radiation areas must be protected with radiation shielding glass.

RD 30® glass from SCHOTT is the only radiation shielding glass product manufactured in Germany. It is an ideal and proven, high quality solution for transparent radiation shielding applications. RD 30® is a monolithic glass that contains lead oxide and provides a lead equivalent of ≥ 0,5 mm Pb at 56 kV (see table). The Pb value is a measure of how protective the radiation shielding glass is. It is expressed in mm Pb, which is equivalent to the shielding capacity of pure lead.

SCHOTT developed RD 30® glass specifically for safety in medical areas with low levels of X-ray radiation, such as mammography workstations. Even at tube voltages of up to 150 kV, RD 30® offers a lead equivalent Pb of ≥ 0,5 mm. It can therefore also be used in industrial test equipment and is an important safety element in various scientific nuclear applications.

To ensure the continued performance and safety of leaded radiation shielding glass, read and follow the installation, cleaning, and maintenance instructions. If you are looking for a product with higher lead equivalents, or for thicker radiation shielding glass materials, please refer to our RD 50® datasheet.

To request a quote for Original RD 30® radiation shielding glass windows or sight glasses, please click the button below:


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RD30® Monolithic Radiation Shielding Glass
Transmission spectrum in the UV-NIR range

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Standard Thicknesses

Please click on the glass thickness to request a quote.

Thickness (mm)


6,00 ±0,25
Smaller custom thicknesses are available upon request.

Lead equivalent for X-rays

RD 30® glass 6 mm thick

Tube Voltage
Lead equivalent
(mm Pb)
< 50 ≥ 0,5
50 ≥ 0,5
56 ≥ 0,5
76 ≥ 0,5
80 ≥ 0,5
100 ≥ 0,5
110 ≥ 0,5
150 ≥ 0,5

Refractive Index

  • ne = 1,579

Mechanical Characteristics

  • Density: ≥ 3,13 g/cm3
  • Young's modulus E: 65 kN/mm2
  • Poisson number µ: 0,229
  • Torsion modulus G: 26 kN/mm2
  • Knoop hardness HK 0,1/20: 460

Thermal Characteristics

  • Mean linear coefficient of thermal expansion:
    10,5 × 10-6/K (20 °C ; 300 °C) (static measurement)
  • Transformation Temperature Tg: 452 °C
  • Viscosities and corresponding temperatures:
    • Strain point (1014,5 dPa): 424 °C
    • Annealing point (1013 dPa): 452 °C
    • Softening point (107,6 dPa): 620 °C
    • Forming temperature (106 dPa): 716 °C
    • Forming temperature (105 dPa): 798 °C
    • Forming temperature (104 dPa): 909 °C

Chemical Properties

  • Hydrolytic resistance according to DIN ISO 719:
    • Hydrolytic Class HGB 3
    • Equivalent of alkali (Na2O) per g of glass grains: 138 μg/g
  • Acid-resistant according to DIN 12 116:
    • Acid Class S4
    • Half surface weight loss after 6 h:
      67 mg/dm2
  • Alkali resistant according to DIN ISO 695:
    • Alkali Class A2
    • Surface weight loss after 3 h:
      139 mg/dm2

If you need thicker radiation shielding glass materials in thicknesses up to 20 mm or a higher Pb for increased radiation shielding capacity and safety as required for nuclear applications, please visit our datasheet for RD 50® radiation shielding glass datasheet.

Please follow the installation, cleaning, and maintenance instructions for radiation shielding glass products.


All given details and specifications are mean reference values and are not guaranteed. Also, please consider the "Notes on Specifications".

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Last update: April 20, 2024