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Radiation Shielding Glass RD 30®

Monolithic X-Ray Protection Glass

Special Properties

  • Monolithic glass with a lead equivalent of ≥ 0,5 mm Pb
  • Protection against X-ray and gamma radiation
  • Non-flammable
  • More scratch-resistant than acrylic
  • High optical transmission and clarity
  • Large glass dimensions are available
  • Holes and recesses with freely defined dimensions are possible
  • Can be ground and polished to a custom thickness

Typical Applications

  • Sight-glass window for protecting from X-ray and gamma radiation
  • Radiation shielding glass for mammography devices
  • Medical X-ray equipment and -rooms
  • Protection glass window for irradiation applications
  • Dental radiological applications
  • Viewports in radiological room doors
  • Industrial material testing
  • Nuclear applications in high-energy physics
  • Shielding glass for glove boxes
  • Radiation protection viewing window in medical areas

Related glass types and information


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Radiation shielding glass

Protection against harmful x-ray and gamma radiation in medical and scientific applications

RD 30® high-quality radiation shielding glass is a drawn lead-containing flat glass product that protects against gamma and X-ray radiation. Such radiation is used in medical technology for diagnostic purposes or in medical radiation therapy. Also, material testing uses X-rays. Because these types of radiation have a high potential to harm health, accidental radiation exposure must be prevented. Hence, transparent openings of medical devices, sight glasses, or viewing windows in doors to radiation areas must be protected with radiation shielding glass for safety reasons.

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 tasks. RD 30® is a monolithic X-ray-protecting glass that contains lead oxide and provides a lead equivalent of ≥ 0,5 mm Pb at 56 kV (see table). The lead equivalent is a measure of how protective the radiation-shielding glass is. It is indicated in mm Pb or as a percentage of the glass thickness equal to pure lead.

SCHOTT developed RD 30® glass explicitly for medical areas with lower X-ray radiation, like mammography workplaces. However, even with tube voltages of up to 150 kV, RD 30® has a lead equivalent of ≥ 0,5 mm Pb. Hence, it is often used for industrial testing equipment and scientific nuclear applications.

To ensure the durable and safe function of leaded radiation shielding glass, read and follow the installation, cleaning, and maintenance instructions. If you are looking for a radiation-shielding glass product with a higher lead equivalent, i.e., increased radiation shielding capabilities, or for thicker radiation-shielding glass materials, please look at the RD 50® information data sheet.

To get a quote for radiation shielding sight-glasses or windows made of original, high-quality RD 30® radiation protection glass, please use the button below:


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RD30® Monolithic Radiation Shielding Glass
Transmission spectrum

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Standard Thickness

Please click on glass thickness to request a quote.

Thickness (mm)


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

Lead-equivalent for X-ray radiation

RD 30® glass at 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 more substantial lead equivalent for increased radiation shielding as required for nuclear applications, please visit our datasheet for RD 50® radiation shielding glass.

Please observe 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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