RD 30® Radiation Shielding Glass
X-Ray Protection
Special Properties
- Monolithic lead glass with ≥ 0.5 mm Pb lead equivalent
- Protects against X-rays and gamma radiation
- Non-flammable
- More scratch-resistant than acrylic
- High optical transmittance and clarity
- Large sizes available
- Sight glass quality
- Holes and recesses with special dimensions are possible
- Can be ground and polished to custom thicknesses
Typical Applications
- Sight glasses for X-ray and gamma protection
- X-ray protection in mammography devices
- Medical X-ray rooms
- Protective glass for industrial radiation testing devices
- Dental radiology
- Viewports in radiology room doors
- Material testing equipment
- High-energy physics
- Glove boxes
- Radiation barriers
- Safety windows in medical areas
Related materials and information
- RD 50® lead glass from SCHOTT with a higher Pb range
- Installation, cleaning, and maintenance instructions for radiation shielding lead glass (Safety Instructions)
RD 30® Glass protects from x-ray and gamma radiation
RD 30® is a lead-containing flat glass product that protects against gamma and X-ray radiation. Such radiation is used for diagnostic purposes in medical technology, in radiation therapy, or in industrial material test equipment. Because these types of radiation have a high potential to damage health, accidental exposure must be prevented at all costs. For this reason, transparent openings in medical devices or viewing ports in doors to radiological areas are protected by radiation shielding glass.
RD 30® from SCHOTT is the only radiation shielding glass product manufactured in Germany. It is an ideal and proven, high-quality protective solution for many X-ray applications. RD 30® is a monolithic glass that contains lead oxide and provides ≥ 0.5 mm Pb at 56 kV (see table). The Pb value is a measure of how protective a radiation shielding glass is. It is expressed in mm Pb, which is equal to the protection capacity of pure lead.
SCHOTT developed RD 30® lead glass specifically for safety in medical areas with lower levels of X-ray radiation, such as mammography workstations. At tube voltages of up to 150 kV, RD 30® glass offers a Pb of ≥ 0.5 mm. It is also often used in industrial X-ray test devices and is an important safety element in various scientific nuclear applications.
If you are searching for glass materials with higher lead equivalents or for more protective shielding capacity, please refer to our RD 50® datasheet.
To request a quote for original RD 30® sight glass windows, please click the button below:
Specifications
RD30® Transmission spectrum
in the UV-NIR range
Zoom in on the graph to see details
Standard Thicknesses
| Thickness (mm) | Tolerance |
|---|---|
| 6.00 | ±0.25 |
| Smaller custom thicknesses are available upon request. | |
Lead Equivalents for X-rays
| RD 30® glass 6 mm thick | ||
|---|---|---|
| Tube Voltage (kV) |
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 lead glass with thicknesses of up to 20 mm and a higher Pb value for increased shielding capacity and safety as required for nuclear applications, please visit our RD 50® datasheet.
Note: To ensure the continued performance and safety of leaded radiation shielding glass materials, read and follow the installation, cleaning, and maintenance instructions.
All data and specifications given are average guide values and are not guaranteed. Moreover, please consider the “Notes on Specifications”.
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Last update: July 08, 2025