WHY CHOOSE Radiation-resistant glass

  • Transparency: excellent light transmission
  • Variety: the material can be offered in different grades to best suit the requirements
  • Strength: unique laminated glass technology with excellent strength

VIDEO: Radiation-resistant glass



Presentation Radiation-resistant glass

Every year, Lemer Pax uses several hundred m³ of radiation resistant glass to carry out all its standard projects and products. 

Loaded with cerium oxide for very high radiation resistance or with lead oxide for dose rate reduction, in single sheets or thicker blocks measuring 10 centimetres and more, our range will help you solve all your viewing problems in ionising environments.

  • Stabilised glass – Ref: LPX-100

Stabilised glass is used on the hot side to protect the shielded glass from dust, scratches and impacts. It seals off hot cells (Alpha Glass). It is also used to protect lead glass blocks from high dose rates that can cause browning and dielectric charges (lead glass blocks are more sensitive than stabilised blocks).

  • Stabilised lead glass – Ref: LPX-200 // LPX-400

Intermediate blocks are used to reduce the dose rate and protect the lead glass block from browning. 

Note: LPX-400 is a grade with high resistance to browning but low optical transmission. This range is not one of our standard products (minimum order: 10 tonnes).

  • Lead glass – Ref: LPX-650 // LPX-700 // LPX-800

LPX-650 and LPX-700 laminated lead glass is typically used to protect against gamma and X-ray radiation. This glass is also used for our standard production of SLLGB (unbreakable) laminated lead glass blocks. 

LPX-800 lead glass is used for lead glass blocks with high dose rate attenuation.

  • Extra clear protection glass – Ref: LPX-900

Used with our exclusive “SLLGB” (unbreakable) technology, LPX-900 Extra clear protection glass is optically connected to each optical face of the leaded glass block, offering the following advantages:

  • Enhanced impact resistance & safety: the lead glass block becomes a laminated lead glass block with high impact resistance (e.g. collision with remote manipulators) and offers enhanced safety for areas open to the public (unbreakable, shatterproof)
  • Optimum light transmission (better air/transparent glass dioptre and less fragile than an anti-reflective coating)
  • Lasting light transmission: no surface oxidation of the lead glass during the entire service life of the windows
  • Enhanced scratch protection (lead glass is very sensitive to scratches)
  • Common cleaning products for ordinary glass can be used without damaging the lead glass (lead glass is very sensitive to acid and alkaline substances)
  • Anti-reflective laminated glass – Ref: LPX-910

When the accumulated dose is less than 1000 Gy, this cost-effective version presents excellent mechanical and optical qualities for sealing hot cells (Alpha Glass).

  • Normal glass – Ref: LPX-920

Normal glass blocks offer high transparency and density providing biological protection equivalent to that of standard concrete.

  • Boron glass – Ref: LPX-BORO

Used for its very high chemical resistance, boron glass also has good thermal shock resistance (can withstand temperatures up to 450°C).

Applications Radiation-resistant glass

Thanks to their high ionising ray absorption capacity and high light transmission, Lemer Pax radiation-resistant glass has applications in industry, medicine and research, to make viewing windows – also known as radiation-resistant windows – and screens.



Lemer Pax creates glass blocks through optical assembly of lead glass sheets. The block is a laminate with unmatched strength, especially when it comes to impact resistance. 

This technology allows the company to produce very thick blocks, to simplify the design of radiation protection windows.

With this technology, each optical face of the lead glass is protected by extra clear protection glass. It provides four major advantages in terms of light transmission:

  • No need for additional protective glass (cold and hot sides) that causes transmission loss or condensation problems.
  • The lead glass is protected from chemical attack during cleaning procedures, so common glass cleaning products can be used.
  • Protection against surface oxidation, which in the long term causes significant losses in light transmission.
  • Less reflective, reduced mirror effect frequently encountered with high density glass. Thanks to the protective glass, this effect is reduced two-fold, so no anti-reflective treatment is needed (which is very fragile).

After many years of research and development, Lemer Pax is today a leader in this type of manufacturing.

Thanks to our exclusive SLLGB laminated lead glass block technology, Lemer Pax creates optical assemblies that enhance and preserve the optical performance of your glass blocks, making them stronger and easier to care for. 

This technology makes working with glove boxes very safe.


  • Size: 2,400 x 1,200 mm maximum
  • Thickness: no thickness limit (570 mm already produced)
  • Dimensional tolerance:
  • Length: +2/-3 mm
  • Width: +2/-3 mm
  • Thickness (mm) ≤ 80: +3/0 mm
  • Thickness (mm) > 80: +5/0 mm
  • Chamfer at any edge: 2x2 mm


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