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Pilkington Optitherm™ S1 Plus OW DGU

A single stock, low emissivity glass which has the same performance in both annealed and toughened format. It combines superior light transmittance with a highly neutral colour and is the ultimate in thermal insulation. Can also be supplied in laminated form.

Pilkington Optitherm™ S1 Plus can contribute significantly in the reduction of energy losses and hence heating costs due to its incredibly low Ug value. It also increases interior comfort by reducing downdraughts in window areas, ensuring even heat distribution throughout the room and should be specified for any situation where excessive heat loss is a concern.

Features/ Benefits:

  • Ultra low Ug-values of 1.0 and 1.1 W/m²K in a double glazed IGU, in accordance with BS EN 673.
  • Ug-values as low as 0.5 W/m²K in triple IGUs.
  • Suitable for both domestic and commercial applications including refurbishment and new build.
  • Highly neutral appearance in light transmittance (70%) and medium light reflectance (21%).
  • Available in a range of sizes and thicknesses for various applications.
  • Available in combination with Pilkington Optilam™ and Pilkington Optiphon™ for impact resistance, increased security or improved noise reduction.

General information




High performance, low-e coating, low U-values, energy efficient, neutral appearance in transmission and reflection, range of sizes and thicknesses


Glass, argon fill gas

Uniclass 2015

Pr_25_71_33_02 Annealed glass sheetsPrimary


H10/10 Patent glazing

H10/115 Patent glazing

H11/110 Curtain walling

H13/115 Structural glass assembly

L10/10 Wood windows

L10/15 Wood windows

L10/20 Steel windows

L10/210 Wood windows

L10/25 Aluminium windows

L10/250 Wood windows

L10/260 Wood windows

L10/30 PVC-U windows

L10/31 PVC-U windows

L10/310 Steel windows

L10/315 Steel windows

L10/33 Proprietary windows

L10/330 Aluminium windows

L10/335 Aluminium windows

L10/350 PVC-U windows

L10/360 PVC-U windows

L10/380 PVC-U windows

L10/390 Proprietary windows

L10/400 Composite windows

L10/410 Composite windows

L10/45 Rooflights

L10/460 Rooflights

L10/480 Roof windows

L10/50 Roof windows

L10/510 Glazed wood screens

L10/550 Glazed metal screens

L10/56 Glazed screen system

L10/560 Glazed screen system

L10/58 Secondary glazing system

L10/580 Secondary glazing system

L20/20 Wood flush doors

L20/230 Wood flush doors

L20/25 Wood panelled doors

L20/250 Wood panelled doors

L20/280 Doors

L20/410 Wood doorsets

L20/420 Wood doorsets

L20/430 Wood doorsets

L20/480 Doorsets

L20/55 Doorsets

L40/230 Bead-fixed single-glazing

L40/250 Bead-fixed single-glazing

L40/260 Bead-fixed single-glazing

L40/310 Bead-fixed single-glazing

L40/330 Bead-fixed single-glazing

L40/350 Bead-fixed single-glazing

L40/370 Bead-fixed insulating glass units

L40/371 Bead-fixed insulating glass units

L40/372 Bead-fixed insulating glass units

L40/380 Bead-fixed insulating glass units

L40/381 Bead-fixed insulating glass units

L40/410 Single-glazing into grooves

L40/430 Single-glazing into grooves

L40/450 Single-glazing into grooves

L40/470 Zipper gasket glazing

L40/490 Single-sided gasket glazing

L40/50 Bead-fixed single-glazing

L40/55 Bead-fixed insulating glass units

L40/57 Bead-fixed insulating glass units

L40/58 Bead-fixed insulating glass units

Specification data - Annealed glass sheets

Product Reference

Pilkington Optitherm™ S1 Plus Glass


4 mm

6 mm

8 mm

10 mm

12 mm

Special order.

Product Options

Maximum size:

Consult manufacturer.

Digital objects
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