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We’re all familiar with the age old, problem of how to consistently incorporate 21st Century glass technology into aesthetically appropriate double glazed units for traditional and historic or listed properties.

It’s an issue our industry has grappled with for decades and something highlighted by the GGF who draw attention to the lack of specific test evidence available to date for IGU’s constructed with narrow cavities and reduced sightlines.

SafeGuard is the first company in the UK to achieve EN 1279 Parts 2 and 3 across a range of heritage IGUs as our CLARITY Classic range of slim units sailed through the moisture penetration index, and gas loss rates at BSI laboratories.

With an 8.5mm sightline and a five year guarantee, the CLARITY Classic range from Safeguard is the perfect option for those seeking a low sightline, alongside units that are made to the highest quality. Available in spacer sizes of 4mm, 6mm and 8mm in either dark brown or silver with white also available in 6mm and 8mm versions.

CLARITY Classic slim units are available incorporating a range of period glasses to closely replicate the aesthetics of the original glass.

Manufactured with the highest performing soft coat glasses on the market with either Argon or Krypton Gas, CLARITY Classic slim units can achieve U-values as low as 1.8 W/m2K with a 4mm Cavity and 1.1 W/m2K with an 8mm Cavity.

The product comes with a five year guarantee, which is valid when glazed in accordance with strict glazing and maintenance guidelines and is limited to the supply only of replacement units. Refer to glazing guidelines.


Period Glass Options

SCHOTT RESTOVER®: 3mm glass which replicates glass from early 1900’s, produced using the Fourcault process.

SCHOTT GOETHEGLAS: Toughenable 4.5mm glass to replicate glass from 18th and 19th centuries. Produced using the Fourcault process.

P1 Restoration: 3mm traditional hand made Polish
cylinder glass. Often used in churches and cathedrals.

Monument Glass: Machine drawn restoration glass.

Maximum Manufacturing Parameters

4mm Cavity = 600mm x 600mm
6mm Cavity = 750mm x 1000mm
8mm Cavity = 750mm x 1200mm

Minimum sized toughened 150mm x 250mm. Stamp discretely hidden in the glazing rebate unless otherwise specified.


Through extensive research, our CLARITY Classic sealed units are designed to provide the ultimate in long-lasting performance by incorporating a dual seal unit with aluminium spacer & a high performance sealant developed in conjunction with the world’s leading igu sealant manufacturer Fenzi.


To download our brochure click here

  • SafeGuard Peterborough

    SafeGuard Peterborough

    Telephone: 01733 555040
    Facsimile: 01733 352894

    Manor Drive, Paston Parkway
    Peterborough, Cambs, PE4 7AP

  • SafeGuard Papyrus

    SafeGuard Papyrus Road

    Telephone: 01780 751442
    Facsimile: 01780 755752

    52 Papyrus Road, Werrington,
    Peterborough, Cambs, PE4 5BH