Architectural · Solar control

Low solar absorbance window film

Reject the heat, keep the daylight, keep the glass neutral — without loading the glazing thermally. Two films answer all four, and the absorbance figure is published for every film we make.

Pale curved façade rising into a clear morning sky

Why absorbance decides the glass risk

Film does not break glass — thermal stress does. An absorbing film turns sunlight into heat inside the glazing: the centre of the pane gets hot, the frame keeps the edges cool, and the edges go into tension. Annealed glass, tinted glass, partial shading and large panes all compound it, and on a retrofit you can change none of them. You can change the film.

Every film, ranked by absorbance

Lower is cooler for the glass. Our two picks are marked.

SILVER 00 2.1% VLT · Silver

14.6%

SILVER 20 22.1% VLT · Silver

26.9%

Sputter Supreme 50 Pick 42.9% VLT · Neutral

27.5%

SILVER 30 38.4% VLT · Silver

29.0%

SILVER 05 5.7% VLT · Silver

29.9%

SILVER 50 Pick 53.1% VLT · Silver

31.3%

Sputter Supreme 35 36.3% VLT · Neutral

31.8%

Above 32% — higher thermal load

Broco 50 50.1% VLT · Bronze

35.4%

Broco 35 35.0% VLT · Bronze

37.3%

Broco 20 16.5% VLT · Bronze

37.4%

Sputter Supreme 20 19.3% VLT · Neutral

40.2%

Sputter Max 50 44.6% VLT · Grey

48.4%

Sputter Max 20 20.4% VLT · Grey

49.2%

Sputter Max 35 39.3% VLT · Grey

52.2%

The two we specify

Sputter Supreme 50

Neutral

The lowest absorbance of any vision-glass film in the range, and it gives up nothing to get there.

Solar absorbance: 27.5%
Visible light (VLT): 42.9%
IR rejection: 95.5%
TSER: 61.4%

SILVER 50

Max daylight

The brightest film we make and still inside the low band. Trade-off is a silver reflective exterior.

Solar absorbance: 31.3%
Visible light (VLT): 53.1%
IR rejection: 49.0%
TSER: 36.8%

Approved on the glass you have

Absorbance explains the physics; the compatibility chart governs the warranty.

Glass build-up	Sputter Supreme 50	SILVER 50
Single pane — clear annealed	Approved	Approved
Single pane — H/S tempered	Approved	Approved
Single pane — tinted annealed	Approved	Approved
Dual pane — clear annealed	Approved	Approved
Dual pane — outboard tinted	Approved	Approved
Dual pane — inboard tinted	Approved	Approved
Low-E — standard, Plus/E2, Plus Plus/E3	Approved	Approved
Triple pane	Not covered	Not covered
Laminated	Not covered	Not covered

Most of the range is narrower: Sputter Supreme 20 and 35 and Sputter Max 20 and 35 are not covered on Low-E, and SILVER 00–30 need pre-approval on tinted glass. Triple-pane and laminated are excluded for every sputter and silver film.

Full film-to-glass compatibility chart (PDF)

The chart is a screening guide, not a warranty. Glass breakage, thermal-stress failure and insulated-glass seal failure are excluded from the LUNOX film warranty; final suitability rests with the installer, glass manufacturer or a qualified glazing professional.

Send us the glazing

Glass make-up, elevation, shading and pane sizes. We return a written thermal-stress view and a recommended film, normally within two working days.

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