3M FX-ST 5 Window Film
Dark FX-ST shade for maximum privacy, low visible-light transmission and UV protection.
3M FX-ST 5 is the darkest shade in the 3M FX-ST window film family. Its central role is simple: very low visible-light transmission creates a dark appearance and high daytime privacy while the film also provides the UV and solar-control characteristics of the FX-ST series.
Because darker film also reduces the light available for outward vision, FX-ST 5 should be chosen for the correct glass position and current vehicle requirements, not simply because it is the darkest option. If you want a lighter balance, compare FX-ST 20, FX-ST 35 and FX-ST 50.
3M FX-ST Window Film 5 Specifications at a Glance
3M reference data on Auto 75 glass: FX-ST 5 is listed at 4% VLT, 99% UV blocking, 61% TSER, 95% glare reduction, 8% IRR and 54% IRER.
3M reference data on 6 mm clear glass: FX-ST 5 is listed at 4% VLT, 99% UV blocking, 46% TSER, 95% glare reduction, 8% IRR and 24% IRER.
What this means: FX-ST 5 is the darkest shade in this Car Cool FX-ST group. Its very low VLT supports high daytime privacy and strong glare reduction, but it also reduces outward visible light more than FX-ST 20, 35 or 50. The two TSER figures are not contradictory because they were measured on different reference glass systems.
Use these figures as product-comparison data, then confirm the actual shade and glass position before installation. Compare the FX-ST parent range or move to FX-ST 20 if you want more visible light.
3M FX-ST 5 Window Film Example
Frequently Asked Questions About FX-ST 5
What is FX-ST 5 mainly for?
FX-ST 5 is the darkest FX-ST shade in this Car Cool group. It is primarily selected for a very dark appearance, high daytime privacy and strong glare reduction.
What does 3M publish for FX-ST 5?
On Auto 75 reference glass, 3M lists 4% VLT, 99% UV blocking, 61% TSER and 95% glare reduction. On 6 mm clear reference glass, it lists 4% VLT, 99% UV blocking, 46% TSER and 95% glare reduction. The different TSER values reflect different reference glass systems.
Does a darker shade automatically mean better heat rejection?
No. Darkness is described by VLT. Solar-energy performance is compared with metrics such as TSER, so the complete film-and-glass specification matters.
How does FX-ST 5 compare with FX-ST 20?
FX-ST 5 transmits less visible light, so it gives a darker appearance and more privacy. FX-ST 20 allows more visible light and is a better comparison if outward visibility is a higher priority.
Will FX-ST 5 interfere with GPS or mobile reception?
FX-ST is non-metallized. 3M states that the series is designed not to interfere with cell phones, GPS systems or satellite radio, although reception can still be affected by unrelated vehicle, device and network factors.
Is FX-ST 5 suitable for every vehicle window?
No. The correct choice depends on the existing glass, glass position, vehicle and current local requirements. Confirm the final configuration before installation.