3M SH14 (S140)safety window film

Safety film from 3M

The thickest clear safety film in the 3M Scotchshield range at 350μm. Three bonded layers deliver the strongest forced-entry and blast-mitigation barrier while keeping glass crystal clear.

SH14 is the heavyweight of 3M's clear safety films: 350 microns of transparent polyester in three bonded plies, with a scratch-resistant surface and a pressure-sensitive acrylic adhesive. 3M has it tested and classified to EN 356 for burglary resistance, EN 13501 for behaviour in fire, and GSA international safety standards, which are the certifications specifiers cite on government and high-security work.

Despite the thickness it stays honest glass: 85% of visible light passes on 6 mm clear glass, with 99% of UV blocked. Tear resistance is where it earns its place, 525 to 585 newton-millimetres by direction under EN 34-1, with tensile strength up to 170 MPa. It goes on wet or by semi-automatic dry lamination, on flat to simply curved glass, and needs no edge sealing.

One number is worth planning around: on a film this thick, final adhesion takes about 140 days at 18°C. The pane is protected from day one and the bond keeps strengthening for months, so judge the finished look well after fitting, not in the first week. In service it tolerates minus 40 to plus 70°C, and cleaning is any non-abrasive glass cleaner between pH 6 and 8.

Which glass it suits

SH14 is for interior application on flat or simply curved glass, applied wet or by dry lamination. Its EN 356 burglary-resistance classification is the certificate to cite in a security specification. Like every window film it is not bulletproof; its job is to hold broken glass in place and slow an entry down.

Performance at a glance

Specifications

Figures are nominal and provided for comparison. Your specialist confirms the final specification and suitability for your glass on a site survey.