3M Safety S140 (S14) Security Window Film

A clear three-ply polyester safety and security film with 14 mil nominal thickness. Selection depends on the existing glass, frame and objective; the film alone is not a ballistic or universal forced-entry solution.

Published film facts

Manufacturer Safety S140 technical data describes a nominal 14 mil, three-ply polyester film and 85% visible light transmission on 1/4-inch clear glass. Published values are for reference glazing, not a guarantee for every installed opening.

3M requires Impact Protection Attachment for all break-and-entry applications. Separately, IPA is required for spontaneous breakage applications on single-pane tempered glass. Confirm the exact application against current manufacturer instructions.

Frequently asked questions

Is S14 the same as Safety S140?

S14 is a commonly used shorthand; the manufacturer documentation identifies the product as 3M Safety S140 (SH14CLARL). Confirm the exact specified product in the submittal.

Does S140 need an attachment?

3M requires Impact Protection Attachment for all break-and-entry applications. Separately, IPA is required for spontaneous breakage applications on single-pane tempered glass. Match current instructions to the actual opening.

Is 14 mil a security rating?

No. Nominal film thickness is a material dimension. Performance belongs to a specific tested assembly of glass, film and attachment; it is not a promise of delay time or bullet resistance.

Request a free estimate or call (302) 947-4624. Shore Tint & More (Delaware Window Film) — 3M Authorized Dealer, IWFA accredited, serving Delaware and the Maryland Eastern Shore since 1989.