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Airports, convention centres, metro stations and large retail projects all ask the same question before they approve a material: what fire rating does it carry. The answer is not one certificate but a set of regional standards, and they test different things. This is what the three most requested ratings actually measure.

DIN 4102 B1 (Germany)

The reference standard for flexible media across Europe. B1 means schwerentflammbar, or highly flame-retardant. Flex banner and window film pass through a vertical chimney test, and to hold the rating they have to self-extinguish as soon as the ignition source is removed, with no flaming droplets falling from the sample.

NF P 92-507 M1 (France)

M1 is one of the stricter regimes in Europe because it measures two things at once: whether the material burns, and how much toxic gas it gives off as it decomposes. It is required for backlit film and fabric light boxes installed in enclosed public transport environments, where smoke is the bigger hazard.

NFPA 701 (United States)

The standard for hanging banners, fabrics and flexible media in North America. Materials are classified by weight and density rather than by a single pass or fail, so a heavy banner and a light fabric are judged against different thresholds. The practical aim is that indoor hanging graphics do not spread flame or block an escape route.

What makes a rating hold up

Flame retardancy has to be built into the material, not sprayed onto it. Our factory compounds halogen-free antimony trioxide and phosphate-based retardants into the liquid PVC used for flex banner and into the core polymer of acrylic and PVC board. A topical treatment can pass a test on the day and fail a year later; a compounded one does not wash off, wear off or migrate.