Post by Axxor Group

PHC Myth #3: Paper honeycomb can't be used in fire rated doors. At first glance, this one seems obvious. Paper. Fire. Not a great combination. The reality: some of the most widely used fire rated doors in North America are paper honeycomb doors, with no special fire treatment on the core. Here's why it works. In a fire rated door, the skins carry the fire resistance. They are the barrier. The core's job is different. Most fire doors do not fail because the facing burns through, but because the door warps. Heat on one side creates uneven expansion, the door bends, and gaps open at the edges. That's where fire and smoke get through. Paper honeycomb prevents exactly that. Its structure distributes stress evenly across the panel, keeping the door flat even when one side is exposed to intense heat. Also paper is a very good natural insulator so the heat is not transferred to the other side. Steel doors with 30 or 60 minute fire ratings across the US and Canada rely on this principle every day. Myth busted. Interested in how PHC performs under thermal stress? We're glad to share more.

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