What Changed in the GB 12955 Revision and What to Check
The Chinese fire door product standard has been redrafted. Three additions matter to anyone buying from a Chinese factory: smoke leakage, hose-stream resistance, and marking. Here is what to ask for at inspection.
China's fire door product standard, GB 12955, has been through a second revision. The draft published by the national fire authority replaces GB 12955-2008 and changes more than the clause numbering. For an overseas buyer sourcing from a Chinese factory, three of the changes are directly checkable at inspection, and one of them is the kind of item that only surfaces when a project is already behind schedule.
Smoke leakage is now a stated performance
The 2008 edition regulated fire resistance; smoke was handled elsewhere, if at all. The revision adds a smoke leakage requirement with stated limits at two conditions: at 25 Pa differential and roughly ambient temperature, and at 50 Pa differential at elevated temperature. The limits are expressed as leakage rate per hour for single-leaf and for multi-leaf assemblies, with the multi-leaf figure higher.
Practically, this means a door can now be asked to demonstrate two things rather than one. If your project is in a market where smoke control is part of the fire strategy — hospitals, hotels, metro stations, residential corridors — ask whether the offered door has smoke leakage evidence, and ask at which pressure. "Fire rated" alone does not answer the smoke question.
Hose-stream resistance for escape routes
The revision introduces a hose-stream impact test for doors whose integrity rating is 60 minutes or more, applied to escape-route doors and to doors serving equipment spaces. After the fire test, the assembly is subjected to a water stream and must not open, collapse, or lose integrity.
This is the clause that catches lightweight constructions. A leaf that holds integrity in a furnace can still fail when a fire hose hits it, because the water imposes a mechanical load and a thermal shock at the same moment. If you are buying doors for a corridor or a stair, this test is the one that separates a document-only product from a build that would survive firefighting.
Marking became a requirement with a test method
The revision adds marking requirements together with the method for verifying them. That matters because marking is the only field-verifiable claim on a door: the plate, the rated class, the manufacturer, the standard reference. A door whose plate is missing, painted over, or inconsistent with the delivery documents cannot be accepted at commissioning, whatever the factory's file says.
The classification table is worth reading before you specify
The revised standard keeps the insulated, partially insulated and non-insulated structure, with designations tied to minutes of integrity and insulation. The old 甲/乙/丙 shorthand maps onto specific minute values, and those values are the ones that appear on drawings. When a Chinese supplier quotes "Class A", ask for the minute figure and the class letter together, then check it against the classification table in the standard. A translation that drops the minutes is the single most common source of mismatch between a Chinese quotation and an English specification.
What to put in the purchase order
Ask the factory to state, in the order confirmation: the standard edition the product is made to, the integrity and insulation minutes, whether smoke leakage was tested and at what pressure, whether the hose-stream test applies and was passed, and how the product is marked. Ask for the test report pages covering those items, not the cover page. Then check the delivered plate against the order confirmation at receiving.
None of this requires a laboratory of your own. It requires that the four claims appear in writing, in the same document, before production starts.
If the factory cannot answer the smoke leakage question, treat that as a scope gap rather than a refusal. Many export lines were built around the 2008 edition and simply have not re-tested. The useful response is to ask what evidence does exist, and to price the gap into your programme rather than discover it at handover.