GB12955‑2024 New National Standard for Fire‑rated Doors｜Concise Professional Interpretation

Effective on May 1, 2026, replacing the old GB12955‑2008 ✅

Core Change: The written Grade‑A/B/C (old Chinese naming) is officially abolished.

Tender documents, drawings and test reports shall adopt the new code: A/B/C + fire resistance duration.

(Oral reference to old grades is still acceptable.)

✅ Type A｜Insulated Fire‑rated Doors (Integrity + Insulation both satisfied)

‑ A0.5 (30min) = Old Grade‑C

Only Type A corresponds to the traditional old A/B/C grades.

‑ A1.0 (60min) = Old Grade‑B (widely used for hotel guest room doors)

‑ A1.5 (90min) = Old Grade‑A (for machine rooms & fire‑compartment partitions)

Only Type A corresponds to the traditional old A/B/C grades.

✅ Type B｜Partially‑insulated Fire‑rated Doors

Only 0.5‑hour insulation, longer integrity duration.

For machine rooms & shaft enclosures only. Cannot replace evacuation guest‑room doors.

✅ Type C｜Non‑insulated Fire‑rated Doors

Only fire integrity guaranteed, no insulation performance.

For shaft / steel‑structure applications.

Strictly prohibited for guest‑room doors & entrance doors.

⚠️ Common Pitfall: Type‑B1.5 ≠ Old Grade‑A.

Type‑B only provides 30‑min insulation, cannot meet 90‑min insulation requirement of old Grade‑A.

📄 Tender specification template

Fire‑rated door, Model A1.0, comply with GB12955‑2024, insulated fire‑rated door, fire resistance integrity ≥60min, fire resistance insulation ≥60min.