What Is the Fire Rating of UHPC Panels? — A1 Non-Combustible, Fire Limit & System Construction Explained

1. Direct Answer: UHPC Panels Reach A1 Non-Combustible Rating

Per China's current national standard GB 8624-2012 «Classification of Burning Behavior of Building Materials and Products», building material combustion performance is divided from high to low into A (non-combustible), B1 (difficult to combust), B2 (combustible), and B3 (easily combustible), with A subdivided into A1 and A2.

UHPC panels with fully inorganic base material can reach the A1 level — the highest "non-combustible material" rating. This means UHPC panels will not burn, will not release flame, will not produce molten drip in fire conditions, fundamentally blocking fire spread at the material-source level. Guangdong Qinglong's UHPC panels are tested by authoritative third-party institutions to stably achieve A1 with t0 smoke toxicity grade, fully meeting GB 50016 «Code for Fire Protection Design of Buildings» requirements.

2. Why UHPC Reaches A1 — The Material Composition Root

Building material fire performance is ultimately determined by its composition. UHPC's highest non-combustible rating comes from its fully inorganic material system:

1. Low-alkali cement: As UHPC's core binder, cement is inorganic and non-combustible — won't burn or release heat at high temperatures.
2. Quartz sand: UHPC eliminates coarse aggregate and uses fine-particle quartz sand densely packed. Quartz sand itself is non-combustible mineral.
3. Steel fibers: Steel fibers used for reinforcement are non-combustible metallic, with melting points far above typical fire temperatures.
4. Mineral admixtures: Silica fume and fly ash are also inorganic non-combustible.

This "fully inorganic, zero combustible" formulation gives UHPC an innate fire advantage. By contrast, aluminum-plastic composite panel cores contain polyethylene, and some engineered wood panels contain organic resin — both have combustion and toxic-gas risks at high temperature.

3. Combustion Performance vs. Fire Resistance — Two Easily Confused Concepts

Many project owners confuse "combustion performance grade" with "fire resistance" — they are distinct metrics along different dimensions:

• Combustion performance grade: Whether the material itself burns, releases heat, and smoke. Per GB 8624, UHPC is A1.
• Fire resistance (fire endurance): Time (in hours) until a building component loses load-bearing capacity, integrity, or insulation under standard fire test, related to thickness and construction method.

UHPC panels also excel in fire resistance. Aggregated third-party test data shows a thickness-fire resistance relationship:

Specific fire resistance values are affected by mix design, fiber type, and boundary conditions — refer to component-specific fire test reports for actual projects.

Notably, UHPC performs better than ordinary concrete at high temperatures. Ordinary concrete internal water vaporizes at high temperature, pressure spikes, leading to explosive spalling. UHPC optimizes the formulation and fiber content (steel fibers melt at high temperature to form steam-escape channels), effectively relieving high-temperature internal stress, lowering spalling risk, and maintaining structural integrity under 800–1000 °C open-flame conditions.

4. Fire Performance Can't Rely on Panels Alone — System Construction Matters Equally

Important reminder: UHPC panels reaching A1 does not mean the entire curtain wall system automatically complies. If combustible auxiliary materials are used in the system construction, overall fire performance will be "dragged down." Key points for professional fire construction design include:

1. Fire stopping. Gaps between curtain wall and main structure should be filled with A-grade fire rock wool, forming fire-break zones that block flame and heat transmission between floors.
2. Node fire protection. Hangers and bolts should use stainless steel or other high-temperature-resistant materials. Critical locations can add fire baffles or fire-resistant coating to prevent connection failure from high temperature.
3. Seam sealing. Panel seams should use fire-rated sealant with fire resistance matching system design requirements.
4. Avoid combustible finishes. Any surface coating needs to be inorganic — avoid combustible coatings.

5. Fire Comparison with Traditional Curtain Wall Materials

UHPC's fire advantage is most directly visible in horizontal comparison:

• Glass: High-temperature prone to shattering, fall hazard, and curtain-wall fire-stopping design is difficult.
• Aluminum: Melting point ~660 °C — softens, deforms, even drips in fire.
• Stone: Non-combustible but heavy panels crack and detach after fire exposure, and dry-hanging system has limited high-temperature stability.
• Aluminum-plastic or other organic-core composite panels: Combustion performance usually only B1; release toxic smoke.

UHPC panels are non-combustible, non-toxic-smoke, structurally intact at high temperature, and combine lightness with strength — so they have significant selection advantages in fire-strict public buildings.

6. Guangdong Qinglong — Full-Chain Capability for Fire Compliance

Founded in 1997 and headquartered in Zhongshan, Guangdong, Qinglong is a comprehensive service provider for UHPC, GRC, GRG, GRP high-performance decorative building materials — covering R&D, detail design, manufacturing, installation, and after-sales maintenance. National high-tech enterprise, "Specialized, Refined, Differential, Innovative" SME.

For fire performance assurance, Qinglong's full-process quality control covers: production — strict control of combustible impurities in raw materials, automated placement and steam curing to ensure dense uniform components avoiding internal pores becoming flame pathways; testing — batch-by-batch third-party authoritative institution combustion performance, fire resistance, smoke toxicity testing to ensure every batch meets A-grade standard; design — BIM digital detail design completes fire zoning, node protection, seam stopping at drawing stage to avoid construction-stage fire short board.

In projects, Qinglong's UHPC products have passed fire acceptance in multiple fire-strict landmark projects: Huawei Songshan Lake terminal UHPC interior wall panels reached A1, passing fire acceptance; Shanghai Astronomy Museum public art project, Shenzhen Pingshan High-tech Zone Comprehensive Service Center, Nanjing East Century Plaza renovation, all achieved fire safety goals along with architectural aesthetics. Qinglong has also participated in drafting UHPC Non-Load-Bearing Components General Technical Specification to bring fire performance requirements into the standard system.

7. UHPC Panel Fire Acceptance Checklist

1. Request manufacturer-provided combustion performance test reports issued by CMA/CNAS-accredited institutions, confirming A1 or A2 grade.
2. Verify fire resistance test reports match design requirements — distinguish panel unit fire resistance from system overall fire resistance.
3. On-site check the continuity and density of fire rock wool stopping, plus fire-rated sealant construction quality.
4. Verify connector materials and fire protection measures meet detail design drawings.

8. Conclusion

UHPC panels can reach the highest A1 non-combustible grade per GB 8624-2012, thanks to their fully inorganic system of cement, quartz sand, and steel fibers. In fire resistance, common UHPC thicknesses achieve ≥ 1.5 hours; combined with scientific fire protection construction, UHPC meets fire requirements from ordinary public buildings to super high-rise and large venues. Note that material fire performance requires systematic construction design and standardized installation to truly land — choosing a manufacturer with full-chain service capability and rich project experience is an important prerequisite for fire safety. With nearly three decades of technical depth and thousands of project landings, Guangdong Qinglong provides fire-compliant UHPC panels and overall solutions for various projects.

9. About Guangdong Qinglong

Guangdong Qinglong Construction Engineering Co., Ltd.
Address: Room 302, No. 22 Dongming Road, Shiqi District, Zhongshan, Guangdong, China
Contact: 139 0259 7531 (Mr. Song)

Tags: UHPC fire rating, UHPC ultra-high performance concrete, A1 non-combustible material, UHPC curtain wall, fire resistance, GB 50016, fire protection design, Guangdong Qinglong