Effective Date: August 1, 2026, replacing the former mandatory national standard GB 15763.1‑2009 Standard Attribute: This is a recommended national standard (GB/T). Mandatory safety requirements are governed by GB 46030‑2025 Safety Technical Requirements for Architectural Safety Glass, forming a dual‑layer system of “mandatory general requirements + recommended product specification”. Supporting industry standard: XF 97‑2025 Non‑load‑bearing Fire‑Resistant Glass Partition Walls (effective May 1, 2026, covering complete partition assemblies).
I. Major Changes in Standard Positioning
- The old GB 15763.1‑2009 was a mandatory product standard. The revised version is converted to recommended GB/T. However, fire‑safety performance in construction projects must comply with the mandatory baseline requirements of GB 46030‑2025.
- GB 46030‑2025 specifies mandatory test items for fire‑resistant glass: fire resistance, humidity resistance, cold resistance, radiation resistance, fragment status, etc. Products failing these requirements shall not be used in construction.
- CCC China Compulsory Certification rules have been updated. New certificates are issued against GB/T 15763.1‑2025. No new certificates will be granted under the old standard. Purchasers shall verify that manufacturers have completed certification migration.
II. Major Upgrades to Product Classification (vs. 2009 Edition)
1) Classification by Structure (Four Types)
表格
| Code | Name | Description |
|---|---|---|
| FFB | Laminated Composite Fire‑Resistant Glass | With intumescent fire‑resistant interlayer gel |
| DFB | Monolithic Fire‑Resistant Glass | Toughened borosilicate / soda‑lime‑silica glass |
| JFB | Sandwich Fire‑Resistant Glass | New category: composite fire‑resistant plus safety sandwich structure |
| ZFB | Insulated Fire‑Resistant Glass | New category: insulated double‑glazed fire‑resistant unit |
Further sub‑classification for DFB monolithic glass by base material:
- P: Borosilicate fire‑resistant glass
- NG: Soda‑lime‑silica fire‑resistant glass
2) Classification by Fire‑Resistance Performance (Three categories, new Category B for partial insulation)
- Class A (Insulating Type): Satisfies both integrity and thermal insulation; applied to fire doors and interior fire partitions.
- Class B (Partial‑insulating Type, newly added): Satisfies integrity plus limited heat flux ≤15 kW/m²; preferred for curtain walls and exterior windows.
- Class C (Non‑insulating Type): Satisfies fire integrity only; commonly used for external building curtain walls.
Five fire‑resistance duration grades remain: 0.5 h, 1.0 h, 1.5 h, 2.0 h, 3.0 h.
3) Classification by Fire Temperature‑Time Curve (Application scenarios, newly added)
‑ N: Internal‑fire curve up to 1100 °C (interior partitions, fire doors) ‑ W: External‑fire curve up to 660 °C (building external curtain walls)
Products qualified for N‑condition can cover W‑condition applications. W‑condition products shall NOT be used for interior fire scenarios. Internal‑fire and external‑fire rated glass are not interchangeable.
Example of Revised Product Marking
DFB‑10‑CP‑1.50‑N
DFB‑Monolithic‑10 mm thickness‑Class C non‑insulating‑P borosilicate‑1.50 h‑N internal fire condition.
III. Key Technical Specification Revisions
1. Strengthened Durability Requirements (absent in old edition)
Mandatory tests: humidity resistance, cold resistance, radiation resistance. Simulate high‑humidity, low‑temperature and UV‑aging conditions to prevent gel degradation, delamination and whitening.
After aging test, FFB composite fire‑resistant glass shall show no bubbles, delamination or abnormal light transmission.
2. Stress control for monolithic soda‑lime‑silica fire‑resistant glass
‑ Surface stress: 140‑180 MPa ‑ Stress uniformity: ratio between (max‑min value) and average value ≤10%, to reduce spontaneous breakage risk.
3. Clear edge‑processing requirements (critical for site practice)
‑ Soda‑lime‑silica fire‑resistant glass: Polished edges, corner radius R1‑R3 with polished finish. ‑ Borosilicate fire‑resistant glass: Finely ground edges.
Edge defects are a major cause of thermal breakage for monolithic fire‑resistant glass; no explicit requirements existed in the old standard.
4. New Appendix A: Rapid identification of base materials (for acceptance inspection)
Distinguish borosilicate (P) vs. soda‑lime‑silica (NG):
- Refractive index: Borosilicate ≈1.48; soda‑lime‑silica ≈1.52 (instrument measurement).
- Density for auxiliary reference: Borosilicate 2.2‑2.3; soda‑lime‑silica 2.4‑2.6.
On‑site verification to prevent substitution of soda‑lime‑silica for borosilicate glass.
5. Upgraded traceability & acceptance rules
Markings on physical glass, product serial numbers and test‑report numbers must be fully consistent, to avoid mismatch between test reports and delivered goods; a key check item for project acceptance.
6. Test and inspection provisions
‑ Expanded type‑test scope covering sandwich and insulated fire‑resistant glass assemblies. ‑ Removed redundant impact resistance and fragment requirements shared with general safety glass; fire resistance and durability become core test items. ‑ Separate provisions for factory‑release inspection and type test; updated re‑test judgment criteria.
IV. Practical Guidelines for Engineering & Procurement
- Do not rely solely on GB/T 15763.1‑2025. Compliance with mandatory GB 46030‑2025 is required for full regulatory conformity.
- For curtain walls & exterior windows: Prioritize Class B partial‑insulating (W condition). For interior fire doors & partitions: Select Class A insulating (N condition). W‑rated glass cannot substitute N‑rated glass for interior fire separation.
- Procurement checkpoints: Confirm valid updated CCC certification; obtain complete type‑test reports clearly stating Class A/B/C, N/W condition and base material P/NG.
- Incoming inspection: Match engraved serial numbers on glass against test‑report numbers; perform material identification per Appendix A if needed.
- JFB sandwich fire‑resistant glass and ZFB insulated fire‑resistant glass now have formal standard support for project use. Note that framing and sealing components shall also pass corresponding type tests.
- Complete fire‑resistant partition assemblies shall comply with XF 97‑2025. Glass performance alone is insufficient; frames, gaskets and installation gaps also affect fire‑resistance duration.
V. Comparison Table: Key Differences between Old and New Standards
表格
| Item | Old Standard GB 15763.1‑2009 | New Standard GB/T 15763.1‑2025 |
|---|---|---|
| Standard Nature | Mandatory | Recommended; mandatory baseline under GB 46030‑2025 |
| Product Types | FFB composite, DFB monolithic | FFB, DFB, JFB sandwich, ZFB insulated |
| Fire‑Resistance Classes | Class A insulating, Class C non‑insulating | Added Class B partial‑insulating |
| Fire‑Scenario Curves | Not specified | New N‑internal fire / W‑external fire curves |
| Durability Tests | No humidity / cold / radiation resistance | Full set of durability tests required |
| Stress Requirements | Not specified | Stress value & uniformity for soda‑lime‑silica glass |
| Edge‑Processing Rules | No explicit requirements | Mandatory polishing / fine grinding & corner radiusing |
| Product Traceability | Basic marking | Full traceability: match physical marks with test reports |
| Base‑Material Identification | Not provided | Appendix A for on‑site material discrimination |
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