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I. What is Fire-Resistant Glass?
Fire-resistant glass is a specialized type of glass that meets specific fire resistance requirements. It provides protection and insulation in the event of a fire, isolating the source of fire, limiting the spread of fire, and blocking the spread of smoke, creating favorable conditions for escape or waiting for rescue. Ordinary glass used in glass doors and windows is susceptible to shattering and cracking when exposed to high temperatures, causing fire and smoke to spread rapidly, leading to disasters. The current mandatory national standard for fire-resistant glass in my country is GB 15763.1-2009, “Safety Glass for Buildings – Part 1: Fire-Resistant Glass.”
II. Classification of Fire-Resistant Glass Products
(I) Fire-Resistant Glass by Structure:
Single-Ply Fire-Resistant Glass (DFB): Consists of a single layer of glass, generally providing only fire-resistant integrity, but capable of blocking the spread of flames and smoke. It is lightweight, transparent, and strong, and is suitable for fire-resistant glass partitions and fire-resistant windows.
Composite Fire-Resistant Glass (FFB): Consists of two or more layers of glass, or a layer of glass and an organic material. Compared to single-pane fire-resistant glass, it offers superior fire protection, heat insulation, and sound insulation. Common products include laminated composite fire-resistant glass, insulated fire-resistant glass, and wired fire-resistant glass.
2. Fire-resistant glass classification by fire resistance performance:
Fire-resistant glass can be divided into two categories based on fire resistance performance: thermally insulating fire-resistant glass (Class A) and non-thermally insulating fire-resistant glass (Class C). Thermally insulating fire-resistant glass (Class A) meets both fire integrity and fire insulation requirements; non-thermally insulating fire-resistant glass (Class C) meets only fire integrity requirements.
3. Fire-resistant glass classification by fire resistance limit:
Fire-resistant glass can be divided into five grades based on fire resistance limit: 0.50h, 1.00h, 1.50h, 2.00h, and 3.00h.
4. Fire-resistant glass product classification:
For fire-resistant glass products, the product classification can be determined based on the markings on the product.
Fire-Resistant Glass Purchasing Recommendations
When choosing fire-resistant glass, consumers should consider the following points to ensure they receive products that meet their safety needs:
1. Fire-resistant glass complies with the mandatory national standard GB15763.1-2009, “Safety Glass for Buildings – Part 1: Fire-Resistant Glass,” and is a voluntary certified product. When selecting products, consumers should identify the standard code, prioritize certified products, and request the voluntary certification certificate and test report.
2. In accordance with the mandatory national standard GB15763.1-2009, each piece of fire-resistant glass must have an indelible product mark, company name, or trademark in the lower right corner. The following are examples of product markings: ① Composite insulating fire-resistant glass with a nominal thickness of 25mm, fire resistance rating of insulation (Class A), and a fire resistance rating of 1.50h is marked FFB-25-A1.50; ② Single-pane non-insulating fire-resistant glass with a nominal thickness of 12mm, fire resistance rating of non-insulating (Class C), and a fire resistance rating of 1.00h is marked DFB-12-C1.00.
3. Select the appropriate fire resistance rating based on actual needs. Different locations and uses may require fire-resistant glass with different fire resistance ratings.
4. Select the appropriate structure based on the specific application scenario and fire protection system requirements. Whether insulation is required determines whether composite insulating fire-resistant glass or single-pane non-insulating fire-resistant glass is appropriate.
5. Inspect the exterior surface of the fire-resistant glass for obvious defects such as bubbles, cracks, and discoloration of the laminated glass.