Class A Fire ResistanceApplications1. Exterior wall insulation for buildings with Class A fire resistance requirements2. Extremely cold and cold regions with high energy efficiency requirements3. Buil...
Class A Fire Resistance
Applications
1. Exterior wall insulation for buildings with Class A fire resistance requirements
2. Extremely cold and cold regions with high energy efficiency requirements
3. Buildings with 83% energy efficiency and near-zero energy consumption
No fireproof doors or windows required
No fire-resistant firebreaks required
Insulation materials do not need to be Class A
Application height not limited
Unrestricted location
Product Specifications
Standard Size: 1200mm*600mm (Customizable)
Insulation Layer Thickness: 60mm-150mm
PRF rock wool composite polyurethane fireproof insulation board
Rock wool composite polyurethane fireproof insulation board is a new generation of insulation product that integrates thermal insulation and fireproofing. It is manufactured using continuous foaming technology, where rigid polyurethane foam is foamed between vertical rock wool fibers and reinforcing membrane. Utilizing the permeability and self-adhesive properties of polyurethane, it is pre-formed into a composite material. (Abbreviation: PRF board)
The thickness of the vertical rock wool board should not be less than 45mm, and the polyurethane thickness can be calculated and determined based on the heat transfer coefficient requirements of the wall.
Product Features
Excellent Fire Resistance
The system features a 50mm thick protective layer on the outside. The rock wool in the system's structural layer prevents heat and oxygen from transferring into the polyurethane filling, thus preventing oxidation of the polyurethane material and giving the entire system stable fire resistance and the ability to withstand heat radiation.
| Standard requirements | Rock wool composite polyurethane fireproof insulation board |
| The fire performance of thermal insulation materials shall not be lower than Class B₂. | Polyurethane has a combustion rating of B₂ or B. |
| The walls on both sides of the insulation material should be made of non-combustible materials and the thickness of each should not be less than 50mm. | Reinforced concrete or masonry walls ≥50mm; rock wool + plastering layer ≥50mm |
| There are no cavities between the insulation material and the walls on both sides. | Traditional thin plastering technique, no cavities |
1. Insulate against flames and heat transfer
2. Reduce oxygen content
Relevant standards: When the exterior walls of a building are constructed using insulation materials to form a cavity-free composite insulation structure with the side walls, the fire resistance rating of this structure shall comply with the relevant provisions of GB 50016; When the combustion performance of the insulation material is Class B or B₂, the walls (or protective layers) on both sides of the insulation material shall be made of non-combustible materials and their thickness shall not be less than 50mm.
-------- Excerpt from 6.7.3 of GB 50016, "Code for Fire Protection Design of Buildings".
Window fire test:
Test method: GB/T 29416 Fire test method for external wall insulation systems of buildings.
Sample: 20mm rigid polyurethane foam + 45mm rock wool
Test results: The system showed good integrity; the polyurethane surface carbonization did not result in combustion; and the rock wool on the outer surface effectively blocked the spread of flames and slowed down heat transfer.
Product Features
Superior Mechanical Properties
PRF boards are AB structure insulation boards formed in one step on a continuous production line by directly pouring polyurethane onto vertical rock wool using microporous infiltration self-adhesive foaming technology. This ensures 100% cavity-free connections, guaranteeing greater integrity and overall product stability, significantly improving the durability and stability of the product's overall mechanical properties.
Repairability of Polyurethane: Liquid polyurethane penetrates into the voids in the rock wool, repairing broken fibers caused by cutting or impact on the rock wool surface, thus preserving the rock wool's inherent strength.
Moisture and Water Resistant
During the production process, liquid polyurethane penetrates into the rock wool to form a continuous, closed-loop waterproof isolation layer. This fully utilizes the excellent waterproof properties of polyurethane, overcoming the shortcomings of rock wool's susceptibility to moisture absorption and deliquescence, thus improving the waterproof performance of the PRF board. Simultaneously, the inner polyurethane insulation layer isolates the rock wool from moisture, ensuring the material's long-lasting insulation performance.
Note: Especially regarding indoor water vapor, analysis of rock wool detachment and cracking issues initially revealed problems on masonry walls, particularly those without leveling.
Low Thermal Transfer Coefficient, No Thermal Bridge Effect
Low thermal transfer coefficient: The low thermal conductivity and excellent insulation properties of rigid polyurethane foam compensate for the high thermal conductivity and poor insulation performance of single-layer rock wool boards.
No thermal bridge impact: Compared with GL, FS and LTS structural systems, rock wool composite polyurethane fireproof insulation board external wall insulation system can cover the thermal bridge parts of balconies, rain shelters, cantilevered components, etc., and there are no thermal bridge holes left by through bolts during formwork. It does not cross construction with the main structure and is simple to operate.
Infrared imager measured image
Class A Fire Resistance Applications:
1. Exterior wall insulation for buildings requiring Class A fire resistance.
2. Extremely cold and frigid regions with high energy efficiency requirements.
3. Buildings with 83% energy efficiency and near-zero energy consumption.
High interface strength
The PRF board has interface-reinforced roll material laminated on both the upper and lower surfaces, eliminating the need for on-site interface agent application. It is manufactured in a single step using a fixed-length laminator, resulting in minimal dimensional deviations, excellent flatness, and a thin finish layer, reducing the amount of auxiliary materials used and simplifying construction.
Simple construction process, short construction period, and low overall system cost.
Energy-Saving Design
The ultra-low thermal conductivity and excellent insulation properties of rigid polyurethane foam compensate for the high thermal conductivity and poor insulation performance of single rock wool boards. It easily meets the design requirements of 83% building energy efficiency and near-zero energy consumption building energy efficiency standards.
Thermal parameters of rock wool composite polyurethane fireproof insulation board:
1. Polyurethane thermal conductivity: 0.020~0.024 W/(m·K), correction factor 1.10;
2. Rock wool strip thermal conductivity: 0.045 W/(m·K), outdoor correction factor 1.10 for severely cold and cold regions;
3. Other parameters refer to GB50176 Appendix-B, GB/T51350
| Heat transfer coefficient | Reinforced concrete (mm) | Rock wool board (mm) | Rock wool composite polyurethane fireproof insulation board (mm) | |
| PU | RF | |||
| 0.30 | 200 | 135 | 55 | 45 |
| 0.20 | 200 | 210 | 95 | 45 |
| 0.15 | 200 | 285 | 135 | 45 |
| 0.10 | 200 | 430 | 215 | 45 |
| The equivalent thermal resistance of the inner and outer surfaces of the wall is 0.15. | ||||
Wind Load Resistance Design
The system's safety is primarily affected by wind pressure and its own weight. The rock wool composite polyurethane fireproof insulation board external wall insulation system employs a "bonding + anchoring" fixing method, prioritizing bonding and supplementing with anchoring. The principle is that no anchoring should sacrifice bond strength.
Auxiliary anchors provide stability before the adhesive fully hardens and serve as temporary connections to prevent detachment. After the adhesive solidifies, the various anchors become a safety reserve for the insulation board's fixation, ensuring that even under the most unfavorable conditions (complete adhesive detachment), the boards will not fall off, guaranteeing the system's safety and reliability.
System Showcase
The PRF rock wool composite polyurethane fireproof insulation board external wall insulation system consists of PRF boards, adhesives, plastic expansion anchors (if necessary), alkali-resistant fiberglass mesh, plastering mortar, flexible water-resistant putty, and finishing materials. It is suitable for installation on the exterior wall surface of buildings for non-load-bearing structures that provide thermal insulation and decoration.
1. Base wall
2. Adhesive
3. PRF insulation board
4. Disc anchors
5. Fiberglass mesh embedded in finishing mortar
6. Decorative layer
The shortcomings of traditional integrated thermal insulation and fire protection systems for building structures:
They involve frequent cross-construction with civil engineering and steel reinforcement, leading to complex construction.
They generally have low shear strength and poor seismic resistance.
The thermal performance of cantilevered parts such as beams, columns, and balconies is insufficient.
Concrete experiences high lateral pressure, making it prone to deformation.
The technical means for infill walls are limited, preventing the realization of integrated thermal insulation and fire protection for the building structure.
Construction key points
Base wall inspection and treatment --- setting control lines and mixing adhesive --- pasting insulation boards --- anchoring insulation boards --- plastering layer construction --- exterior finish construction
Cases
Case Study - Wanhua Chemical Talent Center Project
Case Study - Affiliated High School of Inner Mongolia Normal University
Case Study - East China Electronics Project
