MH-CHP
MINGHUNG
1. Core Definition
Fire-Rated Fiberboard is an engineered wood product treated with flame retardants or fire-resistant resin systems to meet national/international fire standards. Its essential function is to suppress flame spread, reduce heat release, and minimize toxic smoke during fire exposure, providing critical time for evacuation and firefighting.
2. Key Technical Properties
Property | Requirement |
Flame Retardancy | Oxygen Index (OI) ≥32% |
Flame Spread Control | Flame Spread Index (FSI) ≤25 |
Low Smoke Toxicity | Smoke Density Index (SDI) ≤450 |
Fire Integrity | No penetration after 30min at 800℃ |
3. Fire Retardancy Mechanisms
Gas Phase Action: Retardants release inert gases (N₂, CO₂) to dilute oxygen
Condensed Phase Action: Forms intumescent char layer (e.g. P-N system) as heat barrier
Cooling Effect: Aluminum hydroxide (ATH) decomposition absorbs heat (≈1,000 J/g)
4. Classification by Fire Rating
Standard | Highest Grade | Critical Criteria | Typical Application |
China GB 8624 | A2 (Non-combustible) | Total heat value ≤3MJ/kg | Subway/hospital cores |
EU EN 13501 | B-s1,d0 | FSI≤20, SDI≤50 | Commercial ceilings |
US ASTM E84 | Class A | FSI≤25, SDI≤450 | Marine/data centers |
5. vs. Standard Fiberboard
Parameter | Fire-Rated Fiberboard | Standard Fiberboard |
Retardant Content | 12-18% of fiber weight | 0 |
Heat Release Rate | ≤65kW/m² (cone calorimeter) | ≥150kW/m² |
Char Residue | Dense char layer (≥60% mass) | Ash (≤10% mass) |
Formaldehyde | ≤0.05mg/m³ (stable at high temp) | ≤0.1mg/m³ |
1. Raw Material Processing
Wood Chipping: Debarked logs (pine/eucalyptus) cut into 20-30mm chips, with metal detectors removing impurities
Steam Treatment: Chips cooked in saturated steam at 170℃ for 3-5 minutes to soften lignin
2. Fiber Preparation
Defibration: Softened chips fed into twin-disc refiner under 1.2MPa pressure to separate fibers (length 0.8-1.2mm)
Fiber Drying: Wet fibers dried in triple-pass rotary dryer (inlet 280℃/outlet 75℃), moisture content reduced to 8-10%
3. Flame Retardancy Treatment (Core Step)
Retardant Blending: Dry fibers mixed with phosphorus-nitrogen compound retardant (e.g. APP) in high-speed blender
Dosage: 12-15% of oven-dry fiber weight
Mixing temp: 45-50℃ (prevent resin pre-curing)
Resin Application:
Resin type: Modified melamine-urea-formaldehyde (MUF)
Application rate: 9-11% (includes 1.5% NH₄Cl hardener)
Method: Atomized spraying, fiber surface coverage ≥95%
4. Mat Forming & Pre-pressing
Forming: Air-felt forming machine creates layered mat with density deviation ≤±1.5%
Pre-pressing: Continuous belt pre-press compacts mat to 120% target thickness at 0.8-1.2MPa
5. Hot Pressing
Temperature: 195-205℃ (heated by thermal oil circulation)
Pressure Profile:
Press Zone | Pressure(MPa) | Time(s) | Function |
Entry | 35 | 15 | Rapid compaction |
Middle | 18 | 60 | Resin curing + retardant reaction |
Exit | 5 | 15 | Stress relief |
Total Press Time: 90-110 seconds (fast heat transfer for 3mm thin board)
6. Post-Processing
Cooling: Roller cooler reduces temperature below 40℃ (prevent warping)
Cutting: High-speed crosscut/trim saw cuts to 1220x2440mm (diagonal error ≤2mm)
Sanding: 6-head sander calibrates both sides (P80→P180 grit), thickness tolerance ±0.15mm
Equipment Type | Model/Spec |
Continuous Press | CPS 8-opening 38m-long |
Fiber Dryer | Triple-pass rotary φ4.2x24m |
Forming Machine | SWD-9 Air-felt Head ±1% dev |
Retardant Dosing | Gravimix GMS-300 ±0.5% acc |
Sanding Line | 6-head + CCD Thickness Monitor |
continuous hot press
fiber drying machine
forming machine
sander
Physical Properties:
Density: 850-880kg/m³ (tested)
MOR: ≥45MPa (EN 310)
Fire Rating: ASTM E84 Class A (FSI=20, SDI=300)
Eco-Standards:
Formaldehyde: ≤0.03mg/m³ (EN717-1 E0)
VOC Emission: GREENGUARD Gold certified
Enhanced Fire Resistance: Inorganic retardants form charring barrier at 800℃ (30min fire integrity)
Capacity Guarantee: 150m³/day = 16,800 boards, equipment OEE ≥92%
Cost Efficiency: 30% material saving + 40% shipping space reduction
Industry | Use Case | Key Value Proposition |
Shipbuilding | A-class fire bulkhead/ceiling | IMO FTPC Part 5 certified |
Data Centers | Server cabinet fire lining | Flame retardant + ESD treated |
Rail Transit | High-speed train partition panels | Lightweight (6.5kg/m²) |
Military Facilities | Blast-resistant wall core | Impact absorption ≥15kJ/m² |
Don't Hesitate! Inquire Now & Enjoy Fast Response (24/7 Support)!
Whatsapp: +8618769900191 +8615589105786 +8618954906501
Email: osbmdfmachinery@gmail.com
1. Core Definition
Fire-Rated Fiberboard is an engineered wood product treated with flame retardants or fire-resistant resin systems to meet national/international fire standards. Its essential function is to suppress flame spread, reduce heat release, and minimize toxic smoke during fire exposure, providing critical time for evacuation and firefighting.
2. Key Technical Properties
Property | Requirement |
Flame Retardancy | Oxygen Index (OI) ≥32% |
Flame Spread Control | Flame Spread Index (FSI) ≤25 |
Low Smoke Toxicity | Smoke Density Index (SDI) ≤450 |
Fire Integrity | No penetration after 30min at 800℃ |
3. Fire Retardancy Mechanisms
Gas Phase Action: Retardants release inert gases (N₂, CO₂) to dilute oxygen
Condensed Phase Action: Forms intumescent char layer (e.g. P-N system) as heat barrier
Cooling Effect: Aluminum hydroxide (ATH) decomposition absorbs heat (≈1,000 J/g)
4. Classification by Fire Rating
Standard | Highest Grade | Critical Criteria | Typical Application |
China GB 8624 | A2 (Non-combustible) | Total heat value ≤3MJ/kg | Subway/hospital cores |
EU EN 13501 | B-s1,d0 | FSI≤20, SDI≤50 | Commercial ceilings |
US ASTM E84 | Class A | FSI≤25, SDI≤450 | Marine/data centers |
5. vs. Standard Fiberboard
Parameter | Fire-Rated Fiberboard | Standard Fiberboard |
Retardant Content | 12-18% of fiber weight | 0 |
Heat Release Rate | ≤65kW/m² (cone calorimeter) | ≥150kW/m² |
Char Residue | Dense char layer (≥60% mass) | Ash (≤10% mass) |
Formaldehyde | ≤0.05mg/m³ (stable at high temp) | ≤0.1mg/m³ |
1. Raw Material Processing
Wood Chipping: Debarked logs (pine/eucalyptus) cut into 20-30mm chips, with metal detectors removing impurities
Steam Treatment: Chips cooked in saturated steam at 170℃ for 3-5 minutes to soften lignin
2. Fiber Preparation
Defibration: Softened chips fed into twin-disc refiner under 1.2MPa pressure to separate fibers (length 0.8-1.2mm)
Fiber Drying: Wet fibers dried in triple-pass rotary dryer (inlet 280℃/outlet 75℃), moisture content reduced to 8-10%
3. Flame Retardancy Treatment (Core Step)
Retardant Blending: Dry fibers mixed with phosphorus-nitrogen compound retardant (e.g. APP) in high-speed blender
Dosage: 12-15% of oven-dry fiber weight
Mixing temp: 45-50℃ (prevent resin pre-curing)
Resin Application:
Resin type: Modified melamine-urea-formaldehyde (MUF)
Application rate: 9-11% (includes 1.5% NH₄Cl hardener)
Method: Atomized spraying, fiber surface coverage ≥95%
4. Mat Forming & Pre-pressing
Forming: Air-felt forming machine creates layered mat with density deviation ≤±1.5%
Pre-pressing: Continuous belt pre-press compacts mat to 120% target thickness at 0.8-1.2MPa
5. Hot Pressing
Temperature: 195-205℃ (heated by thermal oil circulation)
Pressure Profile:
Press Zone | Pressure(MPa) | Time(s) | Function |
Entry | 35 | 15 | Rapid compaction |
Middle | 18 | 60 | Resin curing + retardant reaction |
Exit | 5 | 15 | Stress relief |
Total Press Time: 90-110 seconds (fast heat transfer for 3mm thin board)
6. Post-Processing
Cooling: Roller cooler reduces temperature below 40℃ (prevent warping)
Cutting: High-speed crosscut/trim saw cuts to 1220x2440mm (diagonal error ≤2mm)
Sanding: 6-head sander calibrates both sides (P80→P180 grit), thickness tolerance ±0.15mm
Equipment Type | Model/Spec |
Continuous Press | CPS 8-opening 38m-long |
Fiber Dryer | Triple-pass rotary φ4.2x24m |
Forming Machine | SWD-9 Air-felt Head ±1% dev |
Retardant Dosing | Gravimix GMS-300 ±0.5% acc |
Sanding Line | 6-head + CCD Thickness Monitor |
continuous hot press
fiber drying machine
forming machine
sander
Physical Properties:
Density: 850-880kg/m³ (tested)
MOR: ≥45MPa (EN 310)
Fire Rating: ASTM E84 Class A (FSI=20, SDI=300)
Eco-Standards:
Formaldehyde: ≤0.03mg/m³ (EN717-1 E0)
VOC Emission: GREENGUARD Gold certified
Enhanced Fire Resistance: Inorganic retardants form charring barrier at 800℃ (30min fire integrity)
Capacity Guarantee: 150m³/day = 16,800 boards, equipment OEE ≥92%
Cost Efficiency: 30% material saving + 40% shipping space reduction
Industry | Use Case | Key Value Proposition |
Shipbuilding | A-class fire bulkhead/ceiling | IMO FTPC Part 5 certified |
Data Centers | Server cabinet fire lining | Flame retardant + ESD treated |
Rail Transit | High-speed train partition panels | Lightweight (6.5kg/m²) |
Military Facilities | Blast-resistant wall core | Impact absorption ≥15kJ/m² |
Don't Hesitate! Inquire Now & Enjoy Fast Response (24/7 Support)!
Whatsapp: +8618769900191 +8615589105786 +8618954906501
Email: osbmdfmachinery@gmail.com
