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Flame Retardant Polyester Polyol Series comprises specialty polyols engineered to enhance fire resistance in polyurethane (PU) formulations, eliminating or reducing the need for additional halogenated flame retardants. These polyols integrate phosphorus, nitrogen, or intumescent additives into their molecular structure, with flame-retardant element content ranging from 8–15% depending on the grade. With a hydroxyl number of 200–450 mg KOH/g and functionality of 2.5–3.5, they are compatible with MDI, TDI, and PIR systems, forming rigid or flexible foams with UL 94 V-0 or ASTM E84 Class 1 fire ratings. Their low viscosity (3,000–15,000 cps at 25°C) ensures ease of processing in spray, pour, and injection molding applications.
Integrated Flame Retardancy
The covalently bonded flame-retardant groups prevent additive migration, maintaining consistent fire performance over time. This reduces heat release rate (HRR) by 30–50% compared to non-flame-retardant polyols, as verified by cone calorimeter tests (ISO 5660).
Balanced Mechanical and Fire Properties
Unlike additive-based systems, these polyols retain mechanical strength: rigid foams exhibit compressive strength ≥1.2 MPa, while flexible grades maintain elongation at break ≥300%. They resist thermal degradation up to 200°C, ensuring stability in high-temperature environments.
Environmental Compliance
Free from brominated compounds and heavy metals, they comply with REACH Annex XVII and California Proposition 65. Their low VOC emissions (≤10 ppm) meet UL GREENGUARD Gold standards, suitable for indoor applications like building insulation.
Formulation Flexibility
Available in rigid (high functionality) and flexible (linear structure) grades, they adapt to diverse needs:
Rigid grades optimize char formation for insulation panels.
Flexible grades balance elasticity and fire resistance for upholstery foams.
Building and Construction
Spray Foam Insulation: Used in wall cavities and attics, achieving flame spread index ≤25 (ASTM E84) and thermal conductivity (λ-value ≤0.024 W/m·K).
Structural Panels: Enhances fire resistance in PIR sandwich panels for commercial roofing, with fire penetration resistance ≥60 minutes (EN 13501-1).
Electronics and Transportation
Electronic Packaging: Provides fire barrier protection for server racks and battery enclosures, meeting UL 94 V-0 at 1.6mm thickness.
Automotive Interiors: Used in seat cushions and door panels, complying with FMVSS 302 (flame spread ≤100mm/min).
Industrial Equipment
Appliance Insulation: Insulates refrigerators and ovens, combining fire resistance with energy efficiency (λ-value ≤0.022 W/m·K).
Cable Jacketing: Enhances flame retardancy in PU-coated cables, passing IEC 60332-1-2 (vertical flame test).
Container: Store in stainless steel or HDPE drums to prevent contamination.
Conditions: Maintain temperatures at 10–35°C with humidity ≤60%, away from direct sunlight.
Handling: Avoid contact with strong oxidizing agents and acids, which may degrade flame-retardant groups.
Parameter | Rigid Grade | Flexible Grade |
Appearance | Amber viscous liquid | Light yellow liquid |
Hydroxyl Number | 350–450 mg KOH/g | 200–300 mg KOH/g |
Viscosity (25°C) | 8,000–15,000 cps | 3,000–6,000 cps |
Functionality | 3.0–3.5 | 2.5–2.8 |
Flame Rating | UL 94 V-0 | UL 94 V-2 |
Density (25°C) | 1.05–1.10 g/cm³ | 1.00–1.05 g/cm³ |
Flame Retardant Polyester Polyol Series comprises specialty polyols engineered to enhance fire resistance in polyurethane (PU) formulations, eliminating or reducing the need for additional halogenated flame retardants. These polyols integrate phosphorus, nitrogen, or intumescent additives into their molecular structure, with flame-retardant element content ranging from 8–15% depending on the grade. With a hydroxyl number of 200–450 mg KOH/g and functionality of 2.5–3.5, they are compatible with MDI, TDI, and PIR systems, forming rigid or flexible foams with UL 94 V-0 or ASTM E84 Class 1 fire ratings. Their low viscosity (3,000–15,000 cps at 25°C) ensures ease of processing in spray, pour, and injection molding applications.
Integrated Flame Retardancy
The covalently bonded flame-retardant groups prevent additive migration, maintaining consistent fire performance over time. This reduces heat release rate (HRR) by 30–50% compared to non-flame-retardant polyols, as verified by cone calorimeter tests (ISO 5660).
Balanced Mechanical and Fire Properties
Unlike additive-based systems, these polyols retain mechanical strength: rigid foams exhibit compressive strength ≥1.2 MPa, while flexible grades maintain elongation at break ≥300%. They resist thermal degradation up to 200°C, ensuring stability in high-temperature environments.
Environmental Compliance
Free from brominated compounds and heavy metals, they comply with REACH Annex XVII and California Proposition 65. Their low VOC emissions (≤10 ppm) meet UL GREENGUARD Gold standards, suitable for indoor applications like building insulation.
Formulation Flexibility
Available in rigid (high functionality) and flexible (linear structure) grades, they adapt to diverse needs:
Rigid grades optimize char formation for insulation panels.
Flexible grades balance elasticity and fire resistance for upholstery foams.
Building and Construction
Spray Foam Insulation: Used in wall cavities and attics, achieving flame spread index ≤25 (ASTM E84) and thermal conductivity (λ-value ≤0.024 W/m·K).
Structural Panels: Enhances fire resistance in PIR sandwich panels for commercial roofing, with fire penetration resistance ≥60 minutes (EN 13501-1).
Electronics and Transportation
Electronic Packaging: Provides fire barrier protection for server racks and battery enclosures, meeting UL 94 V-0 at 1.6mm thickness.
Automotive Interiors: Used in seat cushions and door panels, complying with FMVSS 302 (flame spread ≤100mm/min).
Industrial Equipment
Appliance Insulation: Insulates refrigerators and ovens, combining fire resistance with energy efficiency (λ-value ≤0.022 W/m·K).
Cable Jacketing: Enhances flame retardancy in PU-coated cables, passing IEC 60332-1-2 (vertical flame test).
Container: Store in stainless steel or HDPE drums to prevent contamination.
Conditions: Maintain temperatures at 10–35°C with humidity ≤60%, away from direct sunlight.
Handling: Avoid contact with strong oxidizing agents and acids, which may degrade flame-retardant groups.
Parameter | Rigid Grade | Flexible Grade |
Appearance | Amber viscous liquid | Light yellow liquid |
Hydroxyl Number | 350–450 mg KOH/g | 200–300 mg KOH/g |
Viscosity (25°C) | 8,000–15,000 cps | 3,000–6,000 cps |
Functionality | 3.0–3.5 | 2.5–2.8 |
Flame Rating | UL 94 V-0 | UL 94 V-2 |
Density (25°C) | 1.05–1.10 g/cm³ | 1.00–1.05 g/cm³ |
