XINFA Poyurethane Manufacture Supply Rigid Foam Polyester Polyol For Spraying Foam

Rigid polyester polyols are widely used in closed-cell spray polyurethane foam (SPF) systems for insulation, roofing, tanks, and cold storage applications. Compared with polyether systems, polyester-based spray foams offer higher compressive strength and better fire performance, making them suitable for demanding insulation projects.

1️⃣ Typical Technical Specifications

Higher OH value → higher crosslink density → better compressive strength.

2️⃣ Performance Characteristics in Spray Foam

✔ Fast reactivity (short cream & gel time)
✔ Fine closed-cell structure
✔ High compressive strength (200–350 kPa typical)
✔ Good adhesion to metal & concrete
✔ Better dimensional stability
✔ Improved fire behavior vs polyether systems

3️⃣ Raw Materials Commonly Used

Rigid polyester polyols are typically synthesized from:

• Aromatic acids (e.g., phthalic anhydride)

• Glycols (DEG, EG)

• Recycled PET (cost-effective rigid grades)

• Small amount of crosslinkers for functionality control

Aromatic content enhances fire performance and rigidity.

4️⃣ Typical Spray Foam Formulation (Example)

Polyol Side (Component B):

• Rigid polyester polyol: 100 pbw

• Blowing agent (cyclopentane or HFO): 8–15 pbw

• Water: 1.5–3.0 pbw

• Silicone surfactant: 1.5–2.5 pbw

• Amine catalyst: 1.0–2.0 pbw

• Tin catalyst (e.g., Stannous octoate): 0.2–0.5 pbw

• Flame retardant (if required): 10–20 pbw

Isocyanate Side (Component A):

• Polymeric MDI

• ISO index: 110–130 (PU spray foam)

5️⃣ Key Processing Parameters

• Material temperature: 20–25°C

• Spray pressure: 100–150 bar (high-pressure machine)

• Substrate moisture must be controlled

• Good mixing ratio control is critical

6️⃣ Advantages vs Polyether Polyol in Spray Foam

If you are developing spray insulation foam, I can help you with:

• Optimized formulation for tropical climate (important in Vietnam)

• Low-density roofing spray system

• High-density structural spray foam

• Pentane vs HFO blowing comparison

• TDS specification sheet template for customers