Polyurethane PU foam sheets

What is polyurethane foam sheet used for?

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Polyurethane (PU) foam sheets are everywhere once you start looking: from the weathertight seals on your windows to the cozy insoles in your favorite shoes. At Yongjiu, we specialize in crafting high-quality PU foam sheets that serve a surprising variety of purposes-whether you need airtight barriers in construction, thermal control in appliances, or dependable cushioning in footwear. Let’s explore the many ways flexible PU foam can enhance your products and projects.

1. Assembly of Doors & Windows

When you snap a window frame into place or secure a door to its jamb, PU foam sheets often live behind the scenes, filling gaps and creating a snug fit. As the foam reacts with moisture in the air, it expands to seal out drafts and moisture, improving energy efficiency in homes and commercial buildings.

  • Key Benefit: Creates a continuous, waterproof barrier
  • Why PU? Rapid expansion on application, excellent adhesion
Polyurethane foam PU foam sheets

2. Sound & Heat Insulation

Open-cell PU foam is a lightweight hero in both acoustic and thermal insulation. The cellular structure traps air, reducing sound transmission and slowing heat flow. This makes PU foam ideal for:

  • Wall and ceiling panels in recording studios or offices
  • HVAC duct insulation to improve system efficiency and reduce noise

3. Waterproof & Fire-Resistant Barriers

Certain PU foam formulations include fire-retardant additives that help slow the spread of flames. Combined with waterproofing qualities, these sheets are perfect for:

  • Roof underlayment in rainy climates
  • Fire-rated construction joints that must remain sealed under extreme conditions

4. General Infilling Applications

Anywhere you spot a visible crack or gap-around piping, between prefabricated building panels, or in industrial equipment PU foam sheets can be cut to size and pressed into place. As they expand, they create a tight fit that eliminates vibration and adds structural stability.

5. Rapid, Reactive Application

One of PU foam’s standout features is its fast-acting chemistry. Unlike silicone sealants or rubber gaskets, PU foam:

  • Sprays or inserts in a semi-liquid form
  • Expands up to three times its original volume when it hits moisture
  • Cures into a resilient, closed-cell or open-cell sheet

This speed makes it a favorite among installers who need reliable, one-step solutions

Why Choose Yongjiu’s PU Foam Sheets?

  • Custom Thickness & Density: From 2 mm for delicate seals to 50 mm for heavy-duty insulation.
  • Precise Cutting: Rolls up to 40 m long, widths from 1.4–1.5 m, no-joint slicing for perfect fit.
  • Eco-Conscious Options: Select up to 15 % recycled content or bio-based polyols.
  • B2B-Friendly Terms: FOB Xiamen shipping, 30 % T/T deposit (70 % balance on B/L), MOQ 22.4 m³, 5–7 day lead times.

From weather stripping to soundproofing and fire-blocking, PU foam sheets are an indispensable tool for engineers, builders, and product designers. At Yongjiu, we’re committed to delivering top-tier foam materials that meet your exact specifications—every batch, every sheet.

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