1.PU Sponge Sheet Overview

PU Sponge Sheet, also known as a Polyurethane Sponge Sheet, is a versatile and high-performance material widely used in packaging, cleaning, filtration, sealing, cushioning, and industrial processing. Manufactured from PU foam material, this sponge provides excellent elasticity, durability, and structural stability. With customizable porosity, density (PU foam), and cell structure, PU sponge sheets meet the diverse needs of consumer goods and industrial applications.

2. Material and Physical Characteristics

A PU foam material is created through the reaction of polyols and isocyanates. The resulting structure, PU sponge, dictates its final use:

A. Cell Structure (Porosity)

The defining feature of PU sponge foam is its internal structure, which determines its primary function:

Open Cell PU Foam: The internal cell walls are broken, allowing air and liquids to pass through easily. This high Porosity makes the material ideal for filtration and sound absorption.
Closed Cell PU Foam: The internal cells are fully sealed and separated.This structure prevents the passage of air and water, making it suitable for Sealing Foam and flotation applications.

B. Physical Properties

Key specifications for sourcing PU Foam Sheets include:

Density (PU Foam): Measured in kilograms per cubic meter ( $\text{kg}/\text{m}^3$ ). High Density PU Foam is firmer and offers better load-bearing capacity (e.g., in seating), while low density foam is softer (e.g., Comfort Foam).
Flexibility: Most PU sponge used in sheets is Flexible PU Foam, offering high elasticity and compression.
Compression Set: Measures the material’s ability to return to its original thickness after being compressed for a long period. A low compression set is vital for reliable gasketing materials.

3. Applications and Uses

The versatility of polyurethane pu sponge allows it to replace materials like Foam Rubber in many scenarios:

Application Sector	Key Function	Products and Uses
Sealing & Gasketing	Sealing Foam (often Closed Cell PU Foam)	Used in automotive and electronic enclosures to prevent dust and moisture ingress. Available as Adhesive Backed Foam for easy assembly.
Filtration	Filter Foam (High Porosity Open Cell)	Air conditioning filters, vacuum cleaner filters, and specialized fluid filters. The open-cell structure traps particles effectively.
Cushioning & Packaging	Shock Absorption / Comfort Foam	Protective lining in packaging, furniture seating, bedding, and pu sponge foam inserts for electronics.
Acoustics	Sound Absorbing Foam (Open Cell)	Sound insulation panels, microphone windscreens, and noise dampening in machinery (e.g., using PU Foam Rolls).
Cleaning	PU Cleaning Sponge	Industrial and household scrubbing pads and applicators due to its absorbent and durable structure.

4. Purchasing and Manufacturing

When sourcing Polyurethane Foam Sheet, buyers often look for specific commercial terms:

Product Form: Available as large PU Foam Rolls or smaller, custom-sized pu foam sheet.
Sourcing: Buyers frequently search for Wholesale PU Foam suppliers or ask for the pu foam sheet price list and pu foam sheet price.
Manufacturing: Foam Converter companies specialize in cutting, laminating, and shaping the foam using processes like Sponge Extrusion or die-cutting to create final parts.

To purchase this material, one might search to Buy Polyurethane Foam specifying the required pu foam sheet size and Density (PU Foam).