Introduction

PORON 4790-92 is a type of polyurethane material that offers excellent properties for a wide range of applications. In this article, we will discuss the key features and benefits of PORON 4790-92 and provide an overview of its typical uses.

Key Properties

PORON 4790-92 has the following key properties:

High Resilience

PORON 4790-92 has a very high resilience of 92%, meaning it returns to its original shape and thickness after compression extremely well. This gives it excellent shock absorption and vibration damping abilities.

Low Compression Set

PORON 4790-92 has a low compression set of just 7%, meaning it retains its original thickness very well after prolonged compression. This makes it suitable for applications where consistent cushioning is required.

Open Cell Structure

The open cell structure of PORON 4790-92 allows air to flow through it freely. This aids breathability in cushioning applications.

Low Density

With a density of just 0.47 g/cm3, PORON 4790-92 is extremely lightweight while still providing effective cushioning and impact absorption.

Temperature Stability

PORON 4790-92 retains its cushioning properties well across a wide temperature range from -40°C to 105°C.

Property	Value
Density	0.47 g/cm3
Resilience	92%
Compression Set	7%
Temperature Range	-40°C to 105°C

Applications

With its unique set of properties, PORON 4790-92 is suitable for the following applications:

• Cushioning in footwear: The high resilience provides excellent shock absorption and energy return for comfortable footwear midsoles. The low compression set ensures consistent cushioning over time.
• Padding in helmets and protective gear: Effective at absorbing shock and dissipating impact forces, helping protect the wearer from injury. Remains soft and flexible even at low temperatures.
• Acoustic insulation: Open cell structure absorbs sound effectively. Can reduce noise in appliances, automotive components and industrial equipment.
• Vibration damping: Excellent vibration damping properties make it suitable for automotive bushings and machinery mounts to reduce vibration transmission.

Frequently Asked Questions

What are the major benefits of PORON 4790-92?

The key benefits of PORON 4790-92 are its very high resilience for excellent shock absorption, low compression set for consistent cushioning performance, open cell structure for breathability, lightweight low density design, and temperature stability across a wide range.

What thickness is PORON 4790-92 typically available in?

PORON 4790-92 can be supplied in thicknesses ranging from 1/16 inch to over 1 inch thick. Thinner sheets are commonly used in footwear components, while thicker blocks are used for cushioning pads and sound insulation.

Does PORON 4790-92 require any special care or maintenance?

PORON 4790-92 is generally maintenance free in most applications. It can be wiped clean with soap and water if needed. Avoid contact with solvents or oils that could be absorbed into the open cell structure.

Is PORON 4790-92 available in different densities?

Yes, PORON polyurethane foams are available in a wide range of densities from ultra-low 0.12 g/cm3 up to higher densities around 0.64 g/cm3 for more firm support applications. The 4790 series indicates a 0.47 g/cm3 density.

Does PORON 4790-92 come in different colors?

PORON can be made in a variety of customer specified colors by adding pigments during manufacturing. Natural PORON is off-white in color. Darker colors may reduce sunlight and UV resistance.