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Slow Rebound PORON 4790-92 Series Extremely Soft Foam Material

PORON 4790-92 is a high-performance polyurethane (PU) slow rebound foam developed by Rogers Corporation, which has become the ideal cushioning material for many designers and engineers in precision manufacturing and high-end applications. 4790-92 series foam has a soft texture and a slow rebound rate, which allows it to fit tightly into a variety of products, while slowly returning to its original shape after pressure to ensure long-term performance. The soft texture and slow rebound of the 4790-92 series of foams allows them to fit tightly into a wide range of products, while their slow recovery after pressure ensures long-term performance. Whether used as a cushioning material or a seal, it provides reliable performance.

PORON 4790-92 Foam Material Characteristics

PropertiesDescription
DensityExtremely low density (~0.09-0.12g/cm3), ultra-lightweight
Hardness (AskerC)Extremely soft (<10) for a gentle touch
Compression Deformation (25%)Extremely low rebound force, slow recovery (slow return characteristic)
DurabilityStrong fatigue resistance, maintains unidimensionality after long term compression
Temperature AdaptabilityStable use from -20°C to +70°C
Flame RetardantSome models meet UL94HF-1 flame retardant standard.
Chemical StabilityResistant to oil and sweat, suitable for wearable devices

Core Benefits of PORON 4790-92 Foam Material

  • Ultra Soft Cushioning - Extremely low stiffness for applications that require a comfortable fit (e.g. headphone ear cushions, wearable devices).
  • Energy Absorption - Effectively disperses impacts and protects delicate components (e.g. cell phone/tablet shock pads).
  • Long-term stability - Resist permanent deformation, long service life (better than ordinary EVA or memory foam).
  • Customized Processing - Can be die-cut, stamped, and back-glued to suit different structural needs.

Typical applications for PORON 4790-92 foam

Consumer Electronics

  • Headphone/earbud cushion (enhances wearing comfort)
  • Smartphone/tablet cushioning (reduce drop impact)
  • Smartwatch/bracelet cushioning (conforms to skin and resists perspiration)

Medical & Rehabilitation

  • Orthopedic shoe cushions (cushioning and pressure reduction)
  • Wheelchair cushions (reduce long-term compression)
  • Medical sensor cushioning (improves fit)

Automotive & Industrial

  • Automotive seat comfort layer (reduces long distance fatigue)
  • Precision instrument shock pads (anti-vibration shock)
  • Battery cushion isolation sheet (prevents extrusion short circuit)

Comparison of PORON 4790-92 with other foam materials

MaterialHardness（Asker C）Rebound speedTypical applications
PORON 4790-92<10°Slow reboundUltra-light and flexible cushioning (wearables, medical)
Ordinary PU foam20°– 40°Medium ReboundPackaging, general shock absorption
EVA foam30°– 60°Fast ReboundShoe insoles, sports equipment
Memory foam10°– 25°Slow ReboundMattresses, pillows

PORON 4790-92 Processing and Customization Options

  • Die-cutting - Precision cutting into complex shapes (e.g., shaped seals).
  • Adhesive Backing - Acrylic or silicone adhesive systems are available to enhance adhesion.
  • Composite lamination - can be combined with non-woven fabrics, PET films, etc. to enhance structural strength.

Frequently Asked Questions (FAQ)

Is PORON 4790-92 suitable for high temperature environment?

  • No. It is suitable for long-term use up to 70°C, and can withstand 100°C for short-term use (e.g., short exposure during reflow soldering).

What are the advantages of PORON over memory foam?

  • PORON has lower compression set, longer life, and is less prone to moisture absorption, making it suitable for precision electronics and medical applications.

Are there any environmental certifications?

  • RoHS and REACH compliant, and some models support bio-based materials (customized).
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