When selecting open cell EPDM foam for sealing, cushioning, sound absorption, or industrial applications, density is one of the most important factors to consider.

Many customers ask:

Does higher density mean better performance?

The answer is not always.

The correct EPDM foam density depends on the application requirements, including compression force, softness, gap filling ability, sealing performance, vibration absorption, and environmental conditions.

AITO Foam provides open cell EPDM foam in different density options, including 65 kg/m³, 80 kg/m³, 90 kg/m³, and 120 kg/m³, to meet different industrial requirements. Aito Foam

What Does EPDM Foam Density Mean?

Density refers to the weight of foam material per cubic meter (kg/m³).

For example:

• 65 kg/m³ EPDM foam means one cubic meter of foam weighs approximately 65 kg.

• 120 kg/m³ EPDM foam means one cubic meter of foam weighs approximately 120 kg.

Higher density generally means:

• More material structure

• Higher support capability

• Better resistance to compression deformation

However, density does not directly represent hardness.

A high-density foam can still be flexible, while a lower-density foam may provide better cushioning performance depending on the formulation and cell structure.

Density vs Hardness vs Compression Performance

When choosing EPDM foam, customers should consider three different factors:

1. Density

Density affects:

• Material structure

• Durability

• Support capability

2. Hardness

Hardness affects:

• Touch feeling

• Resistance against indentation

• Compression force

3. Compression Performance

Compression performance determines:

• Sealing ability

• Gap filling

• Recovery after compression

For sealing applications, choosing the correct balance between softness and support is more important than simply selecting the highest density.

65 kg/m³ Open Cell EPDM Foam

65 kg/m³ EPDM foam is the softest option among common open cell EPDM foam densities.

It provides:

• Excellent flexibility

• Low compression force

• Good cushioning performance

• Easy fitting into irregular gaps

Typical applications:

• Lightweight sealing

• Cushion pads

• Sound absorption

• General industrial protection

65 kg/m³ foam is suitable when the application requires a soft material that can easily compress and adapt to uneven surfaces. Aito Foam

80 kg/m³ Open Cell EPDM Foam

80 kg/m³ EPDM foam provides a balance between softness and structural support.

Advantages:

• Good flexibility

• Improved durability compared with lower density foam

• Stable sealing performance

• Suitable for long-term applications

Typical applications:

• Automotive sealing

• Anti-rattle solutions

• Equipment protection

• Industrial gaskets

80 kg/m³ is often selected when customers need both comfort and reliable compression performance. Aito Foam

90 kg/m³ Open Cell EPDM Foam

90 kg/m³ EPDM foam is one of the most commonly used densities for industrial applications.

It offers:

• Balanced compression resistance

• Good sealing performance

• Excellent durability

• Reliable long-term performance

Typical applications:

• Automotive NVH applications

• Industrial sealing

• Machinery protection

• Construction sealing

For many customers, 90 kg/m³ is considered a good middle option between flexibility and strength. Aito Foam

120 kg/m³ Open Cell EPDM Foam

120 kg/m³ EPDM foam provides a firmer structure and higher material support.

Advantages:

• Higher density structure

• Better load support

• Improved resistance to repeated compression

Typical applications:

• Heavy-duty sealing

• Industrial equipment

• Higher compression requirement applications

When the foam needs stronger support while maintaining EPDM's weather resistance and flexibility, 120 kg/m³ can be a suitable choice. Aito Foam

Comparison of Open Cell EPDM Foam Densities

How to Select the Right EPDM Foam Density?

Before selecting EPDM foam density, consider:

1. Compression Requirement

How much force is available to compress the foam?

Soft applications usually require lower density foam.

Applications requiring stronger support may need higher density foam.

2. Gap Size

Large gaps often require softer foam because it needs to compress and fill irregular spaces.

Small precision gaps may require a more controlled compression response.

3. Environment

Consider:

• Temperature range

• UV exposure

• Ozone exposure

• Outdoor usage

• Chemical contact

EPDM foam is widely used because of its excellent weather resistance and aging performance.

4. Processing Requirements

The final product may require:

• Foam sheets

• Foam strips

• Adhesive backing

• Die cutting

• Custom shapes

AITO Foam can provide customized EPDM foam solutions according to customer drawings and application requirements.

Customized Open Cell EPDM Foam Solutions

AITO Foam supplies open cell EPDM foam with different densities, thicknesses, and processing options.

Available solutions include:

• EPDM foam sheets

• EPDM foam rolls

• Adhesive backed EPDM foam

• Die-cut EPDM foam parts

• Custom dimensions

Our EPDM foam products are used in automotive, construction, electronics, industrial sealing, and vibration control applications.

Choosing the correct density is the first step to achieving reliable sealing and long-term performance.

Contact AITO Foam for professional EPDM foam selection support.

FAQ

Is higher density EPDM foam always better?

No. The best density depends on the application. Higher density provides more support, but softer foam may perform better for gap filling and cushioning.

What is the most commonly used EPDM foam density?

90 kg/m³ is widely selected for many industrial sealing and automotive applications because it provides a good balance between flexibility and support.

Can EPDM foam density be customized?

Yes. Different densities, thicknesses, sizes, adhesive backing, and die-cut shapes can be customized according to application requirements.