Ethafoam® 400 is the heaviest-duty foam of the standard grades (although considerably less dense than Ethafoam® 700/900), at 57 kg/m³ (4.0 pcf).
Manufactured by Sealed Air, Ethafoam® 400 is a closed-cell polyethylene foam well suited to protective packaging and structural industrial cushioning/dunnage. It provides better load-bearing and compressive strength compared to low- and mid-density grades, increased resistance to crushing and deformation under weight and extreme mechanical stress, yet still offers a lighter alternative to wood or rubber blocks. Ethafoam® 400 is popular for applications such as protecting automotive tooling and heavy industrial components.
Regardless of the density, type, size or properties of the foam your business requires, Polyformes can help. Our material stockholding, in-house conversion equipment, and expert staff ensure you get the best material for your application at the best price.
The data presented for Ethafoam® 400 relates to the unfabricated polyethene foam product. While values shown are typical of this product, they should not be construed as specification limits. These are given to the best of our knowledge and should be considered as guidance for selecting a suitable grade for a given application. Please contact our foam experts for further advice if required.
A summary of key information for Ethafoam® 400 foam material is as follows:
| Property | Test Standard | Typical Value |
|---|---|---|
| Density | ASTM D3575-08 ISO 845:2006 | 57 kg/m³ |
| Compressive Strength (vertical @ 25%) | ASTM D3575-08 Suffix D ISO 7214:2007 | 120 kPa |
| Compressive Strength (vertical @ 50%) | ASTM D3575-08 Suffix D ISO 7214:2007 | 190 kPa |
| Compressive Set (50%) | ASTM D3575-08 Suffix B ISO 1856:2000 | < 20 |
| Compressive Creep (%) (1000 hrs) | ASTM D3575-08 Suffix BB | < 10 @ 35 kg/dm2 |
| Tensile Strength (@ peak (MD/CD)) | ASTM D3575-08 Suffix T ISO 1798: 2008 | 203 / 296 kPa |
| Tear Strength (MD/CD) | ASTM D3575-08 Suffix G | 26 / 17 |
| Water Absorption | ASTM D3575-08 | < 1 % |
| Thermal Stability | ASTM D3575-08 Suffix S | < 2 % |
| Static Decay* (Anti-Static Grade) | EIA Std. 541 Append. F | < 2 sec |
| Surface Resistivity* (ohms ⁄ sq) (Anti-Static Grade) | EIA Std. 541 Section 4.3 | 1.0 × 10⁹ – 1.0 × 10¹² |
*Please see datasheet for full details.
Download the datasheet (PDF format) for full technical details.
Please note that due to individual display settings, the colours you see on your screen may vary slightly from the actual material colour.
*Yellowing: While Ethafoam® is very stable, prolonged exposure to high heat or UV light during storage may cause minor discolouration.
Black
White
Polyformes can split/skive, laminate and butt-weld Ethafoam® planks to the specific dimensions you require. MOQs may apply to certain size/material options.
Please get in touch with a member of our team to discuss your requirements.
Ethafoam® 400 foam is suitable for conversion using the following processes:
Ethafoam® 400, whilst primarily used for protective packaging, may also be suitable for the following applications. Please note, however, that this list is not exhaustive – if you cannot see your intended application, please get in touch to discuss your options with our foam experts.
By sourcing your foam material from Polyformes, you can expect several benefits.
Advice and knowledge
Official Sealed Air suppliers
Widest range of options
Fabricated foam products
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