MATERIALS, ADHESIVES AND COATINGS
SIF® Felt and Custom Felt felted (thermally compressed) polyurethane foam for filters, wicks and sound absorption
Country: USA · Model: SIF Felt / Custom Felt
Felted polyurethane foam, permanently compressed under heat, pressure and time, for filters, oil wicks and sound absorption. The compression degree, firmness, goes up to 20, and the minimum thickness is 0.025 inch (about 0.64 mm). By changing the compression, the required permeability, density and strength are set.
- Material
- permanently compressed flexible polyurethane foam; SIF® Felt — from reticulated foam (polyester or polyether), Custom Felt — from non-reticulated
- Base grade
- Grade 900 — from 90 ppi reticulated foam with 97 % free volume before compression
- Compression degree (firmness)
- up to 20 (typically 3–10+); grades 4, 6, 8, 10, 12
- Minimum thickness
- 0.025 inch (≈0.64 mm)
Technical specifications
| Material | permanently compressed flexible polyurethane foam; SIF® Felt — from reticulated foam (polyester or polyether), Custom Felt — from non-reticulated |
|---|---|
| Base grade | Grade 900 — from 90 ppi reticulated foam with 97 % free volume before compression |
| Compression degree (firmness) | up to 20 (typically 3–10+); grades 4, 6, 8, 10, 12 |
| Minimum thickness | 0.025 inch (≈0.64 mm) |
| Density (900Z, polyester) | 7.5–22.5 pcf (≈120–360 kg/m³) for firmness 4–12 |
| Free volume | 89–68 % (900Z, firmness 4–12) |
| Tensile strength | 110–330 psi (900Z), 105–280 psi (900C), 75–150 psi (700ZE, polyether) |
| Elongation | 245–450 % |
| Compressive stress 25 % / 65 % | 2–47 / 16–78 psi (900Z) |
| Compression set 50 % | 12–22 % |
| Frazier air permeability | 78–6 cfm/ft² (900Z, firmness 4–12); 113 and 33 cfm/ft² (4- and 8-700ZE) |
| Oil absorption | 0.41–0.68 g/cm³ (47–78 % of volume) depending on firmness |
| Properties | high strength, resistance to abrasion and solvents, capillary oil rise |
Specifications are taken from the manufacturer’s technical documentation. Updated .
Description
The starting block is heated and compressed with heated plates, fixing the new thickness and density. The ratio of the starting thickness to the final one is called firmness, so SIF® Felt with firmness 4 has a compression ratio of 4:1. SIF® Felt is made from fully reticulated foam, the standard grade Grade 900 is formed from 90 ppi foam with a free volume of 97 % before compression, and Custom Felt from ordinary non-reticulated foam. In polyester SIF® Felt 900Z, at firmness from 4 to 12, density grows from 7.5 to 22.5 pcf (≈120–360 kg/m³), free volume decreases from 89 to 68 %, tensile strength increases from 110 to 330 psi, and Frazier air permeability falls from 78 to 6 cfm/ft². Compressive stress at 25 % deformation is 2–47 psi, at 65 % 16–78 psi, and compression set after 50 % compression is 12–18 %. Custom Felt 900C has a similar density and a strength of 105–280 psi, and the 700ZE grades on polyether have densities of 7 and 13.5 pcf and strengths of 75 and 150 psi.
How to choose
Firmness is selected for the task, since the finer the particles to be arrested, the higher the firmness and the greater the resistance to flow. For oil wicks and lubricant reservoirs the foam absorbs 0.41–0.68 g/cm³ of oil, that is 47–78 % of the volume, with a maximum at around firmness 8. The values given are typical for 1/4 inch material and are not a specification, so the properties of a specific grade are agreed with the customer.
Request a price and lead time
SIF® Felt and Custom Felt felted (thermally compressed) polyurethane foam for filters, wicks and sound absorption. We reply within one business day.
Or email office@usk.ua or call +38 (044) 339-50-20.
FAQ
What is firmness in felted foam?
It is the ratio of the starting thickness to the final one. SIF® Felt with firmness 4 has a compression ratio of 4:1, and available values go up to 20.
What are the density and strength of SIF Felt 900Z?
At firmness from 4 to 12 density grows from 7.5 to 22.5 pcf, and tensile strength from 110 to 330 psi.
What is the air permeability of felted foam?
For the 900Z by Frazier it falls from 78 to 6 cfm/ft², and for the 700ZE grade it is 113 and 33 cfm/ft² for firmness 4 and 8.
How much oil does felted foam absorb?
0.41–0.68 g/cm³, or 47–78 % of the volume, depending on firmness. The capillary rise height grows with firmness and holding time.
Where are SIF Felt and Custom Felt used?
For sound absorbers and vibration damping supports in office equipment, electronics and transport, air and liquid filters, oil wicks, gaskets, pressure pads and ink feed in inkjet printers.
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