MATERIALS, ADHESIVES AND COATINGS
Aresto™ flame-retardant sound and thermal insulation polyester foam, UL 94 HF-1 / FMVSS 302
Country: USA · Model: Aresto 2# / 4#
Flame-retardant polyester foam in two grades, Aresto 2# and 4#, with densities of 2.0 and 4.0 lb/ft³ (≈32 and 64 kg/m³). Complies with UL 94 HF-1 and FMVSS-302, pore size 70 ppi. It is placed in engine enclosures, household appliances, class 8 truck cabs and generator set housings.
- Material
- flexible polyester-based polyurethane foam with a flame retardant
- Grades
- Aresto 2# and Aresto 4#
- Density
- 2.0 / 4.0 lb/ft³ (≈32 / 64 kg/m³)
- Pore size
- 70 ppi (not per the ASTM method)
Technical specifications
| Material | flexible polyester-based polyurethane foam with a flame retardant |
|---|---|
| Grades | Aresto 2# and Aresto 4# |
| Density | 2.0 / 4.0 lb/ft³ (≈32 / 64 kg/m³) |
| Pore size | 70 ppi (not per the ASTM method) |
| Air permeability | 70 ft³/min/ft² |
| Tensile strength | 20 / 23 psi |
| Tear resistance | 2.5 / 3.4 lb/in |
| Elongation | 190 / 330 % |
| Compression set 50 % | 10 / 5 % |
| NRC / SAA | 0.45 / 0.50 (2#); 0.55 / 0.56 (4#) |
| Thermal resistance R | 0.561 / 0.520 m²·K/W |
| Thermal conductivity | 0.04528 / 0.04887 W/(m·K) |
| Fire safety | UL 94 HF-1; FMVSS-302 |
| Test method | ASTM D3574 |
Specifications are taken from the manufacturer’s technical documentation. Updated .
Description
The material sits in the acoustic line next to Hyfonic™ and AEROFONIC®. Low-density grades work as sound absorbers, denser ones serve as a damping layer. Grade 2# has a tensile strength of 20 psi, tear resistance of 2.5 lb/in, elongation of 190 % and compression set after 50 % compression of 10 %, while for 4# these are 23 psi, 3.4 lb/in, 330 % and 5 %. Air permeability of both grades is 70 ft³/min/ft², and the foam is well suited to die-cutting. Sound absorption is given by NRC 0.45 and SAA 0.50 for 2# and NRC 0.55 and SAA 0.56 for 4#. Thermal resistance is 0.561 and 0.520 m²·K/W, thermal conductivity 0.04528 and 0.04887 W/(m·K) respectively, and all physical parameters are measured per ASTM D3574. The foam laminates well with films, fabrics and adhesive layers.
How to choose
The choice comes down to density. For an enclosure or hood where noise simply needs to be absorbed, 2# is enough. If the layer must also dampen and hold its shape, take 4# with NRC 0.55 and elongation of 330 %. When the conditions require FAR 25.853 approval, look at Hyfonic™ (1.7 lb/ft³, 65 ppi) or AEROFONIC® (5.4 lb/ft³, 70 ppi).
Request a price and lead time
Aresto™ flame-retardant sound and thermal insulation polyester foam, UL 94 HF-1 / FMVSS 302. We reply within one business day.
Or email office@usk.ua or call +38 (044) 339-50-20.
FAQ
What is the density of the Aresto 2# and 4# grades?
Grade 2# has 2.0 lb/ft³ (≈32 kg/m³), grade 4# has 4.0 lb/ft³ (≈64 kg/m³). Pore size of both is 70 ppi.
What flammability is declared for this foam?
The material complies with class UL 94 HF-1 and the automotive standard FMVSS-302, so it is used where sound insulation must be flame-retardant.
Is the foam suitable for a diesel generator enclosure?
Yes, it is used for enclosures of engines, industrial machines and generator sets. For strong noise take 4# with NRC 0.55 and SAA 0.56.
What is the thermal conductivity of Aresto foam?
0.04528 W/(m·K) for grade 2# and 0.04887 W/(m·K) for grade 4#. Thermal resistance is 0.561 and 0.520 m²·K/W respectively.
Can a film or fabric be applied to the foam?
Yes, the manufacturer states good laminating ability with films, fabrics and adhesive layers. The foam parameters are measured per ASTM D3574.
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