2# Polyether Polyurethane Foam
H-O Products 2# Polyether Polyurethane Foam is an open cell, medium/low density polyether polyurethane foam with a density of 2 lb/ft³ ±10% and an indentation force deflection of 35 lb/50 in² average at 25% deflection per ASTM D3574. The material passes FMVSS-302, UL 94 HF-1 (at 0.1″ minimum thickness), California Technical Bulletin 117 Section A Part 1, REACH, and RoHS. It is very conformable and suited to sound, light and dust sealing, noise and air infiltration prevention, foam wrap window installation, and cushioning and vibration damping applications.
Key Properties
- Indentation Force Deflection Average (25% Deflection): 35 lb/50 in² (ASTM D3574)
- Tensile Strength (Average): 20 psi (ASTM D3574)
- Elongation (Average): 200% (ASTM D3574)
- Density: 2 lb/ft³ ±10% (ASTM D3574)
- UL 94 HF-1: Pass (at 0.1″ minimum thickness)
- FMVSS-302: Pass
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- Specifications
- Applications
- General Info
- FAQs
Physical Properties
| Property | Value | Test Method |
| Thickness | 1/8″, 3/16″, 1/4″, 3/8″, 1/2″, 3/4″, 1″ | — |
| Color | Gray | — |
| Material/Substrate | Polyether Polyurethane Foam | — |
| Cell Structure | Open Cell | — |
| Density | 2 lb/ft³ ±10% | ASTM D3574 |
Mechanical Properties
| Property | Value | Test Method |
| Indentation Force Deflection Average (25% Deflection) | 35 lb/50 in² | ASTM D3574 |
| Indentation Force Deflection Average (65% Deflection) | 70 lb/50 in² | ASTM D3574 |
| Indentation Force Deflection Minimum (25% Deflection) | 26 lb/50 in² | ASTM D3574 |
| Indentation Force Deflection Minimum (65% Deflection) | 50 lb/50 in² | ASTM D3574 |
| Tensile Strength (Minimum) | 15 psi | ASTM D3574 |
| Tensile Strength (Average) | 20 psi | ASTM D3574 |
| Elongation (Minimum) | 150% | ASTM D3574 |
| Elongation (Average) | 200% | ASTM D3574 |
| Tear Strength (Average) | 2.50 lb/in | ASTM D3574 |
| Tear Strength (Minimum) | 1.50 lb/in | ASTM D3574 |
Flame & Fire Performance
| Property | Value | Test Method |
| Flame Retardant | Flame retardant by special request | — |
| FMVSS-302 | Pass | — |
| UL 94 HF-1 | Pass | — |
| California Technical Bulletin 117, Section A, Part 1 | Pass | — |
Regulatory / Compliance Data
| Property | Value | Test Method |
| REACH | Pass | — |
| RoHS | Pass | — |
Aging Performance
Dry Heat Aging
| Property | Value | Test Method |
| Retention of Tensile Strength After 22 Hours, 140°C, Dry Heat Aging | Min. 70% | ASTM D3574 |
Steam Autoclave
| Property | Value | Test Method |
| Retention of Tensile Strength After 5 Hours @ 120°C, Steam Autoclave | Min. 70% | ASTM D3574 |
Compliance
- FMVSS-302 — Compliant
- UL 94 HF-1 — Compliant (at 0.1″ minimum thickness)
- California Technical Bulletin 117, Section A, Part 1 — Compliant
- REACH — Compliant
- RoHS — Compliant
- Sound, light, and dust seals in doors, windows, and enclosures requiring a very conformable open cell polyether foam
- Noise and air infiltration prevention around doors and windows in residential and commercial construction
- Foam wrap window installation where the foam sets the window snugly into the house frame while providing insulation
- Insulation, cushioning, and vibration damping in construction, HVAC, and consumer product assemblies
- Automotive interior and furniture applications requiring FMVSS-302, UL 94 HF-1, and California TB 117 Section A Part 1 compliance
Common industries: construction, fenestration, automotive, furniture, HVAC, consumer goods.
The 2# Polyether Polyurethane Foam is a medium/low density grade in H-O Products’ polyether polyurethane foam series, at 2 lb/ft³ ±10%. It is an open cell foam designed for sound, light, and dust sealing; prevention of noise and air infiltration through and around doors and windows; foam wrap window installation that sets the window snugly into the house frame while insulating; and general insulating, cushioning, and vibration damping applications. The material is very conformable, supporting reliable sealing against irregular surfaces.
Tensile strength is 15 psi minimum and 20 psi average per ASTM D3574. Elongation is 150% minimum and 200% average. IFD averages are 35 lb/50 in² at 25% deflection and 70 lb/50 in² at 65% deflection. Tear strength is 1.50 lb/in minimum and 2.50 lb/in average. Retention of tensile strength is a minimum of 70% after 22 hours at 140°C dry heat aging and after 5 hours at 120°C steam autoclave, both per ASTM D3574.
The material passes FMVSS-302, UL 94 HF-1 (at 0.1″ minimum thickness), California Technical Bulletin 117 Section A Part 1, REACH, and RoHS. A flame retardant formulation is available by special request.
Compliant with FMVSS-302, UL 94 HF-1 (at 0.1″ minimum thickness), California Technical Bulletin 117 Section A Part 1, REACH, and RoHS.
What differentiates the 2# Polyether Polyurethane Foam from the lower-density 1.2# and higher-density 4# grades?
The 2# is a medium/low density grade at 2 lb/ft³ and carries the broadest compliance profile in the polyether polyurethane series — FMVSS-302, UL 94 HF-1 (at 0.1" minimum thickness), California Technical Bulletin 117 Section A Part 1, REACH, and RoHS. It is the only grade in the series to list California TB 117. The 4# provides a higher IFD (65 lb/50 in² average at 25%) for applications requiring firmer compression resistance, while the 1.2# provides the softest response.
Why does indentation force deflection matter for open cell polyurethane foam selection?
Indentation force deflection (IFD) measures the load required to indent a foam sample by a defined percentage of its thickness, providing a practical measure of the foam's firmness and its resistance to surface loading. For sealing, cushioning, and insulation applications, selecting the appropriate IFD ensures the foam compresses adequately under service loads while maintaining sufficient structure to hold its position. The 2# grade's average IFD of 35 lb/50 in² at 25% positions it as a soft, conformable grade suitable for light clamping and sealing loads.
What is the service temperature range for the 2# Polyether Polyurethane Foam?
A specific service temperature range is not stated on the manufacturer's TDS for this material. Aging performance data includes retention of tensile strength after 22 hours at 140°C dry heat aging and after 5 hours at 120°C steam autoclave, both with a minimum retention of 70%.
Is the 2# Polyether Polyurethane Foam suitable for regulated environments?
Yes. The material passes FMVSS-302, UL 94 HF-1 (at 0.1" minimum thickness), California Technical Bulletin 117 Section A Part 1, REACH, and RoHS, as stated on the TDS. A flame retardant formulation is also available by special request.
How should the 2# Polyether Polyurethane Foam be specified?
Specify grade (2# Polyether Polyurethane Foam), thickness, compliance requirements (FMVSS-302, UL 94 HF-1 minimum thickness if applicable, California TB 117, REACH, RoHS as applicable), dimensional tolerances, and finished format.
