1.3# Polyurethane Hybrid Foam (“Ester-Like” Ether)
H-O Products 1.3# Polyurethane Hybrid Foam is an open cell, low density “ester-like ether” polyurethane foam with a density of 1.3 lb/ft³ ±10% and a compression force deflection of 0.85 psi average at 25% per ASTM D3574. The material is described as very conformable and is REACH and RoHS compliant. It is suited to dust and insect filtration, conformable weatherstripping, acoustic insulation, window screen tape sealing, and access door sealing applications requiring high compression and recovery.
Key Properties
- Compression Force Deflection @ 25%, Average: 0.85 psi (ASTM D3574)
- Tensile Strength (Average): 23 psi (ASTM D3574)
- Elongation (Average): 120% (ASTM D3574)
- Density: 1.3 lb/ft³ ±10% (ASTM D3574)
- Indentation Force Deflection Average (25% Deflection): 72 lb/50 in² (ASTM D3574)
- REACH / RoHS: Yes / Yes
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- Specifications
- Applications
- General Info
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Physical Properties
| Property | Value | Test Method |
| Thickness | 1/8″, 3/16″, 1/4″, 3/8″, 1/2″, 3/4″, 1″ | — |
| Color | Gray | — |
| Material/Substrate | Polyurethane Hybrid Foam (“Ester-like” Ether) | — |
| Cell Structure | Open Cell | — |
| Density | 1.3 lb/ft³ ±10% | ASTM D3574 |
Mechanical Properties
| Property | Value | Test Method |
| Compression Force Deflection @ 25%, Average | 0.85 psi | ASTM D3574 |
| Compression Force Deflection @ 25%, Minimum | 0.7 psi | ASTM D3574 |
| Compression Force Deflection @ 50%, Average | 1.1 psi | ASTM D3574 |
| Compression Force Deflection @ 50%, Minimum | 0.75 psi | ASTM D3574 |
| Indentation Force Deflection Average (25% Deflection) | 72 lb/50 in² | ASTM D3574 |
| Indentation Force Deflection Average (65% Deflection) | 165 lb/50 in² | ASTM D3574 |
| Indentation Force Deflection Minimum (25% Deflection) | 60 lb/50 in² | ASTM D3574 |
| Indentation Force Deflection Minimum (65% Deflection) | 110 lb/50 in² | ASTM D3574 |
| Tensile Strength (Minimum) | 17 psi | ASTM D3574 |
| Tensile Strength (Average) | 23 psi | ASTM D3574 |
| Elongation (Minimum) | 90% | ASTM D3574 |
| Elongation (Average) | 120% | ASTM D3574 |
| Tear Strength (Average) | 2.1 lb/in | ASTM D3574 |
| Tear Strength (Minimum) | 1.3 lb/in | ASTM D3574 |
Regulatory / Compliance Data
| Property | Value | Test Method |
| REACH | Yes | — |
| RoHS | Yes | — |
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 D3574-86 |
Compliance
- REACH — Compliant
- RoHS — Compliant
- Dust and insect filter pads in HVAC, window, and equipment enclosure assemblies where a very conformable, low-density open cell foam with high compression recovery is required
- Conformable weatherstripping for doors, windows, and access panels requiring a foam that compresses readily and recovers fully to maintain a consistent seal
- Window screen tape seals securing half screens to the meeting rail in window assemblies, preventing entry of insects and debris
- Acoustic insulation components in building, automotive, and enclosure applications requiring a soft, conformable foam that conforms to irregular surfaces
- Access door seals and gaskets requiring a foam with high compression and recovery capability across the available thickness range
Common industries: construction, fenestration, HVAC, acoustics, consumer goods, electronics.
The 1.3# Polyurethane Hybrid Foam is an open cell, low density foam based on a proprietary “ester-like ether” polyurethane hybrid chemistry. At 1.3 lb/ft³ ±10%, it is designed for applications requiring high compression and recovery — including dust and insect filters, conformable weatherstripping, acoustic insulation, window screen tape seals that secure half screens to the meeting rail in window assemblies, and sealing access doors.
Despite its low density, it delivers an indentation force deflection of 72 lb/50 in² average at 25% deflection and 165 lb/50 in² average at 65% deflection, reflecting the firmer compression response characteristic of its ester-like hybrid chemistry compared to standard low-density polyether foams.
Tensile strength is 17 psi minimum and 23 psi average per ASTM D3574. Elongation is 90% minimum and 120% average. Compression force deflection is 0.85 psi average and 0.7 psi minimum at 25%, and 1.1 psi average and 0.75 psi minimum at 50%. Tear strength is 1.3 lb/in minimum and 2.1 lb/in average. Retention of tensile strength is a minimum of 70% after 22 hours at 140°C dry heat aging per ASTM D3574, and a minimum of 70% after 5 hours at 120°C steam autoclave per ASTM D3574-86. The material is REACH and RoHS compliant.
Compliant with REACH and RoHS.
What differentiates the 1.3# Polyurethane Hybrid Foam from standard polyether polyurethane foam grades?
The 1.3# Polyurethane Hybrid Foam uses a proprietary "ester-like ether" hybrid chemistry — distinct from both standard polyether and polyester polyurethane formulations. Despite its low density of 1.3 lb/ft³, it delivers an IFD of 72 lb/50 in² average at 25% deflection — higher than the 2# polyether grade's 35 lb/50 in² and approaching the 4# polyether grade's 65 lb/50 in² at the same deflection level, but at roughly half the density. This combination of very low density and firm compression response is the defining characteristic of the hybrid chemistry and makes it suited to applications requiring high compression and recovery, such as dust and insect filtration and window screen sealing.
Why does compression force deflection matter for this hybrid foam?
Compression force deflection defines the load required to compress the foam to a given deflection level, determining how much resistance the foam provides in a seal or filter application. The 1.3# hybrid foam has a CFD of 0.85 psi average at 25% and 1.1 psi average at 50%, reflecting a moderate, progressive resistance that allows the foam to compress and conform under service loads while recovering fully when the load is removed — a critical requirement for weatherstripping, screen tape, and filter applications where repeated compression-recovery cycles are expected.
What is the service temperature range for the 1.3# Polyurethane Hybrid 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 per ASTM D3574 and after 5 hours at 120°C steam autoclave per ASTM D3574-86, both with a minimum retention of 70%.
Is the 1.3# Polyurethane Hybrid Foam suitable for regulated environments?
The material is REACH and RoHS compliant, as stated on the TDS. No flame ratings, FMVSS standards, or other regulatory compliance standards are listed on the TDS.
How should the 1.3# Polyurethane Hybrid Foam be specified?
Specify grade (1.3# Polyurethane Hybrid Foam ("Ester-Like" Ether)), thickness, compliance requirements (REACH, RoHS if applicable), dimensional tolerances, and finished format.
