20 PPI Uncoated Reticulated Foam
20 PPI Uncoated Reticulated Foam is a compressible open cell polyether polyurethane foam with a nominal cell count of 20 ppi ±5 (CREST), a density of 1.4 lb/ft³ ±0.10, and a volumetric air flow rate of 22 cfm ±3.5 per ASTM D3574-91. It is designed to weep moisture while minimizing the infiltration of drafts, water, dust, and insects into buildings and cavities, and is used inside extrusions and cavities where it is not exposed to UV or sunlight. It is the mid-pore grade in the uncoated reticulated foam series.
Key Properties
- Compression Force Deflection @ 25%: 0.50 psi ±0.10 (ASTM D3574-91)
- Compression Set @ 50% Deflection: 15% loss maximum (ASTM D3574-91)
- Tensile Strength: 18 lb/in minimum (ASTM D3574-91)
- Elongation @ Break: 180% minimum (ASTM D3574-91)
- Density: 1.4 lb/ft³ ±0.10 (ASTM D3574-91)
- Volumetric Air Flow Rate: 22 cfm ±3.5 (ASTM D3574-91)
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- Specifications
- Applications
- General Info
- FAQs
Physical Properties
| Property | Value | Test Method |
| Thickness | 1/4″, 3/8″, 5/8″, 1/2″, 3/4″, 7/8″, 1″, 1-1/8″, 1-1/4″, 1-3/8″, 1-1/2″, 1-3/4″, 2″ | — |
| Material/Substrate | Polyether Polyurethane Foam | — |
| Color | Charcoal Gray | — |
| Cell Structure | Open Cell | — |
| Cell Count | 20 ppi ±5 | CREST |
| Foam Grade | T-20 | CREST |
| Density | 1.4 lb/ft³ ±0.10 | ASTM D3574-91 |
Mechanical Properties
| Property | Value | Test Method |
| Compression Force Deflection @ 25% | 0.50 psi ±0.10 | ASTM D3574-91 |
| Compression Set @ 50% Deflection | 15% loss maximum | ASTM D3574-91 |
| Tensile Strength | 18 lb/in minimum | ASTM D3574-91 |
| Elongation @ Break | 180% minimum | ASTM D3574-91 |
| Tear Strength | 5 lb/in minimum | ASTM D3574-91 |
Acoustic / Air Flow
| Property | Value | Test Method |
| Volumetric Air Flow Rate | 22 cfm ±3.5 | ASTM D3574-91 |
| Air Pressure Drop | 0.15 ±0.05 | ASTM D3574-91 |
Flame & Fire Performance
| Property | Value | Test Method |
| Flame Retardant | Flame retardant available by special request | — |
Aging Performance
Dry Heat Aging
| Property | Value | Test Method |
| Tensile Strength Dry Heat Loss | 15% maximum | ASTM D3574-91 |
Autoclave Aging
| Property | Value | Test Method |
| Compression Set @ 50% Deflection Autoclave Loss | 10% maximum | ASTM 3574-91 |
| 25% Compression Load Deflection Autoclave Loss | 15% maximum | ASTM D3574-91 |
- Weep baffling in commercial and residential construction requiring a mid-pore reticulated foam that balances moisture weeping with filtration of insects, dust, and drafts
- General filtering applications inside extrusions and cavities not exposed to UV or sunlight where medium-pore filtration is required
- NEMA enclosure and generator or compressor housing ventilation where moderate air flow with controlled particle filtration is specified
- Moisture infiltration barriers in building envelope assemblies requiring a compressible open cell foam that seals the perimeter under installation compression while passing moisture
- Draft and air infiltration seals in doors, windows, and access panels where the mid-pore grade is specified for balanced filtration performance
Common industries: construction, fenestration, HVAC, electrical enclosures, industrial equipment.
The 20 PPI Uncoated Reticulated Foam is a mid-pore grade in H-O Products’ uncoated reticulated foam series, with a nominal cell count of 20 ppi and a volumetric air flow rate of 22 cfm ±3.5. It is a compressible polyether polyurethane foam designed for general filtering applications, weep baffling in commercial and residential construction, and use inside extrusions and cavities not exposed to UV or sunlight.
Its open skeletal structure allows moisture and condensation to weep from the building while minimizing the infiltration of drafts, moisture, insects, and dust.
Per the TDS note, the Crest visual PPI standard is the industry accepted nomenclature for defining reticulated foam pore size; however, the air flow is the only quantifiable value for determining PPI for published specifications, and the only exception allowed is if visual PPI is agreed as a standard in advance prior to order submission.
Density is 1.4 lb/ft³ ±0.10. Compression force deflection at 25% is 0.50 psi ±0.10. Compression set at 50% deflection is 15% loss maximum, with the tightest autoclave compression set loss in the series at 10% maximum. Tensile strength is 18 lb/in minimum with a dry heat loss maximum of 15%. Elongation at break is 180% minimum. Tear strength is 5 lb/in minimum. Air pressure drop is 0.15 ±0.05 per ASTM D3574-91. The 25% compression load deflection autoclave loss is 15% maximum. Flame retardant is available by special request.
No compliance standards are specified on the manufacturer’s TDS for this material.
What differentiates the 20 PPI Uncoated grade from the 10 PPI and higher-ppi uncoated grades?
The 20 PPI grade occupies a mid-pore position in the uncoated series, with a volumetric air flow rate of 22 cfm ±3.5 — between the 10 PPI grade's 25.5 cfm ±4.5 and the 30 PPI grade's 18 cfm ±2. It carries the tightest autoclave compression set loss specification at 10% maximum. Its tensile strength of 18 lb/in minimum is substantially higher than the 10 PPI grade (5 lb/in), offering a balance of mechanical integrity and air flow performance.
Why is compression force deflection important for an uncoated reticulated foam used in weep baffling and filtration?
Compression force deflection determines how readily the foam compresses to fill a cavity or extrusion under installation force. The 20 PPI grade has a CFD of 0.50 psi ±0.10 at 25%, providing moderate resistance that allows the foam to compress reliably into its installation cavity while maintaining the structural integrity needed to hold its position and maintain consistent air flow and filtration performance in service.
What is the service temperature range for the 20 PPI Uncoated Reticulated Foam?
A specific service temperature range is not stated on the manufacturer's TDS for this material. Aging performance data includes tensile strength dry heat loss of 15% maximum per ASTM D3574-91 and autoclave aging performance per ASTM 3574-91 and ASTM D3574-91.
Is the 20 PPI Uncoated Reticulated Foam suitable for regulated environments?
No compliance standards are specified on the manufacturer's TDS for this material. A flame retardant formulation is available by special request. The standard uncoated grade is for use in applications not exposed to UV or sunlight, as stated on the TDS.
How should the 20 PPI Uncoated Reticulated Foam be specified?
Specify grade (20 PPI Uncoated Reticulated Foam, Foam Grade T-20), thickness, color (Charcoal Gray), compliance requirements if applicable, dimensional tolerances, and finished format. Per the TDS, air flow is the only quantifiable value for determining PPI for published specifications.
