45 PPI PVC Coated Reticulated Foam UL94 HF-1
H-O Products 45 PPI PVC Coated Reticulated Foam UL94 HF-1 is a PVC-coated open cell polyether polyurethane foam with a nominal 45 pores per inch (PPI) cell count, a volumetric air flow rate of 12.5 cfm ±2, and a density of 1.4 lb/ft³ ±0.10. The flexible polyether substrate is coated with an aqueous dispersion of a PVC copolymer, providing UV resistance rated as Excellent after 252 hours per ASTM G154 and a UL94 HF-1 flame rating. The material weeps moisture while minimizing infiltration of drafts, water, dust, and insects into buildings and enclosed cavities.
Key Properties
- Compression Force Deflection @ 25%: 0.65 psi ±0.10 | ASTM D3574-91
- Tensile Strength: 22 lb/in minimum | ASTM D3574-91
- Elongation @ Break: 200% minimum | ASTM D3574-91
- Compression Set @ 50% Deflection: 25% loss maximum | ASTM D3574-91
- Density: 1.4 lb/ft³ ±0.10 | ASTM D3574-91
- UV Resistance, 252 Hours: Excellent | ASTM G154
We want to help!
Enter your information and we'll get you in touch with our knowledgable staff. We know how important to the right product for your project.
Request a Consultation
- Specifications
- Applications
- General Info
- FAQs
Physical Properties
| Property | Value | Test Method |
| Material/Substrate | Polyether Polyurethane Foam | — |
| Color | Black | — |
| Cell Structure | Open Cell | — |
| Cell Count | 45 ppi ±5 | CREST |
| Foam Grade | S-45 | CREST |
| Density | 1.4 lb/ft³ ±0.10 | ASTM D3574-91 |
| Volumetric Air Flow Rate | 12.5 cfm ±2 | ASTM D3574-91 |
| Air Pressure Drop | 0.15 ±0.05 | ASTM D3574-91 |
Mechanical Properties
| Property | Value | Test Method |
| Compression Force Deflection @ 25% | 0.65 psi ±0.10 | ASTM D3574-91 |
| Tensile Strength | 22 lb/in minimum | ASTM D3574-91 |
| Tensile Strength Dry Heat Loss | 20% maximum | ASTM D3574-91 |
| Elongation @ Break | 200% minimum | ASTM D3574-91 |
| Tear Strength | 4.5 lb/in minimum | ASTM D3574-91 |
| Compression Set @ 50% Deflection | 25% loss maximum | ASTM D3574-91 |
| Compression Set @ 50% Deflection Autoclave Loss | 25% maximum | ASTM 3574-91 |
| 25% Compression Load Deflection Autoclave Loss | 15% maximum | ASTM D3574-91 |
Flame & Fire Performance
| Property | Value | Test Method |
| UL94 HF-1 | Rated | — |
Environmental Performance
| Property | Value | Test Method |
| UV Resistance, 252 Hours | Excellent | ASTM G154 |
Compliance
- UL94 HF-1 — Rated
- Fine-filtration media for air conditioner filters and loudspeaker covers where higher PPI is required
- Weep baffling in commercial and residential construction requiring finer particulate exclusion
- Automotive and aircraft cabin filtration and environmental sealing components
- HVAC and appliance filter inserts in enclosed cavities requiring UV-resistant, flame-rated material
- Electronics enclosure seals and vents in industrial or outdoor environments
Common industries: Construction, HVAC, Automotive, Aerospace, Electronics, Appliance
The 45 PPI PVC Coated Reticulated Foam UL94 HF-1 is a fine-grade, PVC-coated reticulated polyether polyurethane foam positioned toward the upper end of the PVC-coated reticulated foam series. At 45 PPI, it offers finer filtration and greater particulate retention than the 20 PPI and 30 PPI grades, making it suitable for loudspeaker covers, air conditioner filters, and general filtration in commercial and residential construction, as well as automotive, aircraft, HVAC, appliance, and electronics applications.
The aqueous PVC copolymer coating provides UV resistance and durability widely specified by architects for exterior and semi-exposed applications. The foam is rated for harsh climatic exposure including driving rain, dust storms, and hail, functioning as a moisture-weeping barrier against air, insect, and particulate infiltration.
At 45 PPI, the grade achieves the highest tensile strength (22 lb/in minimum) and elongation (200% minimum) in the lower PPI grades of this series, reflecting improved mechanical integrity. Autoclave testing confirms a compression set loss of 25% maximum and a 25% compression load deflection loss of 15% maximum.
Compliant with UL94 HF-1.
What differentiates 45 PPI PVC Coated Reticulated Foam UL94 HF-1 from the 30 PPI and 60 PPI grades?
The 45 PPI PVC Coated Reticulated Foam UL94 HF-1 provides finer filtration and higher mechanical strength than the 30 PPI grade — with tensile strength of 22 lb/in minimum and elongation of 200% minimum — while still delivering a meaningful airflow rate of 12.5 cfm ±2. It is the finest grade in the series to carry a foam grade designation (S-45) with full autoclave and dry heat testing data, and it is rated for automotive and aircraft applications not listed for the coarser grades.
Why is compression set critical for a reticulated foam used in filtration and environmental sealing applications?
Compression set measures the permanent deformation a foam retains after sustained compression. In sealing and filtering applications, the foam is typically installed under compression. If compression set is excessive, the foam will not recover its original thickness, degrading the seal and allowing infiltration of contaminants, moisture, and insects. The 45 PPI PVC Coated Reticulated Foam UL94 HF-1 is rated at 25% loss maximum under standard conditions and 25% maximum under autoclave conditions.
What is the recommended service temperature range for 45 PPI PVC Coated Reticulated Foam UL94 HF-1?
No service temperature range is specified on the manufacturer's TDS for this material.
Is 45 PPI PVC Coated Reticulated Foam UL94 HF-1 suitable for flame-rated environments?
Yes. This grade carries a UL94 HF-1 rating as stated on the TDS.
How should 45 PPI PVC Coated Reticulated Foam UL94 HF-1 be specified?
Specify grade (45 PPI PVC Coated Reticulated Foam UL94 HF-1), thickness, color (Black), compliance requirements (UL94 HF-1), dimensional tolerances, and finished format.
