60 PPI Uncoated Reticulated Foam UL94 HF-1 Rated
60 PPI Uncoated Reticulated Foam UL94 HF-1 Rated is a compressible open cell polyether polyurethane foam with a nominal cell count of 55–65 ppi (CREST), a density of 1.4–1.6 lb/ft³ ±0.10, and a compression force deflection of 0.4–0.6 psi at 25% per ASTM D3574. The material is UL94 HF-1 rated and is used inside extrusions and cavities where it is not exposed to UV or sunlight. It is a very fine-pore grade in the uncoated UL94 HF-1 reticulated foam series.
Key Properties
- Compression Force Deflection @ 25%: 0.4 – 0.6 psi (ASTM D3574)
- Tensile Strength Min: 20 psi (ASTM D3574)
- Elongation: 160% minimum (ASTM D3574)
- Density: 1.4 – 1.6 lb/ft³ ±0.10 (ASTM D3574)
- UL94 HF-1: Rated
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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″ | — |
| Material/Substrate | Polyether Polyurethane Foam | — |
| Color | Black | — |
| Cell Structure | Open Cell | — |
| Cell Count | 55 – 65 ppi | CREST |
| Density | 1.4 – 1.6 lb/ft³ ±0.10 | ASTM D3574 |
Mechanical Properties
| Property | Value | Test Method |
| Compression Force Deflection @ 25% | 0.4 – 0.6 psi | ASTM D3574 |
| Tensile Strength Min | 20 psi | ASTM D3574 |
| Elongation | 160% minimum | ASTM D3574 |
Flame & Fire Performance
| Property | Value | Test Method |
| UL94 HF-1 | Rated | — |
Compliance
- UL94 HF-1 — Rated
- Weep baffling in commercial and residential construction where UL94 HF-1 flame rating and very fine 60 PPI filtration are required for use inside extrusions and cavities not exposed to UV
- General filtering applications requiring very fine 55–65 ppi open-pore filtration with UL94 HF-1 compliance within the 1/4″ to 1″ thickness range
- NEMA enclosure and generator or compressor housing ventilation where fine 60 PPI filtration, UL94 HF-1 flame rating, and an uncoated foam are all specified
- Moisture infiltration barriers in building envelope assemblies inside extrusions requiring UL94 HF-1 compliance and very fine pore filtration
- Draft and air infiltration seals in doors, windows, and access panels where UL94 HF-1 rated uncoated 60 PPI reticulated foam is specified
Common industries: construction, HVAC, fenestration, electrical enclosures, industrial equipment, automotive.
The 60 PPI Uncoated Reticulated Foam UL94 HF-1 Rated is a very fine-pore grade in H-O Products’ uncoated UL94 HF-1 rated reticulated foam series, with a nominal cell count of 55–65 ppi. It is a UL94 HF-1 rated uncoated polyether polyurethane foam designed for general filtering applications and weep baffling in commercial and residential construction, used inside extrusions and cavities not exposed to UV or sunlight.
The TDS product description states “nominal 45 PPI”; however, the TDS title and cell count (55–65 ppi) confirm this is the 60 PPI grade. The TDS features section states the material is available in charcoal gray; however, the Color row in the technical data table lists Black — both are reproduced here as written on the TDS.
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.
The TDS provides a reduced property set: density range 1.4–1.6 lb/ft³ ±0.10, CFD 0.4–0.6 psi at 25%, tensile strength minimum 20 psi, and elongation 160% minimum, all per ASTM D3574 (no suffix), plus UL94 HF-1 Rated. No volumetric air flow rate, compression set, tear strength, air pressure drop, or aging data is listed on the TDS for this grade. No foam grade designation is listed.
Compliant with UL94 HF-1.
What differentiates the 60 PPI Uncoated UL94 HF-1 grade from the 45 PPI and 80 PPI UL94 HF-1 uncoated grades and from the standard 60 PPI Uncoated grade?
The UL94 HF-1 rating distinguishes this grade from the standard 60 PPI Uncoated grade. Within the UL94 HF-1 uncoated series, the 60 PPI grade (55–65 ppi) is finer than the 45 PPI grade and coarser than the 80 PPI grade. Like the standard uncoated 60 PPI grade, it is tested to ASTM D3574 without the -91 suffix and provides a reduced property set of four data properties plus UL94 HF-1 — without air flow, compression set, or aging data.
Why is compression force deflection important for a UL94 HF-1 uncoated reticulated foam?
Compression force deflection determines how readily the foam compresses to fill a cavity under installation force. The 60 PPI UL94 HF-1 grade has a CFD range of 0.4–0.6 psi at 25% per ASTM D3574, indicating moderate resistance that allows the foam to conform to its cavity while maintaining consistent filtration contact for reliable fine pore filtration performance.
What is the service temperature range for the 60 PPI Uncoated Reticulated Foam UL94 HF-1?
A specific service temperature range is not stated on the manufacturer's TDS for this material. No aging performance data is listed on the TDS for this grade.
Is the 60 PPI Uncoated Reticulated Foam UL94 HF-1 suitable for regulated environments?
Yes. The material is UL94 HF-1 Rated, as stated on the TDS. The standard uncoated grade is for use in applications not exposed to UV or sunlight, as stated on the TDS. No additional compliance standards are specified.
How should the 60 PPI Uncoated Reticulated Foam UL94 HF-1 be specified?
Specify grade (60 PPI Uncoated Reticulated Foam UL94 HF-1, cell count 55–65 ppi), thickness, color (confirm Black or Charcoal Gray with H-O Products, as the TDS data table and features section differ), compliance requirements (UL94 HF-1), dimensional tolerances, and finished format. Per the TDS, air flow is the only quantifiable value for determining PPI for published specifications.
