HT70 UL High Temp
HT70 is a high-temperature, low-density, industrial closed-cell PVC foam with a water-based acrylic pressure-sensitive adhesive on one side, available in four thicknesses: 1/16″, 1/8″, 3/16″, and 3/8″. Shore 00 hardness is 25 per ASTM D2240, density is 6.2–10.0 lb/ft³ per ASTM D1667, and compression deflection is 1.8 psi per ASTM D1667. The material is a recognized component of Underwriters Laboratories® (UL File Number E 112126, QMFZ2), rated UL 94 HF-1/HBF. It is sulfur free and low VOC.
Key Properties
- Compression Deflection: 1.8 psi (ASTM D1667)
- Tensile Strength: 21 psi (ASTM D412)
- Elongation Without Adhesive: 170% (ASTM D412)
- Density: 6.2–10.0 lb/ft³ (ASTM D1667)
- Durometer/Hardness (Shore 00): 25 (ASTM D2240)
- UL File Number: E 112126 (QMFZ2) — 94 HF-1/HBF
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- Specifications
- Applications
- General Info
- FAQs
Physical Properties
| Property | Value | Test Method |
| Thickness | 1/16″, 1/8″, 3/16″, 3/8″ | — |
| Color | Black | — |
| Material/Substrate | Polyvinyl Chloride (PVC) | — |
| Density | 6.2–10.0 lb/ft³ | ASTM D1667 |
| Durometer/Hardness (Shore 00) | 25 | ASTM D2240 |
Adhesion Properties
| Property | Value | Test Method |
| Adhesive System | Permanent Adhesive | — |
| Adhesive Side | Single Sided Adhesive | — |
| Adhesive Type | Acrylic (Water based) | — |
| Adhesion to Stainless Steel | >30 oz/in | — |
Mechanical Properties
| Property | Value | Test Method |
| Compression Deflection | 1.8 psi | ASTM D1667 |
| Compression Force @ 25% | 4.4 psi | ASTM D1667 |
| Water Absorption | 2.5% | ASTM D1056 |
| Tensile Strength | 21 psi | ASTM D412 |
| Elongation Without Adhesive | 170% | ASTM D412 |
| Elongation With Adhesive | 150% | ASTM D412 |
Flame & Fire Performance
| Property | Value | Test Method |
| UL File Number | E 112126 (QMFZ2) | 94 HF-1/HBF |
Compliance
- UL 94 HF-1/HBF — Recognized Component (UL File Number E 112126, QMFZ2)
- Electrical panel sealing and gasketing applications requiring a UL 94 HF-1 recognized component PVC foam with low-outgassing and sulfur-free formulation
- HVAC sealing applications requiring a high-temperature, flame-rated, low-density closed-cell PVC foam
- UL-listed lighting and appliance applications where the UL recognized component designation (File Number E 112126, QMFZ2) is required for the finished assembly listing
- Industrial sealing applications requiring UV, petroleum, and cleaning solution resistance in a single-sided PSA PVC foam rated UL 94 HF-1/HBF
- Any sealed assembly where a UL fire rating is required and a soft, conformable, low-density PVC foam is needed
Common industries: Electrical, HVAC, appliance, lighting, industrial manufacturing.
HT70 is a high-temperature, low-density, industrial closed-cell PVC foam with single-sided water-based acrylic PSA, formulated specifically to conform to UL 94 HF-1 and recognized as a component of Underwriters Laboratories® under File Number E 112126 (QMFZ2), rated UL 94 HF-1/HBF.
Available in four thicknesses (1/16″, 1/8″, 3/16″, 3/8″), it is designed for electrical panel applications, HVAC, UL lighting applications, appliances, and any assembly where a UL fire rating is required. The product is the only grade in the high-temperature PVC foam series with a UL recognized component listing.
HT70 is sulfur free to eliminate fogging, low VOC to eliminate outgassing, and resistant to UV, petroleum, and cleaning solutions. Adhesion to stainless steel is >30 oz/in. Compression force at 25% is 4.4 psi per ASTM D1667. Water absorption is 2.5% per ASTM D1056. Elongation is reported separately with adhesive (150%) and without adhesive (170%) per ASTM D412. No service temperature is explicitly listed on the TDS beyond the description “high temperature.” No flammability standard test method column value is listed for the UL file number entry.
Compliant with UL 94 HF-1/HBF — UL Recognized Component (File Number E 112126, QMFZ2).
What differentiates HT70 from the 100-HTA and 60-HTA high-temperature PVC foam grades?
HT70 is the only grade in the high-temperature PVC foam series with a UL recognized component listing — UL File Number E 112126 (QMFZ2), rated 94 HF-1/HBF — making it the appropriate choice when the finished assembly requires a UL-listed foam component. It is the lowest-density grade in the series at 6.2–10.0 lb/ft³ with the lowest compression deflection (1.8 psi) and Shore 00 hardness (25). Unlike the 100-HTA and 60-HTA grades, HT70 does not list GMW 17408 or GMW 3232 compliance, ozone resistance, or compression set/aged resistance values. It is the only grade in the series listed for electrical panel applications and UL lighting.
Why is compression deflection important for a UL-rated high-temperature PVC foam used in electrical and HVAC sealing?
In electrical panel and HVAC sealing applications, the foam must conform to the mating surfaces under the applied closure force while maintaining a durable seal against moisture, dust, and air infiltration. A low compression deflection — 1.8 psi for HT70 — ensures the foam can be fully compressed under low enclosure closure forces, which is typical in panel and appliance door assemblies. Maintaining the seal integrity over the temperature range and service life of the assembly is the primary performance requirement for a UL-rated enclosure gasketing foam.
What is the service temperature range for HT70?
No service temperature range is explicitly listed on the HT70 TDS. The product is described as a high-temperature PVC foam. End-users should contact H-O Products for guidance on specific service temperature performance.
Is HT70 suitable for regulated UL-listed environments?
Yes. HT70 is a UL recognized component under File Number E 112126 (QMFZ2), rated UL 94 HF-1/HBF, as listed on the TDS. It is specifically formulated to conform to UL 94 HF-1.
How should HT70 be specified?
Specify grade (FSHT70), thickness (1/16", 1/8", 3/16", or 3/8"), color (Black), adhesive type (water-based acrylic PSA, single sided), UL recognized component compliance (UL 94 HF-1/HBF, File Number E 112126, QMFZ2), dimensional tolerances, and finished format (sheet, slit roll, or die-cut component).
