PORON® AquaPro® Formulation 37
PORON AquaPro Formulation 37 is a cellular polyurethane foam designed for applications requiring excellent moisture and water resistance, cast directly onto a 0.05 mm (2 mil) clear PET film. The material delivers 41–110 kPa (6–16 psi) CFD at 25% deflection, very low outgassing (TML 0.58%, CVCM 0.02%), no fogging per SAE J-1756, and a recommended constant use temperature of 90°C (194°F). Ideal for sealing and gasketing where high humidity resistance and low outgassing are critical.
Key Properties
- Compression Force Deflection: 41–110 kPa (6–16 psi) @ 25% deflection (ASTM D3574-95)
- Compression Set, % max (after 24 hr recovery): 10 @ 70°C (158°F) (ASTM D3574-95 Test D)
- Outgassing — TML: 0.58% (ASTM E595)
- Outgassing — CVCM: 0.02% (ASTM E595)
- Density: 304 kg/m³ (19 lb/ft³) ± 32 (2) (ASTM D3574-95, Test A)
- Recommended Constant Use Temperature (Max.): 90°C (194°F)
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- Specifications
- Applications
- General Info
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Physical Properties — PORON® Foam
| Property | Value | Test Method |
| Color (Code) | Black (04) | — |
| Density | 304 kg/m³ (19 lb/ft³) | ASTM D3574-95, Test A |
| Density Tolerance | ± 32 kg/m³ (2 lb/ft³) | ASTM D3574-95, Test A |
| Thickness | 0.50–1.0 mm (0.020–0.039″) | — |
| Thickness Tolerance | ± 0.10 mm (0.0039″) | — |
| Compression Force Deflection | 41–110 kPa (6–16 psi) | ASTM D3574-95; 0.51 cm/min, 25% deflection |
| Compression Set, % max (after 24 hr recovery) | 10 | ASTM D3574-95 Test D @ 70°C (158°F) |
Thermal Properties
| Property | Value | Test Method |
| Recommended Constant Use Temperature (Max.) | 90°C (194°F) | — |
| Recommended Intermittent Use Temperature (Max.) | 121°C (250°F) | UL 157 |
Outgassing
| Property | Value | Test Method |
| Fogging | No Fogging | SAE J-1756, 3 hrs @ 100°C (212°F) |
| Outgassing — Total Mass Loss (TML), % | 0.58 | ASTM E595, 24 hrs @ 125°C, < 7 × 10³ Pa |
| Outgassing — CVCM, % | 0.02 | ASTM E595 |
| Outgassing — Water Vapor Regain (WVR), % | 0.09 | ASTM E595 |
Environmental Properties
| Property | Value | Test Method |
| Moisture Absorption — High Humidity, % Weight Gain | 1.1 | AMS 3568 |
| Water Immersion, % Weight Gain | 2.84 | ASTM D1056 |
| Water Absorption — Vacuum Exposure, % Weight Gain | 0.94 | ASTM D570 |
| Water Absorption — ASTM 3568B, % Weight Gain | 0.33 | ASTM 3568B |
Supporting Material — Clear Polyester Film (PET) 0.05 mm (2 mil)
| Property | Value | Test Method |
| Density | 1395 kg/m³ (87.1 lb/ft³) | ASTM D1505 |
| Tensile Strength — MD | 3.5 × 10⁶ kPa (500,000 psi) | ASTM D882 |
| Modulus — MD | 2.1 × 10⁵ kPa (30,000 psi) | ASTM D882 |
| Yield Strength (F5) — MD | 1.0 × 10⁵ kPa (15,000 psi) | ASTM D882 |
| Ultimate Elongation | 150% | ASTM D882 |
| Coefficient of Friction A/B (Kinetic) | 0.40 | ASTM D1894 |
| Shrinkage — MD, % (TD) | 1.2 (0.0) | 39 min @ 150°C (302°F) |
- Moisture-resistant seals and gaskets
- Environmental sealing in outdoor and high-humidity service
- Outdoor and high-humidity electronics sealing
- Automotive sealing applications
- Low outgassing applications where TML and CVCM limits must be met
Common industries: automotive, outdoor electronics, and low-outgassing sealed assemblies.
PORON AquaPro Formulation 37 is a cellular polyurethane foam within the PORON AquaPro family, formulated specifically for applications requiring excellent moisture and water resistance paired with very low outgassing. The material is cast directly onto a 0.05 mm (2 mil) clear polyester (PET) film, creating a permanent bond for easy handling and die-cut precision.
It is positioned for sealing and gasketing applications in outdoor, high-humidity, and automotive environments where both moisture ingress protection and low fogging / outgassing are critical requirements — including outdoor and high-humidity electronics and low-outgassing applications.
Physical properties include 304 kg/m³ (19 lb/ft³) density (± 32 kg/m³), 0.50–1.0 mm (0.020–0.039″) thickness with ± 0.10 mm (0.0039″) tolerance, and 41–110 kPa (6–16 psi) CFD at 25% deflection. Compression set is 10% max after 24-hour recovery at 70°C (158°F). Temperature resistance is 90°C (194°F) maximum constant use and 121°C (250°F) maximum intermittent use per UL 157.
Outgassing is documented at TML 0.58%, CVCM 0.02%, and WVR 0.09% per ASTM E595. No fogging per SAE J-1756 at 3 hrs @ 100°C (212°F). Environmental water performance includes: moisture absorption 1.1% weight gain at high humidity (AMS 3568), water immersion 2.84% weight gain (ASTM D1056), water absorption under vacuum 0.94% weight gain (ASTM D570), and water absorption per ASTM 3568B 0.33% weight gain.
The 0.05 mm (2 mil) clear PET supporting film delivers 1395 kg/m³ (87.1 lb/ft³) density, 3.5 × 10⁶ kPa (500,000 psi) tensile strength MD, 2.1 × 10⁵ kPa (30,000 psi) modulus MD, 1.0 × 10⁵ kPa (15,000 psi) yield strength MD, 150% ultimate elongation, 0.40 kinetic coefficient of friction, and 1.2% MD shrinkage at 39 min @ 150°C (302°F).
What differentiates PORON AquaPro Formulation 37 from standard PORON Soft Seal grades?
AquaPro Formulation 37 is specifically engineered for moisture and water resistance, where standard PORON Soft Seal grades are not. The key differentiators are the very low outgassing (TML 0.58%, CVCM 0.02%, WVR 0.09% per ASTM E595), no fogging per SAE J-1756, and documented water absorption results across multiple test methods (AMS 3568, ASTM D1056, D570, 3568B) — a profile not available on the standard 4701-series grades. It is selected when the sealing environment involves prolonged moisture exposure, condensation, or outgassing-sensitive electronics.
Why is compression set critical for this material?
Compression set measures the foam's ability to recover its original thickness after sustained compression. For moisture seals and environmental gaskets, a foam that takes a permanent set will no longer fill the gap and seal effectively against water intrusion. AquaPro Formulation 37 delivers 10% max compression set after 24-hour recovery at 70°C (158°F) per ASTM D3574-95 Test D, supporting long-term sealing integrity in humid and outdoor service.
What is the operating temperature range for PORON AquaPro Formulation 37?
Recommended constant use temperature is 90°C (194°F) maximum; recommended intermittent use temperature is 121°C (250°F) maximum per UL 157.
Is PORON AquaPro Formulation 37 suitable for low-outgassing or automotive environments?
Yes. The material passes SAE J-1756 fogging (no fogging at 3 hrs @ 100°C) and is documented with TML 0.58%, CVCM 0.02%, and WVR 0.09% per ASTM E595 — making it suitable for low-outgassing electronics and automotive interior sealing where fogging and condensation of volatiles on surfaces is a concern.
How should PORON AquaPro Formulation 37 be specified?
Specify grade (PORON AquaPro Formulation 37), thickness (within 0.50–1.0 mm range), color (Black, Code 04), support (0.05 mm clear PET film), CFD range (41–110 kPa at 25%), outgassing requirements (TML/CVCM per ASTM E595), water absorption test basis, dimensional tolerances, and finished format.
