Polyimide Foam
Polyimide foam is the material of choice when aircraft cabin, ECS ducting, or spacecraft thermal control applications require an FST-qualified cellular material that remains dimensionally stable at continuous elevated temperatures where urethane and silicone foams are not rated. Its aromatic polyimide chemistry is inherently flame-resistant, generating minimal smoke and toxic gases, and the SOLIMIDE® aerospace grades carry the FST qualification credentials demanded by aircraft original equipment manufacturers. H-O Products carries the full range of polyimide foam families, from general industrial plain and faced grades to SOLIMIDE® aerospace-certified FST grades for aircraft firewalls, ECS ducting, and spacecraft thermal control, and converts them to customer specification.
SOLIMIDE® AC-530
SOLIMIDE® AC-530 is a lightweight, non-wicking polyimide foam with a maximum density of 0.37 lb/ft³ (5.9 kg/m³), designed for aircraft, aerospace, and industrial thermal and acoustic insulation where low fire, toxicity, and smoke generation are critical. It passes FAA Radiant Panel testing per FAR 25.856(a) and is rated for continuous use up to 400°F (200°C). The material is formaldehyde-free and demonstrates excellent long-term stability under humid conditions and after temperature cycling.
Key Properties
- Density: 0.37 (5.9) Max lb/ft³ (kg/m³) (ASTM D3574 Test A, ISO 845)
- Thermal Conductivity @ 75°F (24°C): 0.36 (0.052) BTU·in/hr·ft²·°F (W/mK) (ASTM C518)
- Max Continuous Use Temperature: 400 (200) °F (°C)
- FAA Radiant Panel FAR 25.856(a): Pass (FAR 25.856(a))
- Smoke Developed Index — Flaming & Non-flaming Modes: < 5 (ASTM E662)
- Noise Reduction Coefficient (NRC), 1 in (25mm): 0.7 (ASTM C423 & E795, Mounting A)
SOLIMIDE® AC-550
SOLIMIDE® AC-550 is a lightweight, non-wicking polyimide foam with a density of 0.44 lb/ft³ (7.1 kg/m³), designed for aircraft and aerospace thermal and acoustic insulation where low fire, toxicity, and smoke generation are critical. It passes FAA Radiant Panel testing per FAR 25.856(a) and is rated for continuous use up to 400°F (200°C). The material is formaldehyde-free and demonstrates excellent long-term stability under humid conditions and after temperature cycling.
Key Properties
- Density: 0.44 (7.1) lb/ft³ (kg/m³) (ASTM D3574 Test A, ISO 845)
- Thermal Conductivity @ 75°F (24°C): 0.32 (0.046) BTU·in/hr·ft²·°F (W/mK) (ASTM C518)
- Max Continuous Use Temperature: 400 (200) °F (°C)
- FAA Radiant Panel FAR 25.856(a): Pass (FAR 25.856(a))
- Smoke Developed Index — Flaming & Non-flaming Modes: < 5 (ASTM E662)
- Noise Reduction Coefficient (NRC), 1 in (25mm): 0.75 (ASTM C423 & E795, Mounting A)
SOLIMIDE® AC-550H
SOLIMIDE® AC-550H is a lightweight, non-wicking polyimide foam with a density of 0.50 lb/ft³ (8.0 kg/m³) — slightly denser than AC-550 for improved thermal properties — designed for aircraft, aerospace, and space applications where low fire, toxicity, and smoke generation are critical. It passes FAA Radiant Panel testing per FAR 25.856(a), is rated for continuous use up to 400°F (200°C), and provides outgassing performance of TMI < 1.0% and CVCM < 0.1% per ASTM E595.
Key Properties
- Density: 0.50 (8.0) lb/ft³ (kg/m³) (ASTM D3574 Test A, ISO 845)
- Thermal Conductivity @ 75°F (24°C): 0.30 (0.043) BTU·in/hr·ft²·°F (W/mK) (ASTM C518)
- Max Continuous Use Temperature: 400 (200) °F (°C)
- FAA Radiant Panel FAR 25.856(a): Pass (FAR 25.856(a))
- Smoke Developed Index — Flaming & Non-flaming Modes: < 5 (ASTM E662)
- Offgassing / Outgassing TMI: < 1.0% (ASTM E595)
SOLIMIDE® CC-306
SOLIMIDE® CC-306 is a lightweight, non-flammable, non-fibrous polyimide foam with a density of 0.50 lb/ft³ (8.0 kg/m³), designed for marine thermal hull insulation in submarines and other marine vessels. It achieves a thermal conductivity of 0.32 (0.046) BTU·in/hr·ft²·°F (W/mK) at 75°F (24°C), a flame spread index of ≤ 5, and a noise reduction coefficient (NRC) of 0.75 at 1 in (25mm). The material is rated for continuous use up to 400°F (200°C).
Key Properties
- Density: 0.50 (8.0) lb/ft³ (kg/m³) (ASTM D3574 Test A, ISO 845)
- Thermal Conductivity @ 75°F (24°C): 0.32 (0.046) BTU·in/hr·ft²·°F (W/mK) (ASTM C518)
- Max Continuous Use Temperature: 400 (200) °F (°C)
- Flame Spread Index: ≤ 5 (ASTM E162)
- Smoke Developed Index — Flaming: 5 (ASTM E662)
- Noise Reduction Coefficient (NRC), 1 in (25mm): 0.75 (ASTM C423 & E795, Mounting A)
SOLIMIDE® HT-340
SOLIMIDE® HT-340 is a lightweight, non-flammable polyimide foam with a density of 0.40 lb/ft³ (6.4 kg/m³), rated for continuous use up to 575°F (300°C) — the highest maximum service temperature in the SOLIMIDE® range. It carries UL 94 V-0 flame rating, passes FAA Radiant Panel testing per FAR 25.856(a), and is certified as an IMO fire-restricting material. A limiting oxygen index of greater than 40% is achieved per ASTM D2863.
Key Properties
- Density: 0.40 (6.4) lb/ft³ (kg/m³) (ASTM D3574 Test A, ISO 845)
- Thermal Conductivity @ 75°F (24°C): 0.32 (0.046) BTU·in/hr·ft²·°F (W/mK) (ASTM C518)
- Max Continuous Use Temperature: 575 (300) °F (°C)
- FAA Radiant Panel FAR 25.856(a): Pass (FAR 25.856(a))
- Limiting Oxygen Index: > 40% (ASTM D2863, ISO 4589-2:1999)
- Noise Reduction Coefficient (NRC), 1 in (25mm): 0.7 (ASTM C423 & E795, Mounting A)
SOLIMIDE® TA-301
SOLIMIDE® TA-301 is a lightweight, non-flammable polyimide foam with a density of 0.40 lb/ft³ (6.4 kg/m³), designed for marine, commercial, and industrial thermal and acoustic insulation. It achieves a thermal conductivity of 0.32 (0.046) BTU·in/hr·ft²·°F (W/mK) at 75°F (24°C), a flame spread index of less than 5, and is rated for continuous use up to 400°F (200°C). The material is compliant with DOD-I-24688 military specification, NFPA 130, US FRA and FTA, and is certified as an IMO fire-restricting material.
Key Properties
- Density: 0.40 (6.4) lb/ft³ (kg/m³) (ASTM D3574 Test A, ISO 845)
- Thermal Conductivity @ 75°F (24°C): 0.32 (0.046) BTU·in/hr·ft²·°F (W/mK) (ASTM C518)
- Max Continuous Use Temperature: 400 (200) °F (°C)
- Flame Spread Index: < 5 (ASTM E84)
- Smoke Developed Index: < 5 (ASTM E662)
Polyimide Foam
Polyimide Foam (PMD) is a lightweight, non-wicking, thermal and acoustic insulation foam with a density of 0.44 lb/ft³ per ASTM D3574 (Test A) / ISO 845, available in 1/2" thickness in Light Yellow. Maximum continuous use temperature is 400°F, thermal conductivity at 75°F is 0.32 btu/(h·ft²·°F) per ASTM C518, and smoke developed index in flaming and non-flaming modes is <5 per ASTM E662. The material meets Boeing BMS 8-300, Boeing (Douglas) DMS 2330, Bombardier BAMS 544-006, Hamilton Sundstrand HS 14190, Lockheed Martin LAC 23-4831, and ASTM C1482, and passes FAR 25.856 (a).
Key Properties
- Density: 0.44 lb/ft³ (ASTM D3574 Test A, ISO 845)
- Maximum Continuous Use Temperature: 400°F
- Smoke Developed Index Flaming & Non-Flaming Modes: <5 (ASTM E662)
- Noise Reduction Coefficient (NRC), 1 in: 0.75 (ASTM C423 / ASTM E795, Mounting A)
- Offgassing/Outgassing TMI: <1.0% (ASTM E595)
- Thermal Conductivity @ 75°F: 0.32 btu/(h·ft²·°F) (ASTM C518)
Polyimide Foam with Rubber Adhesive
Aerospace-Grade Polyimide Thermal and Acoustic Insulation Foam with Rubber PSA
Polyimide Foam with Rubber Adhesive (PMD360) is a lightweight, non-wicking, thermal and acoustic insulation foam with a density of 0.44 lb/ft³ per ASTM D3574 (Test A) / ISO 845, available in 1/2" thickness with a single-sided rubber PSA (SLM360) on a 60# densified kraft backing. Peel adhesion is 96 oz/inch per PSTC-101. Maximum continuous use temperature of the foam is 400°F; maximum continuous use temperature of the rubber adhesive is 180°F. The foam meets Boeing BMS 8-300, Boeing (Douglas) DMS 2330, Bombardier BAMS 544-006, Hamilton Sundstrand HS 14190, Lockheed Martin LAC 23-4831, and ASTM C1482, and passes FAR 25.856 (a). The rubber adhesive meets requirements of GM3622, Chrysler MS-CC211, and Delphi SD2-324.
Key Properties
- Peel Adhesion: 96 oz/inch (PSTC-101)
- Maximum Continuous Use Temperature (Foam): 400°F
- Smoke Developed Index Flaming & Non-Flaming Modes: <5 (ASTM E662)
- Noise Reduction Coefficient (NRC), 1 in: 0.75 (ASTM C423, ASTM E795, Mounting A)
- Offgassing/Outgassing TMI: <1.0% (ASTM E595)
- Density: 0.44 lb/ft³ (ASTM D3574 Test A, ISO 845)
Polyimide Foam with Rubber Adhesive and Aluminum Foil
Polyimide Foam with Rubber Adhesive and Aluminum Foil (PMD360AF) is a lightweight, non-wicking, thermal and acoustic insulation foam composite with a density of 0.44 lb/ft³ per ASTM D3574 (Test A) / ISO 845, available in 1/2" thickness with a single-sided rubber PSA (SLM360) on a 60# densified kraft backing and an aluminum foil facing. Peel adhesion is 96 oz/inch per PSTC-101. Maximum continuous use temperature of the foam is 400°F; the aluminum foil is self-extinguishing with no afterglow or foil rupture exceeding the area of direct flame contact. The composite meets Boeing BMS 8-300, Boeing (Douglas) DMS 2330, Bombardier BAMS 544-006, Hamilton Sundstrand HS 14190, Lockheed Martin LAC 23-4831, ASTM C1482, passes FAR 25.856 (a), and passes FMVSS-302. The rubber adhesive meets requirements of GM3622, Chrysler MS-CC211, and Delphi SD2-324.
