BISCO® A2 Fiberglass Reinforced Sound Barrier
BISCO® A2 Fiberglass Reinforced Sound Barrier is a VMQ silicone sound barrier with an embedded fiberglass reinforcement layer, available in three areal densities — 0.20, 0.31, and 0.61 lb/ft² per ISO 2286-2 — with Shore A hardness of 62 per ISO 868 and temperature stability of -58°F to 356°F. The material passes FAR 25.853a flammability, FAR 25.853 (a-1) (AITM 2.0007) smoke density, and FAR 25.856 (a) (AITM 2.0053) flame propagation resistance. Tensile and tear strength values are areal-density-dependent and listed per ISO 37 Type 2 and ISO 4674-1 Method B respectively.
Key Properties
- Hardness, Shore A: 62 (ISO 868)
- Tensile Strength (Wrap): 5076 / 3625 / 1740 lb/ft² — by areal density (ISO 37 Type 2)
- Tear Strength (Wrap/Fill): 114 / 85 / 57 lb/ft² — by areal density (ISO 4674-1 Method B)
- Areal Density: 0.20 lb/ft², 0.31 lb/ft², 0.61 lb/ft² (ISO 2286-2)
- Temperature Stability: -58°F to 356°F
- Flame Propagation Resistance: Pass (FAR 25.856 (a) / AITM 2.0053)
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- Specifications
- Applications
- General Info
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Physical Properties
| Property | Value | Test Method |
| Color | Light Gray | — |
| Polymer Type | VMQ | — |
| Areal Density | 0.20 lb/ft², 0.31 lb/ft², 0.61 lb/ft² | ISO 2286-2 |
| Hardness, Shore A | 62 | ISO 868 |
| Temperature Stability | -58°F to 356°F | — |
Mechanical Properties
| Property | Value | Test Method |
| Tensile Strength (Wrap), 0.20 lb/ft² | 5076 lb/ft² | ISO 37 Type 2 |
| Tensile Strength (Wrap), 0.31 lb/ft² | 3625 lb/ft² | ISO 37 Type 2 |
| Tensile Strength (Wrap), 0.61 lb/ft² | 1740 lb/ft² | ISO 37 Type 2 |
| Tensile Strength (Fill), 0.20 lb/ft² | 3625 lb/ft² | ISO 37 Type 2 |
| Tensile Strength (Fill), 0.31 lb/ft² | 2175 lb/ft² | ISO 37 Type 2 |
| Tensile Strength (Fill), 0.61 lb/ft² | 1160 lb/ft² | ISO 37 Type 2 |
| Tear Strength (Wrap/Fill), 0.20 lb/ft² | 114 lb/ft² | ISO 4674-1 Method B |
| Tear Strength (Wrap/Fill), 0.31 lb/ft² | 85 lb/ft² | ISO 4674-1 Method B |
| Tear Strength (Wrap/Fill), 0.61 lb/ft² | 57 lb/ft² | ISO 4674-1 Method B |
Flame & Fire Performance
| Property | Value | Test Method |
| Flammability | Pass | FAR 25.853a |
| Smoke Density | Pass | FAR 25.853 (a-1) (AITM 2.0007) |
| Flame Propagation Resistance | Pass | FAR 25.856 (a) (AITM 2.0053) |
Compliance
- FAR 25.853a — Compliant (Pass)
- FAR 25.853 (a-1) / AITM 2.0007 — Compliant (Pass, Smoke Density)
- FAR 25.856 (a) / AITM 2.0053 — Compliant (Pass, Flame Propagation Resistance)
- ABS5789 — Compliant (Meets)
- Aircraft acoustic insulation requiring FAR 25.856(a) flame propagation resistance and ABS5789 compliance in a fiberglass-reinforced silicone sound barrier
- Noise reduction liners for aircraft interior panels where additional tensile and tear resistance over non-reinforced sound barrier material is required for installation or service durability
- Aircraft flooring noise barriers requiring a reinforced silicone construction capable of withstanding mechanical stresses not tolerated by unreinforced sound barrier materials
- Rail interior noise blocking applications requiring a flexible, flame-resistant silicone sound barrier with structural reinforcement
- Applications requiring areal-density-selectable sound blocking performance with documented FAR 25.853a flammability and smoke density compliance
Common industries: Aerospace, rail, defense.
BISCO® A2 Fiberglass Reinforced Sound Barrier is a VMQ silicone sound barrier in which fiberglass reinforcement is embedded into the silicone matrix to provide increased tensile and tear strength compared to the non-reinforced A2 Sound Barrier, while maintaining the same level of sound absorption and flame resistance.
The material is designed for aircraft acoustic insulation, interior panel noise reduction liners, aircraft flooring noise barriers, and rail interior noise blocking applications. Innovative filler technology is used to achieve superior flame resistance meeting the radiant panel flammability test FAR 25.856(a).
The product is available in three areal densities — 0.20, 0.31, and 0.61 lb/ft² — with tensile and tear strength values that are areal-density-dependent. For the 0.20 / 0.31 / 0.61 lb/ft² constructions respectively: tensile strength (wrap direction) is 5076 / 3625 / 1740 lb/ft²; tensile strength (fill direction) is 3625 / 2175 / 1160 lb/ft²; tear strength (wrap/fill) is 114 / 85 / 57 lb/ft².
Shore A hardness is 62 per ISO 868 across all constructions. The material passes FAR 25.853a flammability, FAR 25.853 (a-1) (AITM 2.0007) smoke density, and FAR 25.856 (a) (AITM 2.0053) flame propagation resistance. It also meets ABS5789.
Compliant with FAR 25.853a (Flammability), FAR 25.853 (a-1) / AITM 2.0007 (Smoke Density), FAR 25.856 (a) / AITM 2.0053 (Flame Propagation Resistance), and ABS5789.
What differentiates the BISCO® A2 Fiberglass Reinforced Sound Barrier from the non-reinforced A2 Sound Barrier?
The A2 Fiberglass Reinforced Sound Barrier embeds a fiberglass layer directly into the VMQ silicone matrix, providing increased tensile and tear strength compared to the non-reinforced A2 Sound Barrier while maintaining the same level of sound absorption and flame resistance. The reinforced grade is selected where mechanical stresses during installation or in service — such as handling, fastening, or dynamic loading across flooring and panel applications — would cause tearing or tensile failure in an unreinforced construction. It is available in three areal densities (0.20, 0.31, 0.61 lb/ft²) and carries ABS5789 compliance not listed on the non-reinforced A2 TDS.
Why is hardness important for a solid silicone sound barrier used in aircraft and rail applications?
Hardness determines how the material conforms to and loads the supporting structure, and how it responds to acoustic energy impinging on it. For a sound barrier application, a material that is too soft may deflect excessively under panel or flooring loads, reducing installation precision; one that is too hard may not conform adequately to irregular mounting surfaces, creating gaps through which sound can bypass the barrier. The A2 Fiberglass Reinforced Sound Barrier's Shore A hardness of 62 per ISO 868 reflects the stiffness of the VMQ silicone compound at a level consistent with its structural and acoustic barrier function in aircraft and rail interior applications.
What is the temperature stability range for the BISCO® A2 Fiberglass Reinforced Sound Barrier?
The temperature stability range is -58°F to 356°F as listed on the TDS.
Is the BISCO® A2 Fiberglass Reinforced Sound Barrier suitable for regulated aerospace environments?
Yes. The material passes FAR 25.853a (flammability), FAR 25.853 (a-1) / AITM 2.0007 (smoke density), and FAR 25.856 (a) / AITM 2.0053 (flame propagation resistance), and meets ABS5789, as listed on the TDS.
How should the BISCO® A2 Fiberglass Reinforced Sound Barrier be specified?
Specify grade (A2FIBSOUSIL), areal density (0.20, 0.31, or 0.61 lb/ft²), color (Light Gray), applicable compliance requirements (FAR 25.853a, FAR 25.856(a), ABS5789), dimensional tolerances, and finished format (sheet, slit roll, or die-cut component).
