Fiberglass Roving & Silent Packs
ISW SILENT PACKS are used for packing internal exhaust / muffler components, auto compartments/cabins or even residential cinder blocks to provide excellent long term sound absorption. SILENT PACKS are made from a continuous filament, single-end roving product manufactured with boron-free modified E-Glass (E-CR) composition fibers. ISW’s Fiberglass E-CR Roving is engineered to provide excellent sound absorption in high temperature and corrosive exhaust systems.
FEATURES / BENEFITS OF ISW ROVING:
- ISW’s E-CR Fiberglass Roving is OEM approved and Made in the USA.
- The sizing chemistry of the individual fibers produces pillows that are uniformly volumized with a lofty roving that has low fuzz and fly for efficient long term acoustical performance.
- Has higher thermal and better chemical durability than basalt or standard e-glass.
- Is less sensitive to high humidity versus other leading E-CR roving.
- Increased fiber strength over both basalt and standard E-glass fibers even at elevated temperatures.
- Reduces opportunities for shell corrosion caused by fiberglass mat.
- Is designed to easily open to provide uniform and effective acoustic properties.


ISW SILENT PACKS:
- Are filled with leading edge volumizing equipment to precisely fill bags to the correct weight with a lofty fiber distribution to conform to OEM requirements.
- Are an alternative to expensive direct filling equipment and tooling costs.
- Are designed to effectively fill stamped or tubular exhaust components.
- Offer a convenient fill that is more efficient to install than fiberglass mat without the dust and mess.
- SILENT PACKS can be made from:
- Woven or Mesh E-glass fabric material formed into pouches, tubes or custom shapes sewn with a fine polyester thread that will emit little to no smoke or odor at start up.
- Low cost polypropylene bags that burn off at start up.
- Use ISW Stainless Steel Wool Tubes, wraps or end cap insulators for improved long term durability.


PHYSICAL PROPERTY: | ISW E-CR ROVING |
Max Service Temp | 735°C / 1355°F |
Softening Point | 916°C / 1681°F |
Thermal Expansion Coefficient | 5.46 10-6/ °C |
Fiber Glass Density | 2.63 g/cm3 |
Average Fiber Diameter | 24 µm |
Pristine Fiber Strength | 3500 Mpa |
Reflective Index | 1.56 |
Roving Tex, nominal | 4800 g/km |