BM-1C is an extremely versatile noise control composite. It consists of (from the top down)
  1. a clear, tough polyester cover for contamination and weather resistance,
  2. a loaded, flexible, 1.6 lb. per sq. ft. barrier for transmission loss,
  3. a 0.25 in. urethane foam decoupler. Barymat BM-1C is very effective as an acoustic lagging to reduce breakout noise in pipes and ducts and can be used to increase transmission loss in walls and ceilings.
BM-1C is easy to cut with common utility knives. Installation is very simple. Sections should overlap to eliminate any gaps in the barrier and maintain best acoustic performance. For secure and permanent installations use reinforced duct- tape, bands or specified adhesive - available from Firwin Corp.
Unit of Measure



N/A Indoor and Outdoor Use
  • Ducting
  • Piping
  • Gas lines
  • Cyclones
  • Fans
  • Stacks
  • Blowers
  • Pumps
  • Machine Housings
  • Cabinets
  • Panels
  • Hydraulic Systems
  • Ceilings and Walls

Noise Levels

N/A H PERFORMANCE - 20 to 40 dBA Reductions

Chart shows typical performance when bonded to 16 gauge steel. Performance will vary according to mass (thickness) of material it is adhered to.

Transmission Loss (db)/Frequency (HZ)
25 Hz 250 500 1000 2000 4000 STC
23 23 30 42 47 53 34

Material Specifications

Sheet Size

N/A 54" x 72" (27 SQ. FT.)

Roll Size

N/A 54" x 30' (135 SQ. FT.)

Material Thickness

N/A APPROX. .3125 in.

Composite Weight

N/A 1.7 LBS./SQ. FT.