Mass Loaded Vinyl (MLV)


Mass Loaded Vinyl (MLV) is a classic sound transmission blocker. Due to MLV's flexibility, it is ideal for use with ducts, pipes and steel framing.

  • High tear and tensile strength
  • Significant reduction in sound transmission.
  • Massive, limp, flexible, formable and versatile

Mass Loaded Vinyl has been an industry standard in noise control for decades. While there are many trade names for this material, all are a simple PVC sheet, loaded with Barium Sulfate or Calcium Silicate to add weight. Mass Loaded Vinyl is very dense, weighing one pound per square foot. This mass is what allows the MLV to be so effective at reducing airborne noise.

MLV can be used in walls, floor and ceilings to significantly increase the mass of these surfaces. MLV is an excellent barrier for use in walls, floors and ceilings. Additionally, Mass Loaded Vinyl can be used as a barrier material to wrap metal ducts, plastic plumbing pipe, steel columns, etc.

This is extruded MLV, not cast. Cast MLV tears much more easily and is also more difficult to install than extruded.


MLV Specifications

Mass Loaded Vinyl has traditionally been “loaded” with heavy Barium Sulfate. That is much less common today, and most MLV made in the USA is made with Calcium Silicate. While it is common to still see “Barium Loaded Vinyl” on an architectural spec, the fact is that Barium is rarely used any longer as a filler.

Material: Extruded Mass Loaded
Vinyl with Calcium Silicate
Width: 48” x 25’ (1 lb.)
54” x 30’ (1 lb.)
48” x 18’ (2 lb.)
54” x 15’ (2 lb.)
Color: Black
Surface: Smooth finish
Density/Weight: 1.0 lb. per sq.ft.
2.0 lb. per sq.ft.
Thickness: 1/8″(1 lb.)
Tensile Strength: 500psi
Die “C” Tear: 100 lb.
Shore A Durometer: 85 +/-5
Elongation: 90%
Burn Test: Meets MVSS302
ULP4 – HF-1
Service Temp: -20F – 180F
STC: 26 (1lb.)

MLV Soundproof Performance

*In the United States, MLV is loosely described as “1/8” and 1 pound per square foot”.” This is simply a common description. When various samples from various manufacturers are compared, one finds that none are actually 1/8” and most are not exactly 1 pound. This is the way MLV is manufactured, specified and sold here in the States. The 1/8″ dimension is simply part of an informal description that we as an industry use.

The weight of Mass Loaded Vinyl will vary +5%. We (like all MLV manufacturers) manufacture to a weight criterion, not a dimensional criterion. In general the weight will be 1 pound per square foot +5%. Additionally, the 1 pound material thickness 0.105 inch (2.67mm), again, +5%.

Mass Loaded Vinyl Test

STC Source Side Studs Insulation Receive Side Test #
45 1/2″ Drywall + MLV + 1/2″ Drywall 24″ oc R13 1/2″ Drywall OL 05-1054


MLV Installation:


1 lb – 48” x 25’, 1 lb – 54” x 30’, 2 lbs – 48” x 18’, 2 lbs – 54” x 15 ’