Mass Loaded Vinyl (MLV) is a safe, non-toxic noise barrier
designed to hang as a limp mass in a variety of soundproofing
applications. MLV offers an alternative to Lead, at a lower price
point. Mass loaded vinyl is available in one or two pound per square
foot density - abbreviated as MLV 1# or MLV 2#, respectively.
systems combine mass, isolation, absorption, and damping to achieve the
sound reduction results best suited for the application. MLV noise
barrier adds mass in a minimal thickness. The MLV 1# is 1/8" thick.
The MLV 2# is 1/4" thick. The MLV is typically embedded behind the
finished walls, floor, or ceiling materials.
Sound Transmission Class
The industry standard unit of measure
for a sound barrier material or wall, ceiling, or floor assembly is
referred to as the Sound Transmission Class (STC). A standardized test,
performed in a certified, independent, soundproof lab, measures the
transmission loss between a sound source (Source) and a target room
(Target). Measurements are taken over a range of 6 frequency points
ranging from 125Hz to 4000Hz. The sound in the Source and Target rooms is measured. The difference between the two is the transmission loss.
table summarizes the STC rating for the various MLV products.
Acoustic Transmission Loss (dB)
| Frequency (Hz)|| 100|| 250|| 500|| 1000|| 2000|| 4000|| STC|
|Non-reinforced MLV 1#|| 16||17|| 21|| 26|| 31|| 36|| 26|
|Non-reinforced MLV 2#|| 19|| 19|| 27|| 34|| 38|| 43|| 32|
|Reinforced MLV 1#|| 17|| 18|| 22|| 27|| 33|| 37|| 27|
|MLV 1# with Closed Cell Foam, carpet underlay|| 13|| 15|| 23|| 25|| 33|| 38|| 27|