Yes, MLV is effective at blocking out noise. MLV's physical properties make it capable of true soundproofing. It will contain sound to the room it was created in or keep it out of one that you want to keep quiet.
Sound goes between rooms in two ways — through the air or through a structure. Sound pokes through cracks or wiggles through walls. Walls are harder for sound to get through because they have a higher density than air. The denser a substance is, the more difficult it is for sound to move through. MLV fortifies a surface's density while also covering any cracks, reducing sound transmission.
We even assign each MLV product a metric to show how effective it is — sound transmission class (STC). STC ratings describe how effective a surface or material is at preventing noise from traveling between rooms.
The higher a product's STC rating, the more capable it is of blocking sound. Materials with an STC rating of up to 25 allow normal speech to be understood through a wall. By 50, loud sounds are hardly audible on the other side. Our MLV sheets have STC ratings ranging from 27-32 depending on thickness — excellent performance for a material as thin and lightweight as MLV.