BlockAid® Vinyl Sound Barrier BlockAid® Vinyl Sound Barrier, also known as mass loaded vinyl (MLV), is a limp-mass material used to block unwanted noise and reduce sound transmission without reducing space. Listing Back To Top Design Visualizer Previous Next Downloads Product Info About Media Specs Specs Get In Touch Add to Project+ Favorite User Feedback Company Resources Back to top Videos Educational Videos Photos Project Gallery Brochures Product Brochures