There are not too many resources for mass loaded vinyl in the metropolitan Los Angeles area. Mass Loaded Vinyl or (MLV) as it is know in the industry is a high grade vinyl material the is impregnated with barium salts and silica to give it the mass of real lead sheeting, yet this material contains no lead.
MLV is a standard in the soundproofing industry because of it's ability to block and reflect unwanted noise through walls ceilings and even floors. MLV can be used in lieu of using Lead sheeting which is heavy and cumbersome and has a list of hazards all it's own. The Mass Loaded Vinyl emulates the lead sheeting but contains no lead or lead by products.