While wpc foam board is an extremely popular building material, its critics deride it for certain health and environmental dangers, especially when its entire life cycle is considered. Touted for its flame resistance, PVC can smolder unnoticed and release extremely dangerous gasses that present both acute and chronic health hazards to building occupants, fire fighters, and surrounding communities. The following two products of PVC combustion are of particular concern:

hydrogen chloride, which is a corrosive, highly toxic gas that can burn skin and cause severe, permanent respiratory damage; and
dioxin, the most dangerous known man-made carcinogen, which will persist in the environment for a long period of time. PVC is the largest contributor to the world’s dioxin burden.
PVC has also been blamed for emitting chemical softeners called phthalates (in vinyl flooring), lead additives (in blinds), and toxic glues. For instance, one study of PVC shower curtains found that they released phthalates capable of causing nausea and damage to the liver and reproductive system. Vinyl chloride, an essential component of PVC, is a carcinogenic and potentially explosive gas with a mild, sweet odor. It can enter drinking water released from contact with PVC pipes, according to the U.S. Environmental Protection Agency.

Disposal of PVC is problematic because its unique characteristics make ordinary disposal unsafe or otherwise difficult; it does not decompose when buried, and it releases dangerous gasses when incinerated. Much of the PVC used in buildings eventually winds up in landfills where it can easily smolder and release a significant amount of deadly gasses. Manufacturers counter this argument by pointing out that PVC's resilience makes it appear in landfills less than its alternatives, and that some landfill liners are actually composed of PVC.

Thermal depolymerization has been developed to convert used PVC into other usable materials, but this method is rarely employed. The multitude of additives used to create PVC make large-scale recycling so cumbersome and expensive that manufacturers find it more cost-effective to make new PVC. Only 0.5% of the plastic is actually recycled, according to the Healthy Building Network.

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