“Today’s announcement by Home Depot that it will require manufacturers to phase out phthalate plasticizers from all of the vinyl flooring products it sells was the latest in a long history of efforts to eliminate hazardous additives from vinyl building products. But this does not mean that all phthalate-free vinyl floors (and other PVC products) are now free of potential concerns for building occupants.
Healthy Building Network (HBN) research found that recycled PVC used in building products usually contains legacy toxic hazards like lead, cadmium, and phthalates. (PVC is short for polyvinyl chloride, or “vinyl.”) We reveal this and more in our new report, Post-Consumer Polyvinyl Chloride in Building Products, published today.
HBN examined the supply chain for vinyl flooring. We discovered that post-consumer PVC used in flooring is more likely to come from insulation jackets stripped from old cables and wires than from discarded vinyl flooring. These jackets typically contain high levels of heavy metals, problematic plasticizers, and even PCBs – substances that building product manufacturers have worked to eliminate from their consumer products in recent years.
While we tracked the recycled PVC supply chain, the Ann Arbor, Michigan-based Ecology Center tested scores of vinyl floors sold by retail stores. They shared their results with HBN and generously allowed us to debut their findings in this report.
The Ecology Center tests revealed content previously unknown to the public. Using an X-Ray Fluorescence (XRF) device on 74 floors, the Ecology Center determined that each inner layer likely contained electrical and electronic PVC waste. And the recycled PVC had surprisingly high levels of heavy metals. In at least 69% of the floors’ inner layers, lead was present above the concentrations allowed in children’s toys. The XRF tests detected as much as 2% cadmium and 1% lead. This is a lot of lead and cadmium.
As PVC products age, they can release heavy metals. In 1996, the Consumer Products Safety Commission found that surface lead levels of 1.23 percent in deteriorating PVC mini-blinds “were high enough to present a lead poisoning hazard to children 6 years of age and younger if they ingested small amounts of dust from the blinds over a short period of time. Some states have identified children with elevated blood lead levels attributable to vinyl mini-blinds.”
Few PVC recycling operations, whether small-scale or industrial, screen their inputs for toxicants. A recycling consortium in Europe acknowledges that phthalates and heavy metals remain in the recycled PVC feedstocks that they currently produce, and that these substances are present above regulatory thresholds of concern.
Over the past year, HBN has been examining the supply chain of recycled feedstocks in conjunction with StopWaste, a public agency responsible for reducing the waste stream in Alameda County, CA, and with support from the San Francisco Department of the Environment. Our collaboration’s goal is to identify the best practices for optimizing recycled materials – to increase recycling rates while minimizing toxic content – that can be used in building products.
Wes Sullens of StopWaste is optimistic about the future of recycling. “While HBN’s research has identified some serious problems with certain sources of recycled PVC, it also identifies opportunities to clean it up for use in building products,” he notes. “Manufacturers and suppliers have shown the ability to screen, eliminate or minimize problematic ingredients that can affect the quality of future recycled content feedstocks. I am excited by this convergence of interests, and its potential to create higher-value and healthier products.”
Watch our next newsletter for the good news about what PVC flooring manufacturers are doing to address these issues.
Funding for research on post-consumer PVC feedstock was provided by StopWaste and donors to the Healthy Building Network (HBN). An evaluative framework to optimize recycling developed by StopWaste, the San Francisco Department of the Environment, and HBN, guided our research. Today’s post-consumer recycled PVC evaluation is a prequel to a forthcoming white paper by this new collaboration. It will identify pathways to optimize the benefits of using post-consumer recycled feedstocks in building products sold in the Bay Area of California and beyond.”