What Is Polyvinyl?

If you’re like me, you notice that terms like polyvinyl, vinyl products, and synthetic polymers pop up everywhere. Whether you’re reading about consumer product safety, the environmental impact of what we bring into our homes, or scanning the back of your favorite laundry detergent, polyvinyl seems to show up again and again. As an experienced researcher and mom, I found myself asking: What is polyvinyl, really? And how do the different types, like polyvinyl chloride and polyvinyl alcohol, affect our health and the environment?

This question led me down a rabbit hole of scientific literature, government health reports, and product labels. There’s a lot to unpack, and it’s worth learning the distinctions between polyvinyl types, their manufacturing process, their usage, and whether they’re something we should avoid. Today, I’m sharing what I’ve discovered so you, too, can feel empowered to make knowledgeable decisions for a non-toxic home.

What Is Polyvinyl?

Let’s start with a clear, science-backed overview of polyvinyl. This will help you spot it in everyday household items and understand how it can impact your health and the environment. I’ll explain what polyvinyl is, highlight differences between polyvinyl chloride and polyvinyl alcohol, and cover important safety and environmental impact considerations. Most importantly, we’ll review how studies show links to concerning substances like heavy metals and volatile organic compounds. Whether it’s the water you drink or the detergent pods you use, this guide shines a light on what’s behind the label.

Manufacturers make polyvinyl by linking many small vinyl molecules, derived from crude oil or natural gas, into long chains. These versatile synthetic polymers create everyday products, from PVC pipes to water-soluble laundry detergent pods. The two main types, polyvinyl chloride (PVC) and polyvinyl alcohol (PVA), differ in chemical makeup and uses.

Many people lump all vinyl products together, but understanding these differences lets you see how each works and what risks they might pose. Since vinyl plastics appear so often in daily life, knowing what sets them apart helps you make smarter choices.

What Is Polyvinyl Chloride?

Let’s start with one of the most common polyvinyl materials you’ll encounter: polyvinyl chloride (PVC). PVC was first produced in the 1930s, and its demand has steadily increased since then. It is highly versatile and inexpensive, and it’s common both in flexible applications like shower curtains and tubing, and rigid uses such as pipes or windows. Consequently, PVC is one of the most-produced synthetic plastic polymers worldwide (source).

So, what makes PVC different from other polyvinyl plastics? It has to do with the elements added in the manufacturing process. These ingredients provide insights into PVC’s toxicity concerns as well. We will discuss this next.

What Is Polyvinyl Chloride Made Of?

To begin, ethylene is the primary initial chemical used to produce most vinyl-based industrial chemicals. This foundational knowledge helps explain the starting point for the vast majority of vinyl products.

1. Ethylene originates from crude oil or natural gas, refined into lighter-weight substances like ethane.  
2. From there, manufacturers steam-crack ethane at very high temperatures to produce ethylene (source).
3. Then, in the case of PVC, ethylene goes in reaction with chlorine to make vinyl chloride monomers (VCM). Notably, vinyl chloride is a group A human carcinogen (source).
4. Next, VCMs group into chains through a process called polymerization.
5. Lastly, plasticizers (such as phthalates), heat stabilizers (which historically included lead or cadmium and other heavy metals), colorants, flame retardants, and others are added. These additives are designed for stability, flexibility, and durability (source and source).

Important to note: The manufacturing process and final consumer product can contain residual amounts of these chemicals (source).

Is Polyvinyl Chloride Safe?

The toxicity profile of polyvinyl chloride depends on several factors, including the additives used, the material’s processing, and the conditions of its exposure. Studies show that:

• Vinyl chloride may leach from PVC pipes, albite in minimal amounts. More recent PVC formulations generally have much lower residual vinyl chloride than other PVC, and the leaching is usually below regulatory limits or detectable levels (source).
• Manufacture and disposal of PVC releases hazardous chemicals, including dioxins, heavy metals, and vinyl chloride, into the environment (source).
• Flexible PVC products may release plasticizers (e.g., phthalates, bisphenols), some of which can act as endocrine disruptors and are linked to reproductive and developmental effects (source and source).
• Lead and cadmium-containing stabilizers, though banned in many regions, can still be found in imported or older products (source).
• Migration of additives and microplastics into drinking water or food is a long-term concern (source).

If you’re aiming for a non-toxic home, minimizing your use of PVC, especially in products that come into direct contact with drinking water, food, or children, can be a wise precaution.

What Products Have Polyvinyl Chloride?

PVC can contribute to off-gassing volatile organic compounds (VOCs), phthalates, and other additives. Awareness is key to reducing unnecessary exposure. To empower you in making safer choices, here’s a list of typical products that may contain PVC:

• plumbing pipes and fittings
• window frames and doors
• vinyl flooring and wall coverings
• shower curtains, raincoats, faux leather and accessories (flexible PVC)
• medical devices (tubing, IV bags)
• sports equipment and toys
• shrink wrap and blister packs for pharmaceuticals
• blinds and upholstery
• irrigation pipes (source and source).

What Is Polyvinyl Alcohol?

Polyvinyl alcohol (PVA) is a synthetic polymer that has become popular as a more “sustainable” plastic alternative in recent years. Polyvinyl alcohol comes in various physical forms. Manufacturers often use PVA to create thin, flexible water-soluble films, such as those used in laundry detergent pods or packaging. At the same time, they can process it into thicker hydrogels, depending on its concentration (source).

What Is Polyvinyl Alcohol Made Of?

While PVA begins the same as PVC, you will see how quickly its chemical makeup differs during production (source, source, and source).

1. Ethylene is produced by cracking ethane, a hydrocarbon from crude oil or natural gas.
2. Ethylene reacts with acetic acid (vinegar) and oxygen under specific conditions to form vinyl acetate monomer (VAM).
3. Vinyl acetate monomers undergo polymerization to create polyvinyl acetate (PVAc), a resin.
4. Polyvinyl acetate is then hydrolyzed (also called alcoholysis) to replace acetate groups with alcohol groups, converting PVAc into polyvinyl alcohol (PVA).
5. The resulting PVA is purified through neutralization, washing, and drying steps to obtain a stable, water-soluble polymer product.

Is Polyvinyl Alcohol Safe?

Generally speaking, PVA is somewhat safer than PVC due to the types of ingredients used in its production. Furthermore, because it dissolves in water, one can say it is more environmentally friendly .

However, despite being water-soluble, PVA can persist in the environment and is now commonly found in wastewater. When released into waterways, PVA can cause foaming that reduces oxygen available to aquatic life and can absorb harmful pollutants like antibiotics and heavy metals, which then accumulate up the food chain (source).

The amount of PVA used in the world amplifies the problem. Globally, the production of PVA amounts to about 650,000 tons a year, and its use is steadily growing. So, while PVA may initially be less toxic than PVC for humans, its widespread environmental impact, especially in aquatic ecosystems, needs further study and careful management (source).

What Products Have Polyvinyl Alcohol?

Polyvinyl alcohol is common in products you may have never imagined! Take a look:

• dish and laundry detergent films
• textile production
• paints
• glues
• paper coatings
• skincare masks
• 3D printing
• food and beverage packaging barriers
• reinforcing agent in the concrete 
• wound dressings
• drug delivery
• several biomedical applications (source, source, and source).

Conclusion: Is Polyvinyl Safe?

Common Polyvinyl Plastics Include Polyvinyl Chloride (PVC) And Polyvinyl Alcohol (PVA). While PVA Is Generally Less Harmful, Both Plastics Can Potentially Negatively Impact Human Health And The Environment.

In conclusion, understanding the difference between polyvinyl chloride and polyvinyl alcohol empowers you to make more informed choices for your home and family. While both are synthetic polymers, PVC’s chlorine content and frequent use of additives like plasticizers and heavy metals make it a greater concern for health and environmental safety, particularly in flexible products or those that contact food and drinking water.

On the other hand, PVA is chlorine-free and water-soluble, often considered a safer alternative. However, its widespread use has introduced new environmental challenges, especially as a common pollutant in waterways and food chains.

When shopping, take note of PVC’s potential to introduce unwanted chemicals, while recognizing that PVA also carries environmental trade-offs. By staying mindful of these differences and considering alternatives, you can reduce exposure to questionable substances and contribute to a healthier, non-toxic home.

In my case, replacing most vinyl products with safer options has brought peace of mind that my choices support both my family’s well-being and the environment.

For more on making healthy plastic choices, see my thoughts on BPA-Free Water Bottles and learn the science behind the question Are Plastic Water Bottles Safe?.

Browse the I Read Labels For You blog for the latest on products and ingredients, visit my non-toxic shop, and opt to get my free emails for inspiration, discounts, and much more!