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During a recent introduction to FreeCAD workshop that I teach at The Edge, I got asked an awesome question that actually had me a little stumped: 'Is Polyvinyl Alcohol the same as what is in PVA glue?'
You see, I was giving a little bit of a run down on the different materials that can be used in Fused Deposition 3D printers (aka RepRap and Makerbot). I was telling everyone about the wonders of PVA or Polyvinyl Alcohol. A water soluble plastic that is awesome for printing support structures or scaffolding. When you are done, just throw it in a tub of water and your scaffolding dissolves away - just leaving you with your desired object.
So is the above Polyvinyl Alcohol the same as what you find in PVA glue? Nope! It turns out PVA glue is actually PVAc, or Polyvinyl Acetate. You can however turn PVA glue into the cool plastic above by dissolving it in [Alcohol and treating it with sodium hydroxide](https://www.britannica.com/EBchecked/topic//polyvinyl-alcohol- PVA). So, just when you thought PVA glue couldn't be any more awesome and useful, you find out that it can be turned into an awesome material for 3D printers.
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Whether we're doing laundry or running a dishwasher, most of us are familiar with detergent products that come in a pod. In this post, we'll look at the material used to make these pods, polyvinyl alcohol.
Polyvinyl alcohol (PVA) is a water-soluble synthetic polymer, and we encounter it in various applications, from glue to medications to food packaging to pods (1).
We've become more familiar with this ingredient in recent years. We've seen more companies use PVA's unique sturdy yet water-soluble properties to package concentrated cleaning products in an easy-to-use pod.
However, it's not just safe to use for cleaning purposes. PVA is approved safe by the FDA for food packaging, is considered a GRAS ingredient by the FDA, and has biomedical and pharmaceutical applications as well (1,2,3).
Sub-chronic toxicity and genotoxicity studies confirm that PVA is safe for humans when exposed via numerous exposure pathways in typical daily exposure (1,2).
However, the ingredients inside the PVA encasement are often not as safe. Pods made from PVA may contain highly concentrated detergents that can cause harm if consumed or exposed to our skin. It's vital to keep these out of children's reach.
Research supports that PVA does not negatively impact environmental health when water treatment facilities are available. Water treatment facilities contain the correct microbes to break down the material completely (1,2).
Using detergent pods can have a positive impact on the environment as less water is used in the detergent, thus saving water and weight. When the product weighs less, it reduces transportation energy needs helping to offset environmental costs.
There are many uses for PVAs beyond containing detergents.
We've seen PVA used in medical settings tested as soft contact lens material, artificial heart linings, artificial cartilages, catheters, skin, and pancreas membranes (1).
Pharmacologists have explored using PVA as drug delivery systems to distribute medications through various routes effectively. They've also harnessed the film-forming and adhesion properties in body washes, multipurpose creams, and sunscreens (1,2).
Researchers and manufacturers continue to explore the potential uses of PVA to keep foods safe. We see PVA in food packaging and commonly used as capsules for dietary supplements. It's safe to consume in normal quantities, and the FDA recognizes it as a GRAS ingredient (1).
We don't always have to sacrifice what's easy for what safe for our health and best for the environment. PVA ingredients are an excellent example of an ingredient positively transforming industries.
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