![]() ![]() This type of polymer is both the simplest of all commercial polymers and the most popular type of plastic in the world. Polyethylene is considered food-safe and is an effective way to truly waterproof a change pad. Naturepedic, for instance, use polyethylene for the waterproof cover on their organic cotton change pad. Your best bet for a green and non-toxic change pad is a polyurethane-free change pad with a wipe-clean, food-grade polyethylene cover. What about polyethylene covered change pads? If you’re faced with a choice between polyurethane, PVC, and TPU, TPU is probably your best option for a waterproof change pad. Different types of plastic have different levels of toxicity for human health and the environment. Plastic is currently the only viable way to completely waterproof a change pad, but not all plastic is the same. As with polyurethane, burning TPU produces irritant toxic fumes, meaning that any change pad made with TPU will probably have been treated with flame retardants. Also, other chemicals may be added to TPU which could compromise its safety, and the degradation of TPU may produce unsafe degradation products, including toxic gases and dust. If there are monomers and catalysts left over from the polymerization reaction(s) and other processes used to create TPU, there’s a chance that these could pose a risk of toxicity. This is also why it’s used in many disposable diapers and cloth diaper covers for the waterproof outer layer. TPU is, in fact, used in biomedical applications and is considered an inert material, depending on exactly how it was created. ![]() In general, TPU could be considered less toxic than polyurethane, given that it doesn’t contain problematic isocyanates and polyols. TPU is made from polyether, polyester, or polycaprolactones, while polyurethane is made from polyols and isocyanates. Compared to PVC and polyurethane, TPU is less likely to degrade and crack, meaning that the waterproof covering of a change pad will stay waterproof for longer. TPU is similar to polyurethane, but is more water resistant, does not contain crosslinks, and has hard and soft segments that make it more durable, elastic, and resistant to stretching and stains than polyurethane. Of these, TPU is arguably the least troublesome, as we saw in last week’s look at toxic chemicals in crib mattresses. Most change pads are made with polyurethane foam and a PVC cover or TPU (thermoplastic polyurethane) cover. #Changing pad snap converter free#
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